Forwarded from Theoretical_Physics (Ghadir Jafari)
اثر امپمبا به این مشاهده گفته میشود که آب گرم زود تر از آب سرد یخ میزند. این پدیده به خاطر اراستو امپمبا تازانیایی نامگذاری شده است که اولین بار به عنوان یک دانشآموز در مدرسه در سال ۱۹۶۳ این مشاهده را انجام داده است.
هر چند روی وجود این پدیده و شرایط آن هنوز اختلاف نظرهایی وجود دارد اما توضیحات مختلفی هم برای وجود دارد.
در هفته گذشته سه مقاله در مجله prl چاپ شده که ورژن کوانتومی این پدیده را بررسی کرده اند و چالش های جدیدی را برای ترمودینامیک کوانتومی به وجود آورده است.
Observing the Quantum Mpemba Effect in Quantum Simulations
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.133.010402
Microscopic Origin of the Quantum Mpemba Effect in Integrable Systems
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.133.010401
Inverse Mpemba Effect Demonstrated on a Single Trapped Ion Qubit
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.133.010403
خلاصه را در خبر زیر می توانید ببینید:
Exploring Quantum Mpemba Effects
https://physics.aps.org/articles/v17/105
هر چند روی وجود این پدیده و شرایط آن هنوز اختلاف نظرهایی وجود دارد اما توضیحات مختلفی هم برای وجود دارد.
در هفته گذشته سه مقاله در مجله prl چاپ شده که ورژن کوانتومی این پدیده را بررسی کرده اند و چالش های جدیدی را برای ترمودینامیک کوانتومی به وجود آورده است.
Observing the Quantum Mpemba Effect in Quantum Simulations
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.133.010402
Microscopic Origin of the Quantum Mpemba Effect in Integrable Systems
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.133.010401
Inverse Mpemba Effect Demonstrated on a Single Trapped Ion Qubit
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.133.010403
خلاصه را در خبر زیر می توانید ببینید:
Exploring Quantum Mpemba Effects
https://physics.aps.org/articles/v17/105
Wednesday Weekly Seminar – Hybrid Format
Date:
Wednesday, July 10, 2024 / چهارشنبه، 20 تیر 1403
Time:
11:00 AM - 12:00 PM (Tehran time)
Speaker:
Dr. Hamed Abdolmaleki
Affiliation:
Malayer University & IPM
Title:
Exploring SMEFT Couplings Using the Forward-Backward Asymmetry in Neutral Current Drell-Yan Production at the LHC
Title in Persian:
بررسی کوپلینگهای نظریه میدانهای موثر مدل استاندارد در شتابدهنده بزرگ هادرونی
Abstract:
Neutral current Drell-Yan (DY) lepton-pair production is considered in the framework of the Standard Model Effective Field Theory (SMEFT). Using the open-source fit platform xFitter, we investigate the impact of high-statistics measurements of the neutral current DY (NCDY) forward-backward asymmetry AFB near the weak boson mass scale in the present and forthcoming stages of the Large Hadron Collider (LHC). Besides recovering earlier results on the AFB sensitivity to parton distribution functions, we analyze the precision determination of Z-boson couplings to left-handed and right-handed u-quarks and d-quarks, and explore Beyond-Standard-Model contributions using the SMEFT framework. We comment on the role of the AFB asymmetry for the electroweak SMEFT fit and precision Z-boson physics at the LHC and high-luminosity HL-LHC.
Indico Link: https://indico.hep.ipm.ir/e/h.abdolmaleki2
Meeting Place: Seminar Room, School of Particles and Accelerators, IPM
Link to Join Virtually: https://meet.google.com/bda-vsem-tuv
Date:
Wednesday, July 10, 2024 / چهارشنبه، 20 تیر 1403
Time:
11:00 AM - 12:00 PM (Tehran time)
Speaker:
Dr. Hamed Abdolmaleki
Affiliation:
Malayer University & IPM
Title:
Exploring SMEFT Couplings Using the Forward-Backward Asymmetry in Neutral Current Drell-Yan Production at the LHC
Title in Persian:
بررسی کوپلینگهای نظریه میدانهای موثر مدل استاندارد در شتابدهنده بزرگ هادرونی
Abstract:
Neutral current Drell-Yan (DY) lepton-pair production is considered in the framework of the Standard Model Effective Field Theory (SMEFT). Using the open-source fit platform xFitter, we investigate the impact of high-statistics measurements of the neutral current DY (NCDY) forward-backward asymmetry AFB near the weak boson mass scale in the present and forthcoming stages of the Large Hadron Collider (LHC). Besides recovering earlier results on the AFB sensitivity to parton distribution functions, we analyze the precision determination of Z-boson couplings to left-handed and right-handed u-quarks and d-quarks, and explore Beyond-Standard-Model contributions using the SMEFT framework. We comment on the role of the AFB asymmetry for the electroweak SMEFT fit and precision Z-boson physics at the LHC and high-luminosity HL-LHC.
Indico Link: https://indico.hep.ipm.ir/e/h.abdolmaleki2
Meeting Place: Seminar Room, School of Particles and Accelerators, IPM
Link to Join Virtually: https://meet.google.com/bda-vsem-tuv
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://meet.google.com/bda-vsem-tuv
☘ پیاده سازی شبکه های عصبی در TensorFlow (و PyTorch):
راهنمای گام به گام جهت ساخت شبکه عصبی ☘
لینک گزارش
@PDATLAB
راهنمای گام به گام جهت ساخت شبکه عصبی ☘
لینک گزارش
@PDATLAB
Towards Data Science
Implementing Neural Networks in TensorFlow (and PyTorch) | Towards Data Science
Step-by-step code guide on building a Neural Network
Physics Department
Sharif University of Technology
Cosmology Group Weekly Seminars
Seminar 1: Investigating the Homogeneity and Isotropy of the Universe with Large-scale Structure Data and the Consistency of our Motion to CMB
Arefe Rasouli
Department of Physics, Sharif University of Technology
Seminar 2: The study of the Kinematic and Clustering dipole using cosmological large-scale structure data
Haniyeh Tadayoni
Department of Physics, Sharif University of Technology
Seminar 3: How PBHs and NFW dark matter halos change the number of strongly lensed GW events?
Nooshin Torabi
Department of Physics, Sharif University of Technology
یکشنبه 24 تیر 1403، ساعت 10:00
Sunday 14 July 2024 – 10:00 Tehran Time
Hybrid Seminar
دانشکده فیزیک – طبقه پنجم – کلاس 512 Physics Department fifth floor – Room 512 /
https://vc.sharif.edu/ch/cosmology
گزینه ورود به صورت مهمان – Enter as a Guest
physics.sharif.edu/~cosmology/
Sharif University of Technology
Cosmology Group Weekly Seminars
Seminar 1: Investigating the Homogeneity and Isotropy of the Universe with Large-scale Structure Data and the Consistency of our Motion to CMB
Arefe Rasouli
Department of Physics, Sharif University of Technology
Seminar 2: The study of the Kinematic and Clustering dipole using cosmological large-scale structure data
Haniyeh Tadayoni
Department of Physics, Sharif University of Technology
Seminar 3: How PBHs and NFW dark matter halos change the number of strongly lensed GW events?
Nooshin Torabi
Department of Physics, Sharif University of Technology
یکشنبه 24 تیر 1403، ساعت 10:00
Sunday 14 July 2024 – 10:00 Tehran Time
Hybrid Seminar
دانشکده فیزیک – طبقه پنجم – کلاس 512 Physics Department fifth floor – Room 512 /
https://vc.sharif.edu/ch/cosmology
گزینه ورود به صورت مهمان – Enter as a Guest
physics.sharif.edu/~cosmology/
🇬🇧🇯🇵 Postdoc in GW Astronomy, Cardiff, UK and Tokyo, Japan 🇬🇧🇯🇵
The Institute for Cosmic Ray Research hosts the large-scale cryogenic gravitational-wave telescope KAGRA and is actively involved in instrumental design and commissioning, and gravitational-wave data analysis (Hideyuki Tagoshi, Soichiro Morisaki).
The post is full-time and fixed term until March 2027 with a flexible start date.
Salary: 39,347 GBP per annum (Grade 6.32).
IMPORTANT NOTE TO CANDIDATES: It is the University’s policy to use the person specification as a key tool for short-listing and we only invite candidates to interview who clearly evidence that they meet (or partially meet) each of the essential criteria. During the application process you will be asked to attach a supporting statement. This statement must outline how you meet the criteria below and we recommended formatting this by using each criteria as a sub-heading and providing your relevant experience/evidence below each sub-heading. It is crucial that you save your supporting statement with the vacancy number (eg. 1234BR) in the filename as failure to do so may result in it being omitted from your application.
For informal enquiries about the post please contact Vivien Raymond (raymondv[AT]cardiff.ac.uk), Soichiro Morisaki (soichiro[AT]icrr.u-tokyo.ac.jp)
For informal enquiries about working at Cardiff School of Physics and Astronomy please contact PhysicsHR[AT]cardiff.ac.uk
Job Reference: 18835BR
Link to Online Application: https://krb-sjobs.brassring.com/TGnewUI/Search/Home/Home?partnerid=30011&siteid=5460#jobDetails=2169999_5460
Closing date: Tuesday, 20 August 2024
Please be aware that Cardiff University reserves the right to close this vacancy early should sufficient applications be received.
The Institute for Cosmic Ray Research hosts the large-scale cryogenic gravitational-wave telescope KAGRA and is actively involved in instrumental design and commissioning, and gravitational-wave data analysis (Hideyuki Tagoshi, Soichiro Morisaki).
The post is full-time and fixed term until March 2027 with a flexible start date.
Salary: 39,347 GBP per annum (Grade 6.32).
IMPORTANT NOTE TO CANDIDATES: It is the University’s policy to use the person specification as a key tool for short-listing and we only invite candidates to interview who clearly evidence that they meet (or partially meet) each of the essential criteria. During the application process you will be asked to attach a supporting statement. This statement must outline how you meet the criteria below and we recommended formatting this by using each criteria as a sub-heading and providing your relevant experience/evidence below each sub-heading. It is crucial that you save your supporting statement with the vacancy number (eg. 1234BR) in the filename as failure to do so may result in it being omitted from your application.
For informal enquiries about the post please contact Vivien Raymond (raymondv[AT]cardiff.ac.uk), Soichiro Morisaki (soichiro[AT]icrr.u-tokyo.ac.jp)
For informal enquiries about working at Cardiff School of Physics and Astronomy please contact PhysicsHR[AT]cardiff.ac.uk
Job Reference: 18835BR
Link to Online Application: https://krb-sjobs.brassring.com/TGnewUI/Search/Home/Home?partnerid=30011&siteid=5460#jobDetails=2169999_5460
Closing date: Tuesday, 20 August 2024
Please be aware that Cardiff University reserves the right to close this vacancy early should sufficient applications be received.
Brassring
Job Search Welcome | Cardiff University
Search for Internet job openings.
Forwarded from Particle Physics (Fatemeh Irani)
پژوهشگران در سرن، دقت اندازهگیری جرم کوارک بالا را به طور قابل توجهی افزایش دادهاند.
در سال ۱۹۹۵، زمانی که دانشمندان کوارک بالا را کشف کردند، جرم این ذره را بین 151 تا 197 GeV/c2 تخمین زدند که آن را به سنگینترین ذرهی بنیادیِ شناخته شده، تبدیل کرد. همچنین، از آنجاییکه این مقدار یک ورودی کلیدی برای محاسبات مدل استاندارد (برای پیشبینی پارامترهای مربوط به فرآیندهای نادر) بهشمار میآید، دقت اندازهگیری آن حائز اهمیت است.
اکنون کولبریشنهای CMS و ATLAS در LHC، با جمعآوری پانزده اندازهگیری مختلف، دقیقترین مقدار جرم کوارک بالا را تا به امروز، این مقدار گزارش کردهاند:
172.52 ±0.33 GeV/c2
https://physics.aps.org/articles/v17/s57
در سال ۱۹۹۵، زمانی که دانشمندان کوارک بالا را کشف کردند، جرم این ذره را بین 151 تا 197 GeV/c2 تخمین زدند که آن را به سنگینترین ذرهی بنیادیِ شناخته شده، تبدیل کرد. همچنین، از آنجاییکه این مقدار یک ورودی کلیدی برای محاسبات مدل استاندارد (برای پیشبینی پارامترهای مربوط به فرآیندهای نادر) بهشمار میآید، دقت اندازهگیری آن حائز اهمیت است.
اکنون کولبریشنهای CMS و ATLAS در LHC، با جمعآوری پانزده اندازهگیری مختلف، دقیقترین مقدار جرم کوارک بالا را تا به امروز، این مقدار گزارش کردهاند:
172.52 ±0.33 GeV/c2
https://physics.aps.org/articles/v17/s57
Physics
The Most Precise Value of the Top-Quark Mass to Date
Researchers at CERN have significantly increased the precision of the measured value of the top-quark mass, a key input for making standard-model calculations.
Forwarded from انجمن فیزیک ایران
نشست دویست و شانزدهمین باشگاه فیزیک تهران روز سهشنبه دوم مرداد ماه ۱۴۰۳ به صورت حضوری در سالن آمفی تئاتر دانشکده فیزیک دانشگاه تهران برگزار میشود. برنامه ساعت ۱۵:۳۰ با اخبار فیزیک و مسابقه آغاز می شود. سخنران این نشست دکتر سیما قاسمی، کنشگر ارتباطات علم هستند و درباره «آموزش علم یا آموزش دانش؟» صحبت خواهند کرد.
استفاده از باشگاه فیزیک برای همهی علاقهمندان به علم فیزیک آزاد است.
نشانی صفحه باشگاه فیزیک: www.psi.ir/f/bashgah
⏪ وبگاه انجمن فیزیک ایران:
🌍 http://www.psi.ir
✅ به کانال خبرى انجمن فیزیک ايران بپيوندید:
👇👇🏽👇👇🏽👇👇🏽👇
http://t.me/psinews
استفاده از باشگاه فیزیک برای همهی علاقهمندان به علم فیزیک آزاد است.
نشانی صفحه باشگاه فیزیک: www.psi.ir/f/bashgah
⏪ وبگاه انجمن فیزیک ایران:
🌍 http://www.psi.ir
✅ به کانال خبرى انجمن فیزیک ايران بپيوندید:
👇👇🏽👇👇🏽👇👇🏽👇
http://t.me/psinews
✳️ ستاره شناسان 21 ستاره نوترونی را کشف کردند که به دور ستاره های خورشید مانند می چرخند ✳️
لینک گزارش
@PDATLAB
لینک گزارش
@PDATLAB
phys.org
Astronomers discover what may be 21 neutron stars orbiting sun-like stars
Most stars in our universe come in pairs. While our own sun is a loner, many stars like our sun orbit similar stars, while a host of other exotic pairings between stars and cosmic orbs pepper the universe. ...
School of Particles and Accelerators
Journal Club: Experiments & Phenomenology / Hybrid Format
Date:
Monday, Jul 22, 2024 / دوشنبه، 1 مرداد 1403
Time:
11:00 AM - 12:00 PM (Tehran time)
Speaker:
Mr. Behrad Taghavi
Affiliation:
School of Particles and Accelerators, IPM
Title:
What is (conformal) anomaly?
Title in Persian:
نابهنجاری (همدیس) چیست؟
Abstract:
Inspired by the “What is…?” column in the Notices of the AMS, this talk aims to provide an informal, nontechnical exposition of the fundamental ideas behind various characterizations of anomalies. In the first part of the talk, I will offer a brief summary of multiple mathematical approaches to classifying and characterizing anomalies in quantum field theories. The second part will focus on the specific example of conformal anomaly in two dimensions, illustrating the concepts discussed earlier and highlighting connections with 2D induced gravity and AdS3/CFT2 duality whenever possible.
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, Jul 22, 2024 / دوشنبه، 1 مرداد 1403
Time:
11:00 AM - 12:00 PM (Tehran time)
Speaker:
Mr. Behrad Taghavi
Affiliation:
School of Particles and Accelerators, IPM
Title:
What is (conformal) anomaly?
Title in Persian:
نابهنجاری (همدیس) چیست؟
Abstract:
Inspired by the “What is…?” column in the Notices of the AMS, this talk aims to provide an informal, nontechnical exposition of the fundamental ideas behind various characterizations of anomalies. In the first part of the talk, I will offer a brief summary of multiple mathematical approaches to classifying and characterizing anomalies in quantum field theories. The second part will focus on the specific example of conformal anomaly in two dimensions, illustrating the concepts discussed earlier and highlighting connections with 2D induced gravity and AdS3/CFT2 duality whenever possible.
Meeting Place: Seminar Room, School of Particles and Accelerators, IPM
Link to Join Virtually: https://meet.google.com/bda-vsem-tuv
Google
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School of Particles and Accelerators
Special Seminar / Virtual Format
Date:
Monday, Aug 5, 2024 / دوشنبه، 15 مرداد 1403
Time:
10:30 AM (Tehran time)
Speaker:
Prof. Galileo Violini
Affiliation:
Co-chair of the Executive Committee of the Great Caribbean Light Source;
Former UNESCO Representative to Islamic Republic of Iran and Director of Tehran Office
Title:
Synchrotron in the Souths - A Science Diplomacy Challenge
Title in Persian:
سنکروترون در جنوب- یک چالش در دیپلماسی علمی
Abstract:
An advanced light source for research would drive growth in the Wider Caribbean region. In addition to analyzing the need for such a facility to meet Latin America's scientific priorities, the challenges to its construction are discussed. These are very similar to those faced by the African Light Source (AfLS): training of users, ensuring sustainable financing, the possibility of international financial support and the role of international organizations. This perspective of South-South cooperation has attracted the attention and support of other similar facilities, such as SESAME and LNLS, which can play an important role in training and, in the case of GCLS, in project design. The development and success of the corresponding actions, aimed at obtaining political support from the governments of the region and international organizations, mainly UNESCO, may be favored by the current political scenarios in both regions.
Link to Join Virtually: https://www.skyroom.online/ch/ipm-particles/seminar
Special Seminar / Virtual Format
Date:
Monday, Aug 5, 2024 / دوشنبه، 15 مرداد 1403
Time:
10:30 AM (Tehran time)
Speaker:
Prof. Galileo Violini
Affiliation:
Co-chair of the Executive Committee of the Great Caribbean Light Source;
Former UNESCO Representative to Islamic Republic of Iran and Director of Tehran Office
Title:
Synchrotron in the Souths - A Science Diplomacy Challenge
Title in Persian:
سنکروترون در جنوب- یک چالش در دیپلماسی علمی
Abstract:
An advanced light source for research would drive growth in the Wider Caribbean region. In addition to analyzing the need for such a facility to meet Latin America's scientific priorities, the challenges to its construction are discussed. These are very similar to those faced by the African Light Source (AfLS): training of users, ensuring sustainable financing, the possibility of international financial support and the role of international organizations. This perspective of South-South cooperation has attracted the attention and support of other similar facilities, such as SESAME and LNLS, which can play an important role in training and, in the case of GCLS, in project design. The development and success of the corresponding actions, aimed at obtaining political support from the governments of the region and international organizations, mainly UNESCO, may be favored by the current political scenarios in both regions.
Link to Join Virtually: https://www.skyroom.online/ch/ipm-particles/seminar
Speaker
Mohammadreza Zakeri
Affiliation
University of Kentucky
Title of talk
Does the Sun Have a Dark Disk?
آیا خورشید دارای دیسک تاریک است؟
Date and time
Tuesday, August 3rd, 2024 (Mordad 13th, 1403), 5:00 pm (Tehran zone)
Link
https://www.skyroom.online/ch/schoolofphysics/highenergyseminar
Abstract
The Sun’s oblateness has been measured using optical observations. Its gravitational quadrupole moment has been deduced through helioseismology and measurements of its gravitational effects on Mercury’s orbit. The distribution of mass within Mercury’s orbit would only impact the orbital determination, suggesting that discrepancies among various types of assessments may indicate the possible existence of a non-luminous mass. For the first time, we have developed a method to combine these differing measurements to yield new, highly sensitive constraints on the mass distribution within Mercury’s orbit. In this talk, we will show that the most precise measurements indicate the existence of a non-luminous disk within Mercury’s orbit, with a mass significantly heavier than the modeled mass for the circumsolar dust ring observed by the Solar TErrestrial RElations Observatory (STEREO) mission. This suggests a substantial dark matter contribution. Furthermore, the long-standing inconsistency between the element abundances determined from the spectroscopy of the Sun’s surface, and those inferred from its interior through helioseismology, can be reconciled if the Sun formed within a protoplanetary disk. We will discuss how our findings limit the presence of a dark disk or a spherical halo near the Sun and highlight the potential of future orbital measurements of Mercury and near-Sun asteroids to refine these constraints further.
Mohammadreza Zakeri
Affiliation
University of Kentucky
Title of talk
Does the Sun Have a Dark Disk?
آیا خورشید دارای دیسک تاریک است؟
Date and time
Tuesday, August 3rd, 2024 (Mordad 13th, 1403), 5:00 pm (Tehran zone)
Link
https://www.skyroom.online/ch/schoolofphysics/highenergyseminar
Abstract
The Sun’s oblateness has been measured using optical observations. Its gravitational quadrupole moment has been deduced through helioseismology and measurements of its gravitational effects on Mercury’s orbit. The distribution of mass within Mercury’s orbit would only impact the orbital determination, suggesting that discrepancies among various types of assessments may indicate the possible existence of a non-luminous mass. For the first time, we have developed a method to combine these differing measurements to yield new, highly sensitive constraints on the mass distribution within Mercury’s orbit. In this talk, we will show that the most precise measurements indicate the existence of a non-luminous disk within Mercury’s orbit, with a mass significantly heavier than the modeled mass for the circumsolar dust ring observed by the Solar TErrestrial RElations Observatory (STEREO) mission. This suggests a substantial dark matter contribution. Furthermore, the long-standing inconsistency between the element abundances determined from the spectroscopy of the Sun’s surface, and those inferred from its interior through helioseismology, can be reconciled if the Sun formed within a protoplanetary disk. We will discuss how our findings limit the presence of a dark disk or a spherical halo near the Sun and highlight the potential of future orbital measurements of Mercury and near-Sun asteroids to refine these constraints further.
www.skyroom.online
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