Forwarded from انجمن فیزیک ایران
✅ فیزیکدانان "زمان منفی" را در آزمایشها مشاهده کردند
#اخبار_علمی_و_پژوهشی
دانشمندان مدتهاست میدانند که به نظر میرسد نور گاهی قبل از ورود به یک ماده، از آن خارج میشود، اثری که به عنوان توهم ناشی از تغییر شکل امواج توسط ماده نادیده گرفته میشد. اکنون، پژوهشگران دانشگاه تورنتو از طریق آزمایشهای نوآورانه کوانتومی میگویند که ثابت کردهاند "زمان منفی" دیگر فقط یک ایده ...
📣 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=4168
⏪ وبگاه انجمن فیزیک ایران:
🌍 http://www.psi.ir
✅ به کانال خبرى انجمن فیزیک ايران بپيوندید:
👇👇🏽👇👇🏽👇👇🏽👇
http://t.me/psinews
#اخبار_علمی_و_پژوهشی
دانشمندان مدتهاست میدانند که به نظر میرسد نور گاهی قبل از ورود به یک ماده، از آن خارج میشود، اثری که به عنوان توهم ناشی از تغییر شکل امواج توسط ماده نادیده گرفته میشد. اکنون، پژوهشگران دانشگاه تورنتو از طریق آزمایشهای نوآورانه کوانتومی میگویند که ثابت کردهاند "زمان منفی" دیگر فقط یک ایده ...
📣 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=4168
⏪ وبگاه انجمن فیزیک ایران:
🌍 http://www.psi.ir
✅ به کانال خبرى انجمن فیزیک ايران بپيوندید:
👇👇🏽👇👇🏽👇👇🏽👇
http://t.me/psinews
t.me
فیزیکدانان "زمان منفی" را در آزمایشها مشاهده کردند
School of Particles and Accelerators
Wednesday Weekly Seminar – Hybrid Format
Date:
Wednesday, Jan 8, 2025 / چهارشنبه، 19 دی 1403
Time:
11:00 AM - 12:00 PM (Tehran time)
Speaker:
Dr. Saeed Abbaslu
Affiliation:
School of Physics, IPM
Title:
A novel global charge conservation in the symmetric phase of the early universe
Title in Persian:
بار پایسته سراسری در فاز متقارن جهان اولیه
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 (NCS,W and NCS,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 NCS,W, and show that there is another conserved global charge involving total matter-antimatter asymmetry B+L, hypermagnetic helicity hB and NCS,W.
Indico Link: https://indico.hep.ipm.ir/e/s.abbaslou
Meeting Place: Seminar Room, School of Particles and Accelerators, IPM
Link to Join Virtually: https://www.skyroom.online/ch/ipm-particles/weekly-seminar
Wednesday Weekly Seminar – Hybrid Format
Date:
Wednesday, Jan 8, 2025 / چهارشنبه، 19 دی 1403
Time:
11:00 AM - 12:00 PM (Tehran time)
Speaker:
Dr. Saeed Abbaslu
Affiliation:
School of Physics, IPM
Title:
A novel global charge conservation in the symmetric phase of the early universe
Title in Persian:
بار پایسته سراسری در فاز متقارن جهان اولیه
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 (NCS,W and NCS,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 NCS,W, and show that there is another conserved global charge involving total matter-antimatter asymmetry B+L, hypermagnetic helicity hB and NCS,W.
Indico Link: https://indico.hep.ipm.ir/e/s.abbaslou
Meeting Place: Seminar Room, School of Particles and Accelerators, IPM
Link to Join Virtually: https://www.skyroom.online/ch/ipm-particles/weekly-seminar
Indico
Wednesday weekly meeting
General weekly meeting of the school of particles and accelerators (hybrid format) Meeting Place: Seminar Room, School of Particles and Accelerators, IPM Link to join virtually: https://www.skyroom.online/ch/ipm-particles/weekly-seminar
Forwarded from HEP_th
درس امواج گرانشی (2 واحد)
دکتر علی سراج (IPM)
علاقه مندان به شرکت در کلاس درس امواج گرانشی در ترم بهمن، میتوانند برای کسب اطلاعات بیشتر به آدرس زیر مراجعه کنند.
امکان ثبت نام به عنوان دانشجوی مهمان وجود دارد.
https://physics.ipm.ir/courses.jsp
دکتر علی سراج (IPM)
علاقه مندان به شرکت در کلاس درس امواج گرانشی در ترم بهمن، میتوانند برای کسب اطلاعات بیشتر به آدرس زیر مراجعه کنند.
امکان ثبت نام به عنوان دانشجوی مهمان وجود دارد.
https://physics.ipm.ir/courses.jsp
School of Particles and Accelerators
Wednesday Weekly Seminar – Virtual Format
Date:
Wednesday, Jan 22, 2025 / چهارشنبه ، 3 بهمن 1403
Time:
11:00 AM - 12:00 PM (Tehran time)
Speaker:
Dr. Mohammad Javad Vasli
Affiliation:
School of Nano Science, IPM
Title:
Krylov Complexity as a Probe for Chaos
Title in Persian:
پیچیدگی کریلوف به عنوان یک سنجه برای شناسایی آشوب
Abstract:
In this talk, I will explore the use of Krylov complexity as a diagnostic tool for understanding the chaotic nature of quantum systems. The concept of Krylov complexity is introduced within the framework of the Lanczos algorithm, allowing us to study the system's dynamics in a finite Krylov subspace. By analyzing the time evolution and saturation of complexity, it is possible to demonstrate how it distinguishes between chaotic and integrable many-body systems. These distinctions will be illustrated with numerical results from spin models, providing insights into the interplay between Krylov complexity and quantum chaos.
Indico Link: https://indico.hep.ipm.ir/e/m.vasli
Link to Join Virtually: https://www.skyroom.online/ch/ipm-particles/weekly-seminar
Wednesday Weekly Seminar – Virtual Format
Date:
Wednesday, Jan 22, 2025 / چهارشنبه ، 3 بهمن 1403
Time:
11:00 AM - 12:00 PM (Tehran time)
Speaker:
Dr. Mohammad Javad Vasli
Affiliation:
School of Nano Science, IPM
Title:
Krylov Complexity as a Probe for Chaos
Title in Persian:
پیچیدگی کریلوف به عنوان یک سنجه برای شناسایی آشوب
Abstract:
In this talk, I will explore the use of Krylov complexity as a diagnostic tool for understanding the chaotic nature of quantum systems. The concept of Krylov complexity is introduced within the framework of the Lanczos algorithm, allowing us to study the system's dynamics in a finite Krylov subspace. By analyzing the time evolution and saturation of complexity, it is possible to demonstrate how it distinguishes between chaotic and integrable many-body systems. These distinctions will be illustrated with numerical results from spin models, providing insights into the interplay between Krylov complexity and quantum chaos.
Indico Link: https://indico.hep.ipm.ir/e/m.vasli
Link to Join Virtually: https://www.skyroom.online/ch/ipm-particles/weekly-seminar
Indico
Wednesday weekly meeting
General weekly meeting of the school of particles and accelerators (virtual format) Link to join virtually: https://www.skyroom.online/ch/ipm-particles/weekly-seminar
School of Physics: HEPCo Weekly Seminar Series
Speaker
Taewook Youn
Affiliation
Cornell University,
Korea Institute for Advanced Study
Title of talk
Dark Acoustic Oscillation Faces the Cosmological Tension
مواجه اختلال نوسانی تاریک با تنش کیهانی
Date and time
Tuesday, January 21st, 2025 (Bahman 2nd, 1403), 2:00 pm (Tehran zone)
Link
https://www.skyroom.online/ch/schoolofphysics/highenergyseminar
Abstract
With the growing precision of cosmological measurements, tensions in the determination of cosmological parameters have arisen that might be the first manifestations of physics going beyond Lambda CDM. We propose a new class of interacting dark sector models, which lead to qualitatively distinct cosmological behavior, dark acoustic oscillation, which can potentially simultaneously address the two most important tensions in cosmological data, the H0 and S8 tensions. The main ingredients in this class of models are self-interacting dark radiation and its dark acoustic oscillation induced by strong interactions with a fraction of dark matter. I will also present the latest results from applying this model across various combinations of cosmological data, illustrating the improvement it provides over Lambda CDM.
Speaker
Taewook Youn
Affiliation
Cornell University,
Korea Institute for Advanced Study
Title of talk
Dark Acoustic Oscillation Faces the Cosmological Tension
مواجه اختلال نوسانی تاریک با تنش کیهانی
Date and time
Tuesday, January 21st, 2025 (Bahman 2nd, 1403), 2:00 pm (Tehran zone)
Link
https://www.skyroom.online/ch/schoolofphysics/highenergyseminar
Abstract
With the growing precision of cosmological measurements, tensions in the determination of cosmological parameters have arisen that might be the first manifestations of physics going beyond Lambda CDM. We propose a new class of interacting dark sector models, which lead to qualitatively distinct cosmological behavior, dark acoustic oscillation, which can potentially simultaneously address the two most important tensions in cosmological data, the H0 and S8 tensions. The main ingredients in this class of models are self-interacting dark radiation and its dark acoustic oscillation induced by strong interactions with a fraction of dark matter. I will also present the latest results from applying this model across various combinations of cosmological data, illustrating the improvement it provides over Lambda CDM.
www.skyroom.online
Conferencing App
WebRTC Powered Conferencing App
🇦🇺PhD Positions in Exoplanet Atmospheres and Demographics 🇦🇺
Job Denoscription
The Exoplanet group at University of Southern Queensland is inviting candidates for two fully funded PhD scholarships (3 years). Successful candidate will work with Dr George Zhou and Dr Chelsea Huang on topics including
Investigate the evolution and mass loss of young planet atmospheres
Discovering and characterising cool super-Earths around low mass stars
Understanding how atmospheres of giant planets depend on their formation pathways
Understand planet demographics with TESS
The PhD candidates will be part of an active group of astronomers, with recent programs on HST, JWST, and VLT to support these investigations.
Responsibilities and qualifications: We are seeking talented and highly motivated students to work at the cutting edge of the rapidly moving research field of exoplanets. Applicants with previous experience in the mentioned areas of research, strong programming skills are strongly encouraged to apply.
Application Details
Application Instructions
Applicants are required to send their CV to the Supervisory team before the deadline: Dr George Zhou (george.zhou@unisq.edu.au) and Dr Chelsea Huang (chelsea.huang@unisq.edu.au).
Shortlisted candidates will also need to submit a trannoscript and a letter of the reference.
Publication Start Date
2025 Jan 20
Application Deadline
2025 Mar 07
Job Denoscription
The Exoplanet group at University of Southern Queensland is inviting candidates for two fully funded PhD scholarships (3 years). Successful candidate will work with Dr George Zhou and Dr Chelsea Huang on topics including
Investigate the evolution and mass loss of young planet atmospheres
Discovering and characterising cool super-Earths around low mass stars
Understanding how atmospheres of giant planets depend on their formation pathways
Understand planet demographics with TESS
The PhD candidates will be part of an active group of astronomers, with recent programs on HST, JWST, and VLT to support these investigations.
Responsibilities and qualifications: We are seeking talented and highly motivated students to work at the cutting edge of the rapidly moving research field of exoplanets. Applicants with previous experience in the mentioned areas of research, strong programming skills are strongly encouraged to apply.
Application Details
Application Instructions
Applicants are required to send their CV to the Supervisory team before the deadline: Dr George Zhou (george.zhou@unisq.edu.au) and Dr Chelsea Huang (chelsea.huang@unisq.edu.au).
Shortlisted candidates will also need to submit a trannoscript and a letter of the reference.
Publication Start Date
2025 Jan 20
Application Deadline
2025 Mar 07
School of Particles and Accelerators
Journal Club: Experiments & Phenomenology / Hybrid Format
Date:
Monday, Jan 27, 2025 / دوشنبه، 8 بهمن 1403
Time:
13:00 PM - 14:00 PM (Tehran time)
Speaker:
Dr. Leila Shahkarami
Affiliation:
Damghan University & School of Particles and Accelerators, IPM
Title:
Deconfinement and chiral restoration phase transition in rotating hot and dense QCD matter
Title in Persian:
گذار فاز رفع حبس شدگی و بازسازی کایرال در ماده کرومودینامیک کوانتومی داغ و چگال در حال چرخش
Abstract:
In non-central ultra-relativistic heavy-ion collisions, the angular momentum can reach magnitudes of ${\cal O}(10^4 −10^5)\hbar$, resulting in significant vorticity within the quark-gluon plasma (QGP). One intriguing consequence of this rotation is its impact on the chiral symmetry restoration and deconfinement phase transitions, a topic that has attracted considerable attention in recent years. In this talk, I will review some recent advances in using holographic techniques to explore these rotational effects. Beginning with a basic holographic model, I will discuss its limitations and show how employing more refined models resolves these issues, achieving consistency with lattice QCD results. The findings highlight the necessity of incorporating rotational effects on both gluodynamics and chiral dynamics simultaneously to obtain accurate predictions.
Based on: https://arXiv:2405.06386v1, arXiv:2010.14478v2
Meeting Place: Seminar Room, School of Particles and Accelerators, IPM
Link to Join Virtually: https://www.skyroom.online/ch/ipm-particles/journal-club
Journal Club: Experiments & Phenomenology / Hybrid Format
Date:
Monday, Jan 27, 2025 / دوشنبه، 8 بهمن 1403
Time:
13:00 PM - 14:00 PM (Tehran time)
Speaker:
Dr. Leila Shahkarami
Affiliation:
Damghan University & School of Particles and Accelerators, IPM
Title:
Deconfinement and chiral restoration phase transition in rotating hot and dense QCD matter
Title in Persian:
گذار فاز رفع حبس شدگی و بازسازی کایرال در ماده کرومودینامیک کوانتومی داغ و چگال در حال چرخش
Abstract:
In non-central ultra-relativistic heavy-ion collisions, the angular momentum can reach magnitudes of ${\cal O}(10^4 −10^5)\hbar$, resulting in significant vorticity within the quark-gluon plasma (QGP). One intriguing consequence of this rotation is its impact on the chiral symmetry restoration and deconfinement phase transitions, a topic that has attracted considerable attention in recent years. In this talk, I will review some recent advances in using holographic techniques to explore these rotational effects. Beginning with a basic holographic model, I will discuss its limitations and show how employing more refined models resolves these issues, achieving consistency with lattice QCD results. The findings highlight the necessity of incorporating rotational effects on both gluodynamics and chiral dynamics simultaneously to obtain accurate predictions.
Based on: https://arXiv:2405.06386v1, arXiv:2010.14478v2
Meeting Place: Seminar Room, School of Particles and Accelerators, IPM
Link to Join Virtually: https://www.skyroom.online/ch/ipm-particles/journal-club
Journal Club: Experiments & Phenomenology / Hybrid Format
Date:
Monday, Feb 3, 2025 / دوشنبه، 15 بهمن 1403
Time:
11:00 AM - 12:00 PM (Tehran time)
Speaker:
Dr. Muhammad Goharipour
Affiliation:
School of Physics, IPM
Title:
The pressure distribution inside the proton
Title in Persian:
توزیع فشار در پروتون
Abstract:
The proton, one of the components of atomic nuclei, is composed of fundamental particles called quarks and gluons. Gluons are the carriers of the force that binds quarks together, and free quarks are never found in isolation—that is, they are confined within the composite particles in which they reside. The origin of quark confinement is one of the most important questions in modern particle and nuclear physics because confinement is at the core of what makes the proton a stable particle and thus provides stability to the Universe. The internal quark structure of the proton is revealed by deeply virtual Compton scattering, a process in which electrons are scattered off quarks inside the protons, which subsequently emit high-energy photons, which are detected in coincidence with the scattered electrons and recoil protons. Here we report a measurement of the pressure distribution experienced by the quarks in the proton. We find a strong repulsive pressure near the centre of the proton (up to 0.6 femtometers) and a binding pressure at greater distances. The average peak pressure near the centre is about 1035 pascals, which exceeds the pressure estimated for the most densely packed known objects in the Universe, neutron stars. This work opens up a new area of research on the fundamental gravitational properties of protons, neutrons and nuclei, which can provide access to their physical radii, the internal shear forces acting on the quarks and their pressure distributions.
Based on: https://doi.org/10.1038/s41586-018-0060-z
Meeting Place: Seminar Room, School of Particles and Accelerators, IPM
Link to Join Virtually: https://www.skyroom.online/ch/ipm-particles/journal-club
Date:
Monday, Feb 3, 2025 / دوشنبه، 15 بهمن 1403
Time:
11:00 AM - 12:00 PM (Tehran time)
Speaker:
Dr. Muhammad Goharipour
Affiliation:
School of Physics, IPM
Title:
The pressure distribution inside the proton
Title in Persian:
توزیع فشار در پروتون
Abstract:
The proton, one of the components of atomic nuclei, is composed of fundamental particles called quarks and gluons. Gluons are the carriers of the force that binds quarks together, and free quarks are never found in isolation—that is, they are confined within the composite particles in which they reside. The origin of quark confinement is one of the most important questions in modern particle and nuclear physics because confinement is at the core of what makes the proton a stable particle and thus provides stability to the Universe. The internal quark structure of the proton is revealed by deeply virtual Compton scattering, a process in which electrons are scattered off quarks inside the protons, which subsequently emit high-energy photons, which are detected in coincidence with the scattered electrons and recoil protons. Here we report a measurement of the pressure distribution experienced by the quarks in the proton. We find a strong repulsive pressure near the centre of the proton (up to 0.6 femtometers) and a binding pressure at greater distances. The average peak pressure near the centre is about 1035 pascals, which exceeds the pressure estimated for the most densely packed known objects in the Universe, neutron stars. This work opens up a new area of research on the fundamental gravitational properties of protons, neutrons and nuclei, which can provide access to their physical radii, the internal shear forces acting on the quarks and their pressure distributions.
Based on: https://doi.org/10.1038/s41586-018-0060-z
Meeting Place: Seminar Room, School of Particles and Accelerators, IPM
Link to Join Virtually: https://www.skyroom.online/ch/ipm-particles/journal-club
Nature
The pressure distribution inside the proton
Nature - Measurements of the quark pressure distribution in the proton reveal a strong repulsive pressure near the proton’s centre (stronger than the pressure in neutron stars) and a binding...
School of Particles and Accelerators
Wednesday Weekly Seminar – Virtual Format
Date:
Wednesday, Feb 12, 2025 / چهارشنبه، 24 بهمن 1403
Time:
11:00 AM - 12:00 PM (Tehran time)
Speaker:
Dr. Ebrahim Yusofi
Affiliation:
Amol University and IPM
Title:
An Effort for a Void-Based Cosmology
Title in Persian:
تلاشی برای یک کیهان شناسی مبتنی بر تهی جاها
Abstract:
Standard cosmology, as the main theoretical framework, studies the structure and evolution of the universe. This talk focuses on the tensions in standard cosmology and examines the initial motivations for introducing a void-based cosmology. In this new framework, voids are introduced as independent and dynamic components in the structure of the cosmic web. The "drop-bubble" model for cosmology is presented and the relationship between the surface tension of voids with the cosmological constant, modified uncertainty principle, and the expansion of the universe due to the merger of these voids on a large scale is examined. Finally, a summary of the results and ongoing work in this area that will lead to a profound transformation in our understanding of cosmic structure is presented.
Indico Link: https://indico.hep.ipm.ir/e/e.yusofi
Link to Join Virtually: https://www.skyroom.online/ch/ipm-particles/weekly-seminar
Wednesday Weekly Seminar – Virtual Format
Date:
Wednesday, Feb 12, 2025 / چهارشنبه، 24 بهمن 1403
Time:
11:00 AM - 12:00 PM (Tehran time)
Speaker:
Dr. Ebrahim Yusofi
Affiliation:
Amol University and IPM
Title:
An Effort for a Void-Based Cosmology
Title in Persian:
تلاشی برای یک کیهان شناسی مبتنی بر تهی جاها
Abstract:
Standard cosmology, as the main theoretical framework, studies the structure and evolution of the universe. This talk focuses on the tensions in standard cosmology and examines the initial motivations for introducing a void-based cosmology. In this new framework, voids are introduced as independent and dynamic components in the structure of the cosmic web. The "drop-bubble" model for cosmology is presented and the relationship between the surface tension of voids with the cosmological constant, modified uncertainty principle, and the expansion of the universe due to the merger of these voids on a large scale is examined. Finally, a summary of the results and ongoing work in this area that will lead to a profound transformation in our understanding of cosmic structure is presented.
Indico Link: https://indico.hep.ipm.ir/e/e.yusofi
Link to Join Virtually: https://www.skyroom.online/ch/ipm-particles/weekly-seminar
Indico
Wednesday weekly meeting
General weekly meeting of the school of particles and accelerators (virtual format) Link to join virtually: https://www.skyroom.online/ch/ipm-particles/weekly-seminar
School of Physics: HEPCo Weekly Seminar Series
Speaker
Toni Bertólez Martínez
Affiliation
ICCUB
Title of talk
What is the origin of cosmological neutrino mass bounds? Background versus perturbations
قیود کیهانی بر روی جرم نوترینو از کجا میآید؟ کیهان زمینه یا اختلالات
Date and time
Tuesday, February 11th, 2025 (Bahman 23rd, 1403), 2:00 pm (Tehran zone)
Link
https://www.skyroom.online/ch/schoolofphysics/highenergyseminar
Abstract
The cosmological upper bound on the total neutrino mass is the dominant limit on this fundamental parameter. Recent observations have strongly tightened it, approaching the lower limit set by oscillation data. Understanding its physical origin, robustness, and model-independence becomes pressing. In this seminar I will introduce a novel framework to explicitly separate for the first time the two distinct cosmological neutrino-mass effects. On the one hand, the impact on background evolution, related to the energy in neutrino masses; on the other hand, the "kinematic" impact on perturbations, related to neutrino free-streaming. I will didactically explain how these effects separately modify CMB anisotropies, by introducing two effective masses enclosing background and perturbations effects. I will explain the results of analyzing CMB data in this framework, which show that the neutrino-mass bound is mostly a background measurement, i.e., how the neutrino energy density evolves with time. The results also quantify the difficulty of measuring the neutrino "kinematical" mass, whose bound is relaxed by 3 orders of magnitude.
Speaker
Toni Bertólez Martínez
Affiliation
ICCUB
Title of talk
What is the origin of cosmological neutrino mass bounds? Background versus perturbations
قیود کیهانی بر روی جرم نوترینو از کجا میآید؟ کیهان زمینه یا اختلالات
Date and time
Tuesday, February 11th, 2025 (Bahman 23rd, 1403), 2:00 pm (Tehran zone)
Link
https://www.skyroom.online/ch/schoolofphysics/highenergyseminar
Abstract
The cosmological upper bound on the total neutrino mass is the dominant limit on this fundamental parameter. Recent observations have strongly tightened it, approaching the lower limit set by oscillation data. Understanding its physical origin, robustness, and model-independence becomes pressing. In this seminar I will introduce a novel framework to explicitly separate for the first time the two distinct cosmological neutrino-mass effects. On the one hand, the impact on background evolution, related to the energy in neutrino masses; on the other hand, the "kinematic" impact on perturbations, related to neutrino free-streaming. I will didactically explain how these effects separately modify CMB anisotropies, by introducing two effective masses enclosing background and perturbations effects. I will explain the results of analyzing CMB data in this framework, which show that the neutrino-mass bound is mostly a background measurement, i.e., how the neutrino energy density evolves with time. The results also quantify the difficulty of measuring the neutrino "kinematical" mass, whose bound is relaxed by 3 orders of magnitude.
www.skyroom.online
Conferencing App
WebRTC Powered Conferencing App
Forwarded from Theoretical_Physics
پژوهشکده ذرات و شتابگرها
اطلاعیه
اساتید و همکاران گرامی
با سلام و احترام؛
به اطلاع می رساند پژوهشکده ذرات و شتابگرها در نظر دارد هفتمین دوره کلاس بین المللی ذرات بنیادی(ویژه دانش آموزان دبیرستان سال دهم، یازدهم و دوازدهم) را با هدف "آشنایی دانش آموزان دبیرستانی با مفاهیم ابتدایی فیزیک ذرات بنیادی" در تاریخ 20 اسفند ماه 1403 به صورت مجازی برگزار نماید. به پیوست یک نسخه از پوستر این مسترکلاس جهت اطلاع رسانی به کلیه علاقه مندان، حضورتان ارسال می گردد.
کلیه اطلاعات مربوط به این رویداد در نشانی زیر قابل مشاهده است:
https://particles.ipm.ir/conferences/2025/masterclass/index.jsp
اطلاعیه
اساتید و همکاران گرامی
با سلام و احترام؛
به اطلاع می رساند پژوهشکده ذرات و شتابگرها در نظر دارد هفتمین دوره کلاس بین المللی ذرات بنیادی(ویژه دانش آموزان دبیرستان سال دهم، یازدهم و دوازدهم) را با هدف "آشنایی دانش آموزان دبیرستانی با مفاهیم ابتدایی فیزیک ذرات بنیادی" در تاریخ 20 اسفند ماه 1403 به صورت مجازی برگزار نماید. به پیوست یک نسخه از پوستر این مسترکلاس جهت اطلاع رسانی به کلیه علاقه مندان، حضورتان ارسال می گردد.
کلیه اطلاعات مربوط به این رویداد در نشانی زیر قابل مشاهده است:
https://particles.ipm.ir/conferences/2025/masterclass/index.jsp
با سلام
احتراما به اطلاع می رساند بیست وهفتمین گردهمایی پژوهشی نجوم ایران در دانشگاه تحصیلات تکمیلی علوم پایه زنجان
در تاریخ ۳۱ اردیبهشت تا ۲ خرداد 1404 برگزار خواهد شد.
از همه علاقهمندان برای شرکت در این همایش دعوت میشود و خواهشمند است جهت ثبت نام و
ارسال مقاله به وبسایت گردهمایی در آدرس زیر مراجعه فرمایند:
https://iasbs.ac.ir/~astro/
مهلت ثبت نام و ارسال مقالات تا تاریخ۲۰ فروردین ماه است.
با احترام
سمیه شیخ نظامی
دبیر علمی
بیست و هفتمین گردهمایی پژوهشی نجوم ایران
احتراما به اطلاع می رساند بیست وهفتمین گردهمایی پژوهشی نجوم ایران در دانشگاه تحصیلات تکمیلی علوم پایه زنجان
در تاریخ ۳۱ اردیبهشت تا ۲ خرداد 1404 برگزار خواهد شد.
از همه علاقهمندان برای شرکت در این همایش دعوت میشود و خواهشمند است جهت ثبت نام و
ارسال مقاله به وبسایت گردهمایی در آدرس زیر مراجعه فرمایند:
https://iasbs.ac.ir/~astro/
مهلت ثبت نام و ارسال مقالات تا تاریخ۲۰ فروردین ماه است.
با احترام
سمیه شیخ نظامی
دبیر علمی
بیست و هفتمین گردهمایی پژوهشی نجوم ایران
Forwarded from Theoretical_Physics
Distinguishable Consequence of Classical Gravity on Quantum Matter
Serhii Kryhin, Vivishek Sudhir
Phys. Rev. Lett. 134, 061501 – Published 12 February, 2025
آیا گرانش نیاز به کوانتومی شدن دارد؟ این سوال همچنان موافقان و مخالفان با دلایل خود را دارد. در این مقاله جدید پیشنهاد شده که کلاسیک بودن گرانش در حضور ماده کوانتومی قابلیت آزمایش تجربی دارد.
Serhii Kryhin, Vivishek Sudhir
Phys. Rev. Lett. 134, 061501 – Published 12 February, 2025
آیا گرانش نیاز به کوانتومی شدن دارد؟ این سوال همچنان موافقان و مخالفان با دلایل خود را دارد. در این مقاله جدید پیشنهاد شده که کلاسیک بودن گرانش در حضور ماده کوانتومی قابلیت آزمایش تجربی دارد.
Physical Review Letters
Distinguishable Consequence of Classical Gravity on Quantum Matter
What if gravity is classical? If true, a consistent coexistence of classical gravity and quantum matter requires that gravity exhibit irreducible fluctuations. These fluctuations can mediate classical correlations, but not quantum entanglement, between the…
School of Physics: HEPCo Weekly Seminar Series
Speaker
Hamed Adami
Affiliation
Fudan University
Shanghai institute for mathematics and interdisciplinary sciences
Title of talk
Gravitational Stress Tensor and Current at Null Infinity in Three Dimensions
تانسور تنش و جریان در بینهایت نال در سه بعد
Date and time
Tuesday, February 25th, 2025 (Esfand 7th, 1403), 2:00 pm (Tehran zone)
Link
https://www.skyroom.online/ch/schoolofphysics/highenergyseminar
Abstract
We develop the framework that reveals the intrinsic conserved stress tensor and current associated with the null infinity of a three-dimensional (3d) asymptotically flat spacetime. These are, respectively, canonical conjugates of degenerate metric and Ehresmann connection of the boundary Carrollian geometry. Their conservation reproduces the Bondi-mass and angular momentum conservation equations if the asymptotic boundary is endowed with a torsional affine connection that we specify. Our analysis and results shed further light on the 3d flat holography; the stress tensor and current give rise to an asymptotically flat fluid/gravity correspondence. The requirement of a well-defined 3d action principle yields Schwarzian action at null infinity governing the dynamics induced by reparametrizations over the celestial circle, in accord with the codimension $2$ holography of 3d flat spacetimes.
Speaker
Hamed Adami
Affiliation
Fudan University
Shanghai institute for mathematics and interdisciplinary sciences
Title of talk
Gravitational Stress Tensor and Current at Null Infinity in Three Dimensions
تانسور تنش و جریان در بینهایت نال در سه بعد
Date and time
Tuesday, February 25th, 2025 (Esfand 7th, 1403), 2:00 pm (Tehran zone)
Link
https://www.skyroom.online/ch/schoolofphysics/highenergyseminar
Abstract
We develop the framework that reveals the intrinsic conserved stress tensor and current associated with the null infinity of a three-dimensional (3d) asymptotically flat spacetime. These are, respectively, canonical conjugates of degenerate metric and Ehresmann connection of the boundary Carrollian geometry. Their conservation reproduces the Bondi-mass and angular momentum conservation equations if the asymptotic boundary is endowed with a torsional affine connection that we specify. Our analysis and results shed further light on the 3d flat holography; the stress tensor and current give rise to an asymptotically flat fluid/gravity correspondence. The requirement of a well-defined 3d action principle yields Schwarzian action at null infinity governing the dynamics induced by reparametrizations over the celestial circle, in accord with the codimension $2$ holography of 3d flat spacetimes.
www.skyroom.online
Conferencing App
WebRTC Powered Conferencing App
Forwarded from انجمن فیزیک ایران
✅ کنفرانس فیزیک ایران و سیامین همایش دانشجویی فیزیک ۱۴۰۴ دانشگاه یاسوج
#اخبار_انجمن_فیزیک_ایران
کنفرانس فیزیک ایران و سیامین همایش دانشجویی فیزیک، از تاریخ ۳ تا ۶ شهریورماه ۱۴۰۴ توسط انجمن فیزیک ایران و دانشگاه یاسوج برگزار میشود. اولویت شرکت با اعضای انجمن فیزیک و ارائهدهندگان مقاله است. لازم است همهی متقاضیان شرکت در کنفرانس از جمله مقالهدهندگان، پرسشنامه الکترونیکی ثبتنام در کنفرانس ...
📣 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=4195
⏪ وبگاه انجمن فیزیک ایران:
🌍 http://www.psi.ir
✅ به کانال خبرى انجمن فیزیک ايران بپيوندید:
👇👇🏽👇👇🏽👇👇🏽👇
http://t.me/psinews
#اخبار_انجمن_فیزیک_ایران
کنفرانس فیزیک ایران و سیامین همایش دانشجویی فیزیک، از تاریخ ۳ تا ۶ شهریورماه ۱۴۰۴ توسط انجمن فیزیک ایران و دانشگاه یاسوج برگزار میشود. اولویت شرکت با اعضای انجمن فیزیک و ارائهدهندگان مقاله است. لازم است همهی متقاضیان شرکت در کنفرانس از جمله مقالهدهندگان، پرسشنامه الکترونیکی ثبتنام در کنفرانس ...
📣 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=4195
⏪ وبگاه انجمن فیزیک ایران:
🌍 http://www.psi.ir
✅ به کانال خبرى انجمن فیزیک ايران بپيوندید:
👇👇🏽👇👇🏽👇👇🏽👇
http://t.me/psinews
t.me
کنفرانس فیزیک ایران و سیامین همایش دانشجویی فیزیک ۱۴۰۴ دانشگاه یاسوج
Forwarded from انجمن فیزیک ایران
✅ کارگاه آشنایی مقدماتی با زیمکس اپتیک استودیو
#اخبار_انجمن_فیزیک_ایران
گروه فیزیک بین رشتهای و فناوری دانشگاه شهید باهنر کرمان با همکاری شاخه بانوان انجمن فیزیک ایران کارگاه آشنایی مقدماتی با زیمکس اپتیک استودیو را در ۱۴ و ۱۵ اسفندماه ۱۴۰۳ برگزار میکند. شرکت در این کارگاه که به صورت حضوری و مجازی برگزار میشود برای عموم علاقمندان رایگان میباشد. برای کسب اطلاعات ...
📣 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=4198
⏪ وبگاه انجمن فیزیک ایران:
🌍 http://www.psi.ir
✅ به کانال خبرى انجمن فیزیک ايران بپيوندید:
👇👇🏽👇👇🏽👇👇🏽👇
http://t.me/psinews
#اخبار_انجمن_فیزیک_ایران
گروه فیزیک بین رشتهای و فناوری دانشگاه شهید باهنر کرمان با همکاری شاخه بانوان انجمن فیزیک ایران کارگاه آشنایی مقدماتی با زیمکس اپتیک استودیو را در ۱۴ و ۱۵ اسفندماه ۱۴۰۳ برگزار میکند. شرکت در این کارگاه که به صورت حضوری و مجازی برگزار میشود برای عموم علاقمندان رایگان میباشد. برای کسب اطلاعات ...
📣 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=4198
⏪ وبگاه انجمن فیزیک ایران:
🌍 http://www.psi.ir
✅ به کانال خبرى انجمن فیزیک ايران بپيوندید:
👇👇🏽👇👇🏽👇👇🏽👇
http://t.me/psinews
t.me
کارگاه آشنایی مقدماتی با زیمکس اپتیک استودیو
سومین مدرسه انرژی های بالا در ۲۸ و ۲۹ فروردین ماه سال ۱۴۰۴ به همت پژوهشکده فیزیک نظری به طور حضوری برگزار خواهد شد.
از علاقه مندان دعوت می نمایم که برای اطلاعات بیشتر و ثبت نام به سایت زیر مراجعه کنند.
https://physics.ipm.ac.ir/conferences/ishep2025/index.jsp
آخرین مهلت ثبت نام: ۱۶ فروردین ۱۴۰۴
از علاقه مندان دعوت می نمایم که برای اطلاعات بیشتر و ثبت نام به سایت زیر مراجعه کنند.
https://physics.ipm.ac.ir/conferences/ishep2025/index.jsp
آخرین مهلت ثبت نام: ۱۶ فروردین ۱۴۰۴
Forwarded from UT.Physics.Seminars
@UTPhysicsWeeklySeminars
Hybrid Workshop on
Light-Matter Interaction & Quantum Coherence Effects
School of Quantum Physics and Matter
23 April 2025 (3 Ordibehesht 1404)
https://qpm.ipm.ac.ir/conferences/Lightmatter/confhome.jsp
Hybrid Workshop on
Light-Matter Interaction & Quantum Coherence Effects
School of Quantum Physics and Matter
23 April 2025 (3 Ordibehesht 1404)
https://qpm.ipm.ac.ir/conferences/Lightmatter/confhome.jsp
School of Physics: HEPCo Weekly Seminar Series
Speaker
Shahin Sheikh Jabbari
Affiliation
IPM
Title of talk
A proposal for a Covariant Arrow of Time
پیشنهادی برای پیکان زمان هموردا
Date and time
Tuesday, March 11th, 2025 (Esfand 21st, 1403), 2:00 pm (Tehran zone)
Location
Room C, Floor 2, Farmanieh Building, No. 70, Lavasani St.
Link
https://www.skyroom.online/ch/schoolofphysics/highenergyseminar
Abstract
While fundamental formulations of physics, such as Newtonian mechanics, General Relativity (GR), and Quantum Mechanics, are time-symmetric, the universe around us is clearly not. The quest for an arrow of time has been a longstanding issue. In this talk, I propose a “generally covariant arrow of time” based on quantum (semiclassical) considerations in GR.
Speaker
Shahin Sheikh Jabbari
Affiliation
IPM
Title of talk
A proposal for a Covariant Arrow of Time
پیشنهادی برای پیکان زمان هموردا
Date and time
Tuesday, March 11th, 2025 (Esfand 21st, 1403), 2:00 pm (Tehran zone)
Location
Room C, Floor 2, Farmanieh Building, No. 70, Lavasani St.
Link
https://www.skyroom.online/ch/schoolofphysics/highenergyseminar
Abstract
While fundamental formulations of physics, such as Newtonian mechanics, General Relativity (GR), and Quantum Mechanics, are time-symmetric, the universe around us is clearly not. The quest for an arrow of time has been a longstanding issue. In this talk, I propose a “generally covariant arrow of time” based on quantum (semiclassical) considerations in GR.
www.skyroom.online
Conferencing App
WebRTC Powered Conferencing App
با سلام واحترام،
به اطلاع می رساند کارگاه آموزشی-عملی "نگاه محاسباتی به شاره های اخترفیزیک" مورخ 11-9 اردیبهشت 1404 توسط پژوهشکده نجوم برگزار خواهد شد.
مهلت ثبت نام: 15/01/1404
لطفاً برای کسب اطلاعات بیشتر به پوستر کارگاه (در پیوست) و یا به آدرس زیر مراجعه فرمایید:
https://astro.ipm.ac.ir/conferences/AstrophysicalFlows/index.jsp
به اطلاع می رساند کارگاه آموزشی-عملی "نگاه محاسباتی به شاره های اخترفیزیک" مورخ 11-9 اردیبهشت 1404 توسط پژوهشکده نجوم برگزار خواهد شد.
مهلت ثبت نام: 15/01/1404
لطفاً برای کسب اطلاعات بیشتر به پوستر کارگاه (در پیوست) و یا به آدرس زیر مراجعه فرمایید:
https://astro.ipm.ac.ir/conferences/AstrophysicalFlows/index.jsp