School of Particles and Accelerators
Special Seminar / Virtual Format
Date:
Sunday, Aug 11, 2024 / یکشنبه، 21 مرداد 1403
Time:
14:30 PM (Tehran time)
Speaker:
Dr. Jahed Abedi
Affiliation:
University of Stavanger
Title:
Search for echoes on the edge of quantum black holes
Title in Persian:
جستجو برای پژواکها در لبه سیاهچالههای کوانتومی
Abstract:
I perform a template-based search for stimulated emission of Hawking radiation (or Boltzmann echoes) by combining the gravitational wave data from 47 binary black hole merger events observed by the LIGO/Virgo collaboration. With a Bayesian inference approach, I found no statistically significant evidence for this signal in either of the 3 Gravitational Wave Transient Catalogs GWTC-1, GWTC-2 and GWTC-3. However, the data cannot yet conclusively rule out the presence of Boltzmann echoes either, with the Bayesian evidence ranging within 0.3-1.6 for most events, and a common (non-vanishing) echo amplitude for all mergers being disfavoured at only 2:5 odds. The only exception is GW190521, the most massive and confidently detected event ever observed, which shows a positive evidence of 9.2 for stimulated Hawking radiation. The ''look-elsewhere'' effect for this outlier event is assessed by applying two distinct methods to add simulated signals in real data, before and after the event, giving false (true) positive detection probabilities for higher Bayes factors of 1.5%, 4.4% (35 ± 7 %, 35 ± 15 %). An optimal combination of posteriors yields an upper limit of A < 0.4 (at 90% confidence level) for a universal echo amplitude, whereas A ~1 was predicted in the canonical model. To ensure the robustness of the results, I have employed an additional method to combine the events hierarchically. This approach involves using a target gaussian distribution and extracting the parameters from multiple uncertain observations, which may be affected by selection biases. The next generation of gravitational wave detectors such as LISA, Einstein Telescope, and Cosmic Explorer can draw a better conclusion on the quantum nature of black hole horizons.
Link to Join Virtually: https://www.skyroom.online/ch/ipm-particles/seminar
Special Seminar / Virtual Format
Date:
Sunday, Aug 11, 2024 / یکشنبه، 21 مرداد 1403
Time:
14:30 PM (Tehran time)
Speaker:
Dr. Jahed Abedi
Affiliation:
University of Stavanger
Title:
Search for echoes on the edge of quantum black holes
Title in Persian:
جستجو برای پژواکها در لبه سیاهچالههای کوانتومی
Abstract:
I perform a template-based search for stimulated emission of Hawking radiation (or Boltzmann echoes) by combining the gravitational wave data from 47 binary black hole merger events observed by the LIGO/Virgo collaboration. With a Bayesian inference approach, I found no statistically significant evidence for this signal in either of the 3 Gravitational Wave Transient Catalogs GWTC-1, GWTC-2 and GWTC-3. However, the data cannot yet conclusively rule out the presence of Boltzmann echoes either, with the Bayesian evidence ranging within 0.3-1.6 for most events, and a common (non-vanishing) echo amplitude for all mergers being disfavoured at only 2:5 odds. The only exception is GW190521, the most massive and confidently detected event ever observed, which shows a positive evidence of 9.2 for stimulated Hawking radiation. The ''look-elsewhere'' effect for this outlier event is assessed by applying two distinct methods to add simulated signals in real data, before and after the event, giving false (true) positive detection probabilities for higher Bayes factors of 1.5%, 4.4% (35 ± 7 %, 35 ± 15 %). An optimal combination of posteriors yields an upper limit of A < 0.4 (at 90% confidence level) for a universal echo amplitude, whereas A ~1 was predicted in the canonical model. To ensure the robustness of the results, I have employed an additional method to combine the events hierarchically. This approach involves using a target gaussian distribution and extracting the parameters from multiple uncertain observations, which may be affected by selection biases. The next generation of gravitational wave detectors such as LISA, Einstein Telescope, and Cosmic Explorer can draw a better conclusion on the quantum nature of black hole horizons.
Link to Join Virtually: https://www.skyroom.online/ch/ipm-particles/seminar
🇦🇺 PhD Opportunities in Astronomy & Radio Astronomy Engineering at the International Centre for Radio Astronomy Research (ICRAR), Curtin University node 🇦🇺
We invite well-qualified students of any nationality to apply to the PhD program at the Curtin Institute of Radio Astronomy (CIRA), based at Curtin University in Perth, Australia. This program focuses on radio astronomy and radio astronomy engineering in support of the Square Kilometre Array (SKA). We have a wide range of potential PhD projects to choose from (nominally for three years with a possible six-month extension).
CIRA forms one half of the International Centre for Radio Astronomy Research (ICRAR), a joint venture between Curtin University and The University of Western Australia, supported by the Western Australian Government. CIRA operates the Murchison Widefield Array (MWA), the precursor to the low frequency component of the SKA, and supports a large research group spanning Galactic and extragalactic radio astronomy, pulsars, accretion physics, studies of the Epoch of Reionisation (EoR), and radio astronomy engineering research, including significant participation in developing systems (hardware and software) for the SKA. Construction of the SKA began last year and CIRA has close connections with the SKA Observatory and the Australian SKA Regional Centre. Perth has a vibrant astronomy community with astronomers from four different institutes working closely together.
Compensation and Benefits
Compensation Type
Salary
Currency
323
Stipend
$42,000.00AUD
Included Benefits
The total annual scholarship package (stipend and tuition fees) is approx. $70,000 AUD p.a. The stipend is valued at approx. $42,000 AUD p.a.
Link to Online Application
https://astronomy.curtin.edu.au/study-with-cira/projects-for-international-and-…
Publication Start Date
2024 Jul 02
Application Deadline
2024 Aug 18
We invite well-qualified students of any nationality to apply to the PhD program at the Curtin Institute of Radio Astronomy (CIRA), based at Curtin University in Perth, Australia. This program focuses on radio astronomy and radio astronomy engineering in support of the Square Kilometre Array (SKA). We have a wide range of potential PhD projects to choose from (nominally for three years with a possible six-month extension).
CIRA forms one half of the International Centre for Radio Astronomy Research (ICRAR), a joint venture between Curtin University and The University of Western Australia, supported by the Western Australian Government. CIRA operates the Murchison Widefield Array (MWA), the precursor to the low frequency component of the SKA, and supports a large research group spanning Galactic and extragalactic radio astronomy, pulsars, accretion physics, studies of the Epoch of Reionisation (EoR), and radio astronomy engineering research, including significant participation in developing systems (hardware and software) for the SKA. Construction of the SKA began last year and CIRA has close connections with the SKA Observatory and the Australian SKA Regional Centre. Perth has a vibrant astronomy community with astronomers from four different institutes working closely together.
Compensation and Benefits
Compensation Type
Salary
Currency
323
Stipend
$42,000.00AUD
Included Benefits
The total annual scholarship package (stipend and tuition fees) is approx. $70,000 AUD p.a. The stipend is valued at approx. $42,000 AUD p.a.
Link to Online Application
https://astronomy.curtin.edu.au/study-with-cira/projects-for-international-and-…
Publication Start Date
2024 Jul 02
Application Deadline
2024 Aug 18
Curtin Institute of Radio Astronomy
Projects for International and Domestic students: - Curtin Institute of Radio Astronomy
AVAILABILITY PROJECT SUPERVISOR STATUS International and Domestic Probing the First Galaxies via Neutral Hydrogen Nick Seymour APPLY HERE International and Domestic From Observation to Mitigation: Leveraging LSST, the Global Fireball Observatory, and DREAMS…
Institute for Research in Fundamental Sciences (IPM)
SoA Virtual Seminar
Impact of AGN feedback on the dynamics of gas; A Review Across Diverse Environments
Mojtaba Raouf Hajar Zarrin
(Leiden Observatory, Netherlands)
Abstract:
We examine the relationship between black hole activity and kinematic gas-star misalignment in different galaxies. In the case of brightest group galaxies (BGGs), the formation history of galaxy groups is assessed through "age-dating" as an indicator of distinct major mergers involving the BGG. BGGs within groups characterized by a higher frequency of major mergers are more likely to host active supermassive black holes (SMBHs). A consistent correlation is identified between the level of black hole activity, as indicated by the 1.4 GHz and 325 MHz radio emissions, and the degree of kinematic misalignment between the gas and stellar components in BGGs. In dynamically "fossil" groups, where black hole accretion rate is relatively (~ 1 dex) lower due to the lack of recent (≤ 1 Gyr) major mergers, there is reduced (~ 30%) misalignment between the gas and stellar components of BGGs compared to non-fossil groups. Through examining the smaller-scale properties and dynamics of the gas disc influenced by mechanical AGN feedback, hydrodynamic simulations (HDGAS) suggest that AGN wind-induced effects further lead to persistent gas misalignment of the disk around the supermassive black hole, independent of environmental impacts.
سه شنبه 23 ماه امرداد 1403 ساعت 13:30
Tuesday 13 August 2024-Tehran Time 13:30
To join the seminar, please click on the following link
https://www.skyroom.online/ch/soa/weekly-seminar
SoA Virtual Seminar
Impact of AGN feedback on the dynamics of gas; A Review Across Diverse Environments
Mojtaba Raouf Hajar Zarrin
(Leiden Observatory, Netherlands)
Abstract:
We examine the relationship between black hole activity and kinematic gas-star misalignment in different galaxies. In the case of brightest group galaxies (BGGs), the formation history of galaxy groups is assessed through "age-dating" as an indicator of distinct major mergers involving the BGG. BGGs within groups characterized by a higher frequency of major mergers are more likely to host active supermassive black holes (SMBHs). A consistent correlation is identified between the level of black hole activity, as indicated by the 1.4 GHz and 325 MHz radio emissions, and the degree of kinematic misalignment between the gas and stellar components in BGGs. In dynamically "fossil" groups, where black hole accretion rate is relatively (~ 1 dex) lower due to the lack of recent (≤ 1 Gyr) major mergers, there is reduced (~ 30%) misalignment between the gas and stellar components of BGGs compared to non-fossil groups. Through examining the smaller-scale properties and dynamics of the gas disc influenced by mechanical AGN feedback, hydrodynamic simulations (HDGAS) suggest that AGN wind-induced effects further lead to persistent gas misalignment of the disk around the supermassive black hole, independent of environmental impacts.
سه شنبه 23 ماه امرداد 1403 ساعت 13:30
Tuesday 13 August 2024-Tehran Time 13:30
To join the seminar, please click on the following link
https://www.skyroom.online/ch/soa/weekly-seminar
www.skyroom.online
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🇬🇧🇺🇸 NEW COLLEGE OXFORD - JOHNS HOPKINS CENTRE FOR COSMOLOGICAL STUDIES 🇺🇸🇬🇧
FUNDING FOR POSTDOC/POSTGRAD TRAVEL TO OXFORD, IAP AND JHU
These grants are intended to support travel by postdocs, research fellows and final year postgrads to work with a wide range of staff at Oxford, the Institut d’Astrophysique in Paris, and at Johns Hopkins in Baltimore. Travel to Paris or Baltimore can be for trips of duration ranging from 2 weeks to 2 months. Applications are welcome from anyone whose work is connected to cosmology in a very broad sense.
Visits to Oxford are intended to cover the substantial part of a term, normally 6-8 weeks, and include visiting membership of the New College Senior Common Room.
Typical awards cover flights, accommodation and a substantial contribution to living costs.
Full details can be found on the Centre’s website at https://balzan.new.ox.ac.uk/
Deadline: 23rd August 2024 (Applications require only a short research proposal.)
FUNDING FOR POSTDOC/POSTGRAD TRAVEL TO OXFORD, IAP AND JHU
These grants are intended to support travel by postdocs, research fellows and final year postgrads to work with a wide range of staff at Oxford, the Institut d’Astrophysique in Paris, and at Johns Hopkins in Baltimore. Travel to Paris or Baltimore can be for trips of duration ranging from 2 weeks to 2 months. Applications are welcome from anyone whose work is connected to cosmology in a very broad sense.
Visits to Oxford are intended to cover the substantial part of a term, normally 6-8 weeks, and include visiting membership of the New College Senior Common Room.
Typical awards cover flights, accommodation and a substantial contribution to living costs.
Full details can be found on the Centre’s website at https://balzan.new.ox.ac.uk/
Deadline: 23rd August 2024 (Applications require only a short research proposal.)
School of Physics: HEPCo Weekly Seminar Series
Speaker
Mohanna Shams
Affiliation
Institute for advanced studies in basic sciences (IASBS)
Title of talk
2D Bi-Scalar Gravity from 4D Horndeski Theory
گرانش دو-اسکالر دو-بعدی منتج شده از نظریه ی هورندسکی چهار بعدی
Date and time
Tuesday, August 13th, 2024 (Mordad 23rd, 1403), 3:00 pm (Tehran zone)
Link
https://www.skyroom.online/ch/schoolofphysics/highenergyseminar
Abstract
In this talk, I will present aspects of 2D scalar-tensor theories. First, I will construct a 2D bi-scalar gravity from a 4D Horndeski theory using a Kaluza-Klein (KK) dimensional reduction on a 2-sphere. I will then provide some identities to write the action in a more compact form and use these to develop a more generalized 2D bi-scalar theory. Following this, I will use the KK reduction process to map 4D Horndeski solutions to 2D bi-scalar theory solutions.
In the second half of the talk, I will explore the single-scalar version of the 2D bi-scalar gravity. I will discuss how some important 2D single-scalar theories may have a 4D origin. I will then investigate the relationship between some key 2D single-scalar tensor theories, explaining how the 2D Horndeski theory and GRZ model can be derived from JT gravity using disformal transformation.
Speaker
Mohanna Shams
Affiliation
Institute for advanced studies in basic sciences (IASBS)
Title of talk
2D Bi-Scalar Gravity from 4D Horndeski Theory
گرانش دو-اسکالر دو-بعدی منتج شده از نظریه ی هورندسکی چهار بعدی
Date and time
Tuesday, August 13th, 2024 (Mordad 23rd, 1403), 3:00 pm (Tehran zone)
Link
https://www.skyroom.online/ch/schoolofphysics/highenergyseminar
Abstract
In this talk, I will present aspects of 2D scalar-tensor theories. First, I will construct a 2D bi-scalar gravity from a 4D Horndeski theory using a Kaluza-Klein (KK) dimensional reduction on a 2-sphere. I will then provide some identities to write the action in a more compact form and use these to develop a more generalized 2D bi-scalar theory. Following this, I will use the KK reduction process to map 4D Horndeski solutions to 2D bi-scalar theory solutions.
In the second half of the talk, I will explore the single-scalar version of the 2D bi-scalar gravity. I will discuss how some important 2D single-scalar theories may have a 4D origin. I will then investigate the relationship between some key 2D single-scalar tensor theories, explaining how the 2D Horndeski theory and GRZ model can be derived from JT gravity using disformal transformation.
www.skyroom.online
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🇮🇹 The PhD School in Physics of the Physics Department of the University of Pisa announces the opening of a PhD position in "Theoretical methods for detecting new physics signals” 🇮🇹
The duration of the PhD in Physics is 3 years. Admissions are via evaluation of the curriculum and an interview. Selected candidates receive a scholarship to cover their living expenses. PhD students attend advanced courses and participate to workshops, conferences and PhD schools. Under the guidance of a personal supervisor, PhD students learn how to carry on research at international level which leads to the writing up of a PhD thesis. The PhD programme is completed successfully after passing a final exam.
Informations about the research activity of the Theoretical Physics Department can be found at:
https://sites.google.com/a/unipi.it/pisa-theory-group/
The official announcement with instructions about how to apply and information about the available PhD positions can be found at:
https://dottorato.unipi.it/index.php/en/application-process-for-the-academic-year-2024-2025/item/874.html
https://dottorato.unipi.it/index.php/en/application-process-for-the-academic-year-2023-2024/item/766.html
and
https://dottorato.unipi.it/images/stories/competition2024_2025/concorsi_c_eng/fisica04_c_eng.pdf
A practical guide to fill the application online can be found at:
https://dottorato.unipi.it/images/stories/competition2024_2025/documents/guide40b_eng.pdf
The deadline is 22 June at 13:00 (CEST)
Contact: D'Elia, Massimo (massimo.delia@unipi.it)
The duration of the PhD in Physics is 3 years. Admissions are via evaluation of the curriculum and an interview. Selected candidates receive a scholarship to cover their living expenses. PhD students attend advanced courses and participate to workshops, conferences and PhD schools. Under the guidance of a personal supervisor, PhD students learn how to carry on research at international level which leads to the writing up of a PhD thesis. The PhD programme is completed successfully after passing a final exam.
Informations about the research activity of the Theoretical Physics Department can be found at:
https://sites.google.com/a/unipi.it/pisa-theory-group/
The official announcement with instructions about how to apply and information about the available PhD positions can be found at:
https://dottorato.unipi.it/index.php/en/application-process-for-the-academic-year-2024-2025/item/874.html
https://dottorato.unipi.it/index.php/en/application-process-for-the-academic-year-2023-2024/item/766.html
and
https://dottorato.unipi.it/images/stories/competition2024_2025/concorsi_c_eng/fisica04_c_eng.pdf
A practical guide to fill the application online can be found at:
https://dottorato.unipi.it/images/stories/competition2024_2025/documents/guide40b_eng.pdf
The deadline is 22 June at 13:00 (CEST)
Contact: D'Elia, Massimo (massimo.delia@unipi.it)
Google
Pisa Theory Group
Welcome! This is the web page of the Theoretical Physics Group at the
Physics Department, Pisa University and INFN, Pisa Division.
Here you can find information about our group members and research activity.
Physics Department, Pisa University and INFN, Pisa Division.
Here you can find information about our group members and research activity.
✳️ دانشمندان اولین مطالعه غیر خطی مربوط به شبیه ساز های سیاهچاله ها را انجام دادند ✳️
لینک گزارش
@PDATLAB
لینک گزارش
@PDATLAB
phys.org
Scientist performs the first nonlinear study of black hole mimickers
In recent research, a scientist from Princeton University has performed the first nonlinear study of the merger of a black hole mimicker, aiming to understand the nature of gravitational wave signals ...
School of Physics: HEPCo Weekly Seminar Series
Speaker
Niloofar Vardian
Affiliation
SISSA
Title of talk
Bulk Reconstruction: Explicit Entanglement Wedge Reconstruction via Petz Map
بازسازی صریح ناحیه درهمتنیدگی توسط نگاشت پتز
Date and time
Tuesday, August 20th, 2024 (Mordad 30th, 1403), 2:00 pm (Tehran zone)
Link
https://www.skyroom.online/ch/schoolofphysics/highenergyseminar
Abstract
We revisit entanglement wedge reconstruction in AdS/CFT using the Petz recovery channel. In the case of a spherical region on the boundary, we show that the Petz map reproduces the AdS-Rindler HKLL reconstruction. Moreover, for a generic subregion of the boundary, we could obtain the same boundary representation of a local bulk field lies in the entanglement wedge as the one proposed earlier in JLMS paper using properties of the modular flow.
Speaker
Niloofar Vardian
Affiliation
SISSA
Title of talk
Bulk Reconstruction: Explicit Entanglement Wedge Reconstruction via Petz Map
بازسازی صریح ناحیه درهمتنیدگی توسط نگاشت پتز
Date and time
Tuesday, August 20th, 2024 (Mordad 30th, 1403), 2:00 pm (Tehran zone)
Link
https://www.skyroom.online/ch/schoolofphysics/highenergyseminar
Abstract
We revisit entanglement wedge reconstruction in AdS/CFT using the Petz recovery channel. In the case of a spherical region on the boundary, we show that the Petz map reproduces the AdS-Rindler HKLL reconstruction. Moreover, for a generic subregion of the boundary, we could obtain the same boundary representation of a local bulk field lies in the entanglement wedge as the one proposed earlier in JLMS paper using properties of the modular flow.
www.skyroom.online
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با سلام و عرض احترام،
روز شنبه ۲۷ مرداد ماه (فردا)، ساعت ۱۰-۱۲ صبح، در فضای مجازی سخنرانی و گپ و گفتی با عنوان «زنان تاثیرگذار در فیزیک ذرات» خواهیم داشت. طبعا سخنرانی را با یادی از خانواده کوری ها آغاز خواهیم کرد. سپس یادی از امی نوتر خواهیم نمود. از ماریا گوپرت مایر یاد کرده، به آزمایش «وو» خواهیم پرداخت. با توجه به این که هفته گذشته، تی-دی-لی جان به جان آفرین تسلیم کرد، به سهم ایشان به همراه سی-ان-ینگ در کشف نقض پاریته نیزاشاره خواهیم کرد. سپس به میلا بالدو و دستاوردهای علمی او و نیز دستاوردهای همنسلان او برای حقوق زنان خواهیم پرداخت.
در خلال بحث ها، به نکات و کلیشه هایی خواهیم پرداخت که زنان و مردان در جامعه دانشگاهی ایران-به خصوص در جامعه فیزیک ایران- با آنها درگیرند. امیدواریم با ایجاد هشیاری در این زمینه زنان و مردان جوان را که قدم در راه مسیر طولانی کارهای پژوهشی نهاده اند از درگیر شدن با حاشیه های بی ثمر باز داریم.
از کلیه خانم ها و آقای علاقه مند به این گونه بحث ها دعوت می نمایم که در این جلسه شرکت کنند. پوستر برنامه در پیوست موجود است.
لینک شرکت در برنامه:
https://www.skyroom.online/ch/schoolofphysics/colloquium
به امید دیدار
یاسمن فرزان
روز شنبه ۲۷ مرداد ماه (فردا)، ساعت ۱۰-۱۲ صبح، در فضای مجازی سخنرانی و گپ و گفتی با عنوان «زنان تاثیرگذار در فیزیک ذرات» خواهیم داشت. طبعا سخنرانی را با یادی از خانواده کوری ها آغاز خواهیم کرد. سپس یادی از امی نوتر خواهیم نمود. از ماریا گوپرت مایر یاد کرده، به آزمایش «وو» خواهیم پرداخت. با توجه به این که هفته گذشته، تی-دی-لی جان به جان آفرین تسلیم کرد، به سهم ایشان به همراه سی-ان-ینگ در کشف نقض پاریته نیزاشاره خواهیم کرد. سپس به میلا بالدو و دستاوردهای علمی او و نیز دستاوردهای همنسلان او برای حقوق زنان خواهیم پرداخت.
در خلال بحث ها، به نکات و کلیشه هایی خواهیم پرداخت که زنان و مردان در جامعه دانشگاهی ایران-به خصوص در جامعه فیزیک ایران- با آنها درگیرند. امیدواریم با ایجاد هشیاری در این زمینه زنان و مردان جوان را که قدم در راه مسیر طولانی کارهای پژوهشی نهاده اند از درگیر شدن با حاشیه های بی ثمر باز داریم.
از کلیه خانم ها و آقای علاقه مند به این گونه بحث ها دعوت می نمایم که در این جلسه شرکت کنند. پوستر برنامه در پیوست موجود است.
لینک شرکت در برنامه:
https://www.skyroom.online/ch/schoolofphysics/colloquium
به امید دیدار
یاسمن فرزان
www.skyroom.online
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Forwarded from UT.Physics.Seminars
برنامه روزی با دانشکده فیزیک دانشگاه تهران
برای علاقمندان به علم و فیزیک
امکان بازدید از دانشکده و آزمایشگاه ها و موزه فیزیک ایران
سه شنبه ۳۰ مرداد ۱۴۰۳
@UTPhysicsWeeklySeminars
برای علاقمندان به علم و فیزیک
امکان بازدید از دانشکده و آزمایشگاه ها و موزه فیزیک ایران
سه شنبه ۳۰ مرداد ۱۴۰۳
@UTPhysicsWeeklySeminars
Forwarded from انجمن علمی فيزيک دانشگاه تهران
(سهشنبه این هفته، ۳۰ مرداد ۱۴۰۳)
https://survey.porsline.ir/s/ajrUZdKX
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روزی با دانشکده فیزیک دانشگاه تهران ۱۴۰۳
با پُرسلاین به راحتی پرسشنامه خود را طراحی و ارسال کنید و با گزارشهای لحظهای آن به سرعت تصمیم بگیرید.
School of Particles and Accelerators
Journal Club: Experiments & Phenomenology / Hybrid Format
Date:
Monday, Aug 26, 2024 / دوشنبه، 5 شهریور 1403
Time:
11:00 AM - 12:00 PM (Tehran time)
Speaker:
Dr. Behnaz Behzadmoghaddam
Affiliation:
School of Particles and Accelerators, IPM
Title:
The Two-Nucleon 1S0 Amplitude Zero in Chiral Effective Field Theory
Title in Persian:
صفر دامنه ی دو نوکلئونی 1S0 در نظریه ی میدان موثر کایرال
Abstract:
Recently, a new rearrangement of short-range interactions has been suggested in the 1S0 nucleon-nucleon channel within Chiral Effective Field Theory. This is intended to reproduce the amplitude zero at leading order, and it includes subleading corrections perturbatively in a way that is consistent with renormalization-group invariance. Systematic improvement is shown at next-to-leading order, the obtained results have been fitted empirical phase shifts remarkably well all the way up to the pion-production threshold. An approach in which pions have been integrated out is included, which allows us to present analytic results that also fit phenomenology surprisingly well.
Based on: https://doi.org/10.48550/arXiv.1704.08524
Meeting Place: Seminar Room, School of Particles and Accelerators, IPM
Link to Join Virtually: https://meet.google.com/bda-vsem-tuv
Journal Club: Experiments & Phenomenology / Hybrid Format
Date:
Monday, Aug 26, 2024 / دوشنبه، 5 شهریور 1403
Time:
11:00 AM - 12:00 PM (Tehran time)
Speaker:
Dr. Behnaz Behzadmoghaddam
Affiliation:
School of Particles and Accelerators, IPM
Title:
The Two-Nucleon 1S0 Amplitude Zero in Chiral Effective Field Theory
Title in Persian:
صفر دامنه ی دو نوکلئونی 1S0 در نظریه ی میدان موثر کایرال
Abstract:
Recently, a new rearrangement of short-range interactions has been suggested in the 1S0 nucleon-nucleon channel within Chiral Effective Field Theory. This is intended to reproduce the amplitude zero at leading order, and it includes subleading corrections perturbatively in a way that is consistent with renormalization-group invariance. Systematic improvement is shown at next-to-leading order, the obtained results have been fitted empirical phase shifts remarkably well all the way up to the pion-production threshold. An approach in which pions have been integrated out is included, which allows us to present analytic results that also fit phenomenology surprisingly well.
Based on: https://doi.org/10.48550/arXiv.1704.08524
Meeting Place: Seminar Room, School of Particles and Accelerators, IPM
Link to Join Virtually: https://meet.google.com/bda-vsem-tuv
arXiv.org
The Two-Nucleon 1S0 Amplitude Zero in Chiral Effective Field Theory
We present a new rearrangement of short-range interactions in the $^1S_0$ nucleon-nucleon channel within Chiral Effective Field Theory. This is intended to reproduce the amplitude zero (scattering...
🇨🇱 PhD and MSc Positions in Observational, Theoretical, and/or Computational Astrophysics and Instrumentation 🇨🇱
The Department of Astronomy (DAS) at Universidad de Chile invites applications for Masters and Doctoral positions in observational, theoretical, and/or computational astrophysics and instrumentation. Selected candidates will be awarded 4 years of funding to cover their doctoral graduate studies, and are expected to start in March 2025. Successful applicants will attend graduate classes, colloquia, and pursue cutting-edge research projects as part of their training. Graduate students are eligible to apply for the guaranteed-time available to Chilean institutions on all telescope facilities in the country. The Astronomy Department is committed to equity and diversity and encourages applications from all qualified candidates.
The following materials are required as part of the application process:
a. A short Motivation Letter.
b. Curriculum Vitae.
c. Copies of your academic trannoscript, your undergraduate syllabus, and degree award.
d. Two letters of recommendation.
Programs are conducted in English. Please send any questions of queries to Ms. Marta Ojeda, postgrado@das.uchile.cl.
PhD: https://ucampus.uchile.cl/m/fcfm_postgrado_postulacion/ficha_postulacion?carr_codigo=143
MSc: https://ucampus.uchile.cl/m/fcfm_postgrado_postulacion/ficha_postulacion?carr_codigo=142
The Department of Astronomy (DAS) at Universidad de Chile invites applications for Masters and Doctoral positions in observational, theoretical, and/or computational astrophysics and instrumentation. Selected candidates will be awarded 4 years of funding to cover their doctoral graduate studies, and are expected to start in March 2025. Successful applicants will attend graduate classes, colloquia, and pursue cutting-edge research projects as part of their training. Graduate students are eligible to apply for the guaranteed-time available to Chilean institutions on all telescope facilities in the country. The Astronomy Department is committed to equity and diversity and encourages applications from all qualified candidates.
The following materials are required as part of the application process:
a. A short Motivation Letter.
b. Curriculum Vitae.
c. Copies of your academic trannoscript, your undergraduate syllabus, and degree award.
d. Two letters of recommendation.
Programs are conducted in English. Please send any questions of queries to Ms. Marta Ojeda, postgrado@das.uchile.cl.
PhD: https://ucampus.uchile.cl/m/fcfm_postgrado_postulacion/ficha_postulacion?carr_codigo=143
MSc: https://ucampus.uchile.cl/m/fcfm_postgrado_postulacion/ficha_postulacion?carr_codigo=142
School of Particles and Accelerators
Wednesday Weekly Seminar – Virtual Format
Date:
Wednesday, Aug 28, 2024 / چهارشنبه، 7 شهریور 1403
Time:
11:00 AM - 12:00 PM (Tehran time)
Speaker:
Dr. Saeed Ansarifard
Affiliation:
School of Physics, IPM
Title:
Solar neutrinos and leptonic spin forces
Title in Persian:
نیروهای اسپین لپتونی و نوترینوهای خورشیدی
Abstract:
In this talk, I quantify the effects of light spin-zero particles with pseudoscalar couplings to leptons and scalar couplings to nucleons on the evolution of solar neutrinos. I show in this scenario the matter potential sourced by the nucleons in the Sun’s matter gives rise to spin precession of the relativistic neutrino ensemble. For Dirac neutrinos, the spin-flavour precession results in active-sterile oscillations, while for Majorana neutrinos it results in left-handed neutrino to right-handed antineutrino oscillations. In both cases, this leads to distortions in the solar neutrino spectrum which we use to derive constraints on the allowed values of the mediator mass and couplings via a global analysis of the solar neutrino data. In addition for Majorana neutrinos, spin-flavour precession results into a potentially observable flux of solar electron antineutrinos at the Earth which we quantify and constrain with the existing bounds from Borexino and KamLAND.
Indico Link: https://indico.hep.ipm.ir/e/s.ansarifard1
Link to Join Virtually: https://meet.google.com/bda-vsem-tuv
Wednesday Weekly Seminar – Virtual Format
Date:
Wednesday, Aug 28, 2024 / چهارشنبه، 7 شهریور 1403
Time:
11:00 AM - 12:00 PM (Tehran time)
Speaker:
Dr. Saeed Ansarifard
Affiliation:
School of Physics, IPM
Title:
Solar neutrinos and leptonic spin forces
Title in Persian:
نیروهای اسپین لپتونی و نوترینوهای خورشیدی
Abstract:
In this talk, I quantify the effects of light spin-zero particles with pseudoscalar couplings to leptons and scalar couplings to nucleons on the evolution of solar neutrinos. I show in this scenario the matter potential sourced by the nucleons in the Sun’s matter gives rise to spin precession of the relativistic neutrino ensemble. For Dirac neutrinos, the spin-flavour precession results in active-sterile oscillations, while for Majorana neutrinos it results in left-handed neutrino to right-handed antineutrino oscillations. In both cases, this leads to distortions in the solar neutrino spectrum which we use to derive constraints on the allowed values of the mediator mass and couplings via a global analysis of the solar neutrino data. In addition for Majorana neutrinos, spin-flavour precession results into a potentially observable flux of solar electron antineutrinos at the Earth which we quantify and constrain with the existing bounds from Borexino and KamLAND.
Indico Link: https://indico.hep.ipm.ir/e/s.ansarifard1
Link to Join Virtually: https://meet.google.com/bda-vsem-tuv
Indico
Wednesday weekly meeting
Weekly general meeting of the school of particles and accelerators (virtual) Link to join: https://meet.google.com/bda-vsem-tuv
Forwarded from انجمن فیزیک ایران
✅ هفدهمین کنفرانس ماده چگال انجمن فیزیک ایران ۱۴۰۳
#اخبار_انجمن_فیزیک_ایران
هفدهمین کنفرانس ماده چگال انجمن فیزیک ایران روزهای ۱۰ و ۱۱ بهمنماه ۱۴۰۳ در دانشگاه تبریز برگزار خواهد شد. زمینههای مورد بحث ابررسانایی ماده چگال نرم و بیو فیزیک درهمتنیدگی کوانتومی و سیستمهای پیچیده دستگاههای همبسته قوی و مغناطیس، مایعات کوانتومی ساختار الکترونی و خواص الکتریکی، مغناطیسی و ...
📣 متن کامل را در Instant View ⚡️ (دکمه پایین صفحه) و یا در وبگاه انجمن فیزیک ایران بخوانید:
🚩http://www.psi.ir/news2_fa.asp?id=4109
⏪ وبگاه انجمن فیزیک ایران:
🌍 http://www.psi.ir
✅ به کانال خبرى انجمن فیزیک ايران بپيوندید:
👇👇🏽👇👇🏽👇👇🏽👇
http://t.me/psinews
#اخبار_انجمن_فیزیک_ایران
هفدهمین کنفرانس ماده چگال انجمن فیزیک ایران روزهای ۱۰ و ۱۱ بهمنماه ۱۴۰۳ در دانشگاه تبریز برگزار خواهد شد. زمینههای مورد بحث ابررسانایی ماده چگال نرم و بیو فیزیک درهمتنیدگی کوانتومی و سیستمهای پیچیده دستگاههای همبسته قوی و مغناطیس، مایعات کوانتومی ساختار الکترونی و خواص الکتریکی، مغناطیسی و ...
📣 متن کامل را در Instant View ⚡️ (دکمه پایین صفحه) و یا در وبگاه انجمن فیزیک ایران بخوانید:
🚩http://www.psi.ir/news2_fa.asp?id=4109
⏪ وبگاه انجمن فیزیک ایران:
🌍 http://www.psi.ir
✅ به کانال خبرى انجمن فیزیک ايران بپيوندید:
👇👇🏽👇👇🏽👇👇🏽👇
http://t.me/psinews
School of Physics: HEPCo Weekly Seminar Series
Speaker
Saeed Abbaslu
Affiliation
School of Physics, IPM
Title of talk
A novel global charge conservation in the symmetric phase of the early Universe
یک بقای بار سراسری جدید در فاز متقارن کیهان اولیه
Date and time
Tuesday, August 27th, 2024 (Shahrivar 6th, 1403), 2:00 pm (Tehran zone)
Link
https://www.skyroom.online/ch/schoolofphysics/highenergyseminar
Abstract
In the Standard Model at high temperatures, anomalous effects contribute to the violation of baryon number ($B$) and lepton number ($L$), separately, while $B-L$ remains conserved. There are also corresponding changes in the helicity of the hypermagnetic field ($h$) and the Chern-Simons numbers of the non-Abelian gauge fields ($N_{\rm CS,W}$ and $N_{\rm CS,S}$). In this study, we investigate a baryogenesis process in the symmetric phase of the early Universe by taking into account the Abelian and non-Abelian anomalous effects as well as the perturbative chirality-flip processes of all fermions. We calculate explicitly the time evolution of all relevant physical quantities, including those of $h$ and $N_{\rm CS,W}$, and show that there is another conserved global charge involving total matter-antimatter asymmetry $B+L$, hypermagnetic helicity $h_B$ and $N_{\rm CS,W}$.
Speaker
Saeed Abbaslu
Affiliation
School of Physics, IPM
Title of talk
A novel global charge conservation in the symmetric phase of the early Universe
یک بقای بار سراسری جدید در فاز متقارن کیهان اولیه
Date and time
Tuesday, August 27th, 2024 (Shahrivar 6th, 1403), 2:00 pm (Tehran zone)
Link
https://www.skyroom.online/ch/schoolofphysics/highenergyseminar
Abstract
In the Standard Model at high temperatures, anomalous effects contribute to the violation of baryon number ($B$) and lepton number ($L$), separately, while $B-L$ remains conserved. There are also corresponding changes in the helicity of the hypermagnetic field ($h$) and the Chern-Simons numbers of the non-Abelian gauge fields ($N_{\rm CS,W}$ and $N_{\rm CS,S}$). In this study, we investigate a baryogenesis process in the symmetric phase of the early Universe by taking into account the Abelian and non-Abelian anomalous effects as well as the perturbative chirality-flip processes of all fermions. We calculate explicitly the time evolution of all relevant physical quantities, including those of $h$ and $N_{\rm CS,W}$, and show that there is another conserved global charge involving total matter-antimatter asymmetry $B+L$, hypermagnetic helicity $h_B$ and $N_{\rm CS,W}$.
www.skyroom.online
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🌪 آیا ماده تاریک وجود دارد؟ حساس ترین آشکارساز جهان، LUX-ZEPLIN، قادر به یافتن ذرات WIMP نیست! 🌪
لینک گزارش
@PDATLAB
لینک گزارش
@PDATLAB
www.abc.net.au
The world's most sensitive detector has found no sign of dark matter. So where is it?
Scientists have yet to find evidence of WIMPs — one of the main contenders for dark matter — in the most sensitive test yet made. We explain what the new results mean.
The course outline: Quantum Field Theory I, Fall 2024
This is an introductory course on quantum field theory (QFT). QFT is a fundamental requirement in the studies of theoretical high energy physics, particle physics and early universe cosmology. It is a vast and well-established subject with applications in many branches of theoretical physics and cosmology. There are many textbooks on QFT, old and new. In this course we will mainly follow the book by Peskin & Schroeder (Perseus Books, 1995). This is an excellent book, emphasizing on various aspects of QFT, both at the level of formalisms and applications. There are other useful books which may be consulted as well. For example, the book by Schwartz (Cam- bridge University Press, 2014) is very useful as well. The QFT book by Steven Weinberg (Cambridge University Press, volume I, 1995) is an excellent reference for deeper under- standings of various topics in QFT. However, because of its high level of presentation, it is not suggested as a regular text book for a first time study in QFT. This is a three-unit course. Our goal is to cover most of part I of Peskin & Schroeder, chapters 1-7.
Time and place of the course: Sunday and Tuesday, 9:00 - 10:30, IPM, School of Astronomy, Larak garden.
My Contact information Hassan Firouzjahi IPM, School of Astronomy, Larak garden e-mail: firouz@ipm.ir
This is an introductory course on quantum field theory (QFT). QFT is a fundamental requirement in the studies of theoretical high energy physics, particle physics and early universe cosmology. It is a vast and well-established subject with applications in many branches of theoretical physics and cosmology. There are many textbooks on QFT, old and new. In this course we will mainly follow the book by Peskin & Schroeder (Perseus Books, 1995). This is an excellent book, emphasizing on various aspects of QFT, both at the level of formalisms and applications. There are other useful books which may be consulted as well. For example, the book by Schwartz (Cam- bridge University Press, 2014) is very useful as well. The QFT book by Steven Weinberg (Cambridge University Press, volume I, 1995) is an excellent reference for deeper under- standings of various topics in QFT. However, because of its high level of presentation, it is not suggested as a regular text book for a first time study in QFT. This is a three-unit course. Our goal is to cover most of part I of Peskin & Schroeder, chapters 1-7.
Time and place of the course: Sunday and Tuesday, 9:00 - 10:30, IPM, School of Astronomy, Larak garden.
My Contact information Hassan Firouzjahi IPM, School of Astronomy, Larak garden e-mail: firouz@ipm.ir