School of Particles and Accelerators

Wednesday Weekly Seminar – Hybrid Format

Date:

Wednesday, Nov 27, 2024 / چهارشنبه، 7 آذر 1403

Time:

11:00 AM - 12:00 PM (Tehran time)

Speaker:

Mr. Hossein Rafiei

Affiliation:

Isfahan University of Technology & IPM

Title:

Design of a high-current, low-emittance electrostatic electron gun for the Iranian Light Source Facility's electron preinjector, and investigation of its electron beam dynamics


Title in Persian:

طراحی یک تفنگ الکترونی الکترواستاتیک با جریان بالا و گسیلندگی پائین برای پیش تزریق گر الکترونی چشمه نور ایران، و بررسی دینامیک باریکه الکترونی آن

Abstract:

The pre-injector of the Iranian Light Source Facility consists of a radiofrequency electron gun, longitudinal and transverse focusing magnets, linear accelerators, and several other ancillary parts. Since the emittance of the ILSF electron beam at the end of the linear accelerators reaches about 8 mm-mrad, we intend to achieve a lower emittance by designing an electrostatic electron gun. Also, electrostatic electron gun pre-injectors do not require alpha magnets and instead have several beam bunchers, contributing to this type's lower emittance.

Reducing the emittance in the electron pre-injector does not have much effect on reducing the emittance in the storage ring. However, the more we can minimize the beam emittance at the beginning of its production, the better. Because the beam emittance may gradually increase along the path. Reducing the emittance of the pre-injector leads to a reduction in the dimensions of the vacuum chamber and the opening of the magnets in the booster ring, and reduces the cost of the magnets and their energy consumption.

In this study, we try to design a high-current electrostatic electron gun with low emittance and investigate the electron beam dynamics and beam emittance with the SPIFFE code and GPT code.

Based on: doi: 10.1103/PhysRevAccelBeams.20.043403 , doi: 10.1016/j.nima.2023.168198

Indico Link: https://indico.hep.ipm.ir/e/h.rafiei

Meeting Place: Seminar Room, School of Particles and Accelerators, IPM

Link to Join Virtually: https://www.skyroom.online/ch/ipm-particles/weekly-seminar

✅ سومین نمایشگاه کاریابی فیزیک‌پیشگان ایران ۱۴۰۳

#اخبار_انجمن_فیزیک_ایران

سومین نمایشگاه کاریابی فیزیک‌پیشگان همزمان با گردهمایی سراسری فیزیک ایران از ساعت ۹ تا ۱۷ روز پنجشنبه ۶ دی ماه ۱۴۰۳ برگزار خواهد شد. قابل توجه شرکت‌ها و سازمان‌های متقاضی شرکت: لطفا در هنگام تکمیل فرم ثبت ‌نام در صفحه نخست اطلاعات شخصی نماینده شرکت/سازمان حاضر شونده در نمایشگاه را در فرم ثبت نام ...

📣 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=4154

⏪ 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

Mohammad Javad Vasli


Affiliation

University of Guilan


Title of talk

Entanglement in Lifshitz Fermion Theories


درهم‌تنیدگی در نظریه‌های فرمیونی لیفشیتز

Date and time

Tuesday, December 3rd, 2024 (Azar 13th, 1403), 2:00 pm (Tehran zone)


Link

https://www.skyroom.online/ch/schoolofphysics/highenergyseminar


Abstract

I will discuss the static entanglement structure in (1+1)-dimensional free Dirac-fermion theory with Lifshitz symmetry, focusing on arbitrary integer dynamical critical exponents. My presentation will examine the behavior of various entanglement measures in both pure and mixed states. I will also highlight the distinctive properties of Dirac-Lifshitz fermions, particularly their locality, which contrasts with the non-local behavior of scalar counterparts and plays a crucial role in shaping their entanglement structure.

زنگ پژوهش دانشکده‌ی فیزیک

💡 | موضوع ارائه: آرایه‌ی رادیویی صبا: نتایج اولیه

🧑🏻‍🏫 | سخنران: رضا رضایی

🏛 | دانشکده‌ی فیزیک، دانشگاه صنعتی شریف

📅 | تاریخ: یکشنبه؛ ۱۴۰۳/۰۹/۱۸

⏰ | ساعت: ۱۳:۳۰ - ۱۴:۳۰

📍| مکان: تالار جناب، طبقه‌ی منفی یک دانشکده‌ی فیزیک

@ResearchatPhysicsSUT

10th ( Proceedings by Springer ) ICICT 2025 | 18 - 21 February 2025 | London, United Kingdom.

Tenth International Congress on Information and Communication Technology : https://icict.co.uk/

ICICT 2025 will be organised in Hybrid Mode [ 18 February 2025 - Physical Mode || 19-21 February 2025 - Digital Mode ]

==========================================================

Manunoscript Submission Important Dates :

- 10th January 2025 : Last Chance for Paper Submission

Publication : All ICICT 2025 presented papers will be published in conference proceedings by Springer LNNS. ISSN: 2367-3370, Series : https://www.springer.com/series/15179

Indexing : Indexed by SCOPUS, INSPEC, WTI Frankfurt eG, zbMATH, SCImago. All books published in the series are submitted for consideration in the Web of Science.

PAPERS SUBMISSION : Submissions of high quality papers in all areas of ICT and its applications.The submissions are handled only through the Easychair website at: https://icict.co.uk/call-for-papers.php#section02

Organise & Managed by : Global Knowledge Research Foundation & G R Scholastic LLP

Venue :

Physical : America Square Conference Centre, London, United Kingdom.

Digital Platform : Zoom

Dear Friends and Colleagues,

ICICT 2025 invites various research associates to discuss the current status, technical challenges, of the future services and applications, as part of a rich conference program including Keynote talks, Paper Presentation as well as Regular and Special Sessions.

The Tenth edition of ICT conference will target state-of-the-art as well as emerging topics pertaining to ICT and its Supported e-Agriculture and Rural Development Technologies, e-Education and Computing Technologies, e-Mining and Inclusive Technologies for implementation for Engineering and Managerial Applications through ICT.

The topics of interest include but are not limited to the following :

Track 1: COMMUNICATIONS
Track 2: INFRASTRUCTURE AND COMPUTATION
Track 3: ENGINEERING APPLICATIONS
Track 4: E-GOVERNANCE AND GOVERNMENT
Track 5: TECHNOLOGY COMPUTATION
Track 6: INTELLIGENT SYSTEMS
Track 7: ELECTRONIC SYSTEMS & CIRCUITS
Track 8: SIGNAL AND IMAGE PROCESSING
Track 9: HEALTH INFORMATICS
Authors are kindly invited to submit their formatted full papers including results, tables, figures and references. All submissions are handled through the Easy Chair at https://icict.co.uk/call-for-papers.php#section02

For any query, Please write mail on support@icict.co.uk or a drop message on https://icict.co.uk/contact. php

Sincerely Yours - Convener ICICT 2025

🔷 چهار درس طلایی

استیون واینبرگ فیزیک‌پیشهٔ برجستهٔ قرن بیستم سه سال پیش در یکی از همین روزهای گرم تابستان درگذشت و میراث بزرگی از آموزش، پژوهش، فرهنگ و عمومی‌سازی علم بر جای گذاشت. متن پیوست ترجمهٔ جستاری است که بر اساس سخنرانی واینبرگ در مراسم دانش‌آموختگی دانشگاه مک‌گیل در سال ۲۰۰۳ تهیه شده است و شامل چهار توصیه به دانشجویانی است که می‌خواهند به کارهای پژوهشی بپردازند.

خلاصهٔ یک‌خطی توصیه‌ها:

۱. هیچ‌کس همه‌ چیز را نمی‌داند، شما هم قرار نیست بدانید.
۲. اگر آن‌قدر شنا بلدید که غرق نشوید به استقبال آب‌های خروشان بروید. از تلاطم نترسید. چیزهای هیجان‌انگیز در همین‌‌جورجاها پیدا می‌شوند.
۳. خودتان را به‌خاطر اتلاف وقت سرزنش نکنید. هیچ‌کس همیشه خلاق نیست. تولد ایده‌های خلاقانه نیاز به زمان دارد.
۴. از یادگیری تاریخ علم غافل نشوید.

فایل پی‌دی‌اف مقاله‌ٔ اصلی را هم می‌توانید از این‌جا بردارید:
https://news.1rj.ru/str/DeranXiv/35


@k1samani_channel

Introduction to Black Hole Thermodynamics

Edward Witten

https://arxiv.org/abs/2412.16795

ادوارد ویتن در چند سال اخیر چند مقاله مروری و مقدماتی با ارزش منتشر کرده است. با وجود دانش ریاضیاتی بسیار پیشرفته ویتن این مقالات کاملا فیزیکی و در حد ریاضیاتی عمومی نوشته شده و برای غالب فیزیک پیشه ها با پس زمینه حداقلی تحصیلات تکمیلی قابل دنبال کردن هستند. برخی از دیگر مقالات مروی ویتن:

A Mini-Introduction To Information Theory
https://arxiv.org/abs/1805.11965

Light Rays, Singularities, and All That
https://arxiv.org/abs/1901.03928

Three Lectures On Topological Phases Of Matter
https://arxiv.org/abs/1510.07698

School of Physics: HEPCo Weekly Seminar Series

Speaker

Haidar Sheikhahmadi

Affiliation

School Of Astronomy, IPM


Title of talk

Looping story in early universe cosmology

داستان حلقه‌های کوانتومی در کیهان اولیه
Date and time

Tuesday, December 31st, 2024 (Dey 11th, 1403), 2:00 pm (Tehran zone)

Link

https://www.skyroom.online/ch/schoolofphysics/highenergyseminar


Abstract

We will review the ongoing debates on loop corrections in the multi-phase inflationary universe and their controversial results. Then, we will show that quantum effects can dramatically affect the long CMB-scale modes after regularizing and renormalizing divergences in different stages of inflationary evolution.

🔹 Title: Root-TTbar Deformations On Causal Electrodynamics Theory

👨‍🏫 Presenter: Hossien Babaie Aghbolagh (Ningbo University)

🕰 Time & Date: Wednesday, January 1st, 2025 (Dey 12th, 1403), 12:00 IRST

📍Participation Link
.
@sth_fum

آزمایش پیشنهادی برای تست کوانتومی بودن گرانش از طریق اندازه گیری ظرفیت گرمایی!

Quantum Gravity Signature in a Thermodynamic Observable

Proposed experiments for obtaining empirical evidence for a quantum denoscription of gravity in a table-top setting focus on detecting quantum information signatures, such as entanglement or non-Gaussianity production, in gravitationally interacting quantum systems. Here, we explore an alternative approach where the quantization of gravity could be inferred through measurements of macroscopic, thermodynamical quantities, without the need for addressability of individual quantum systems. To demonstrate the idea, we take as a case study a gravitationally self-interacting Bose gas, and consider its heat capacity. We find a clear-cut distinction between the predictions of a classical gravitational interaction and a quantum gravitational interaction in the heat capacity of the Bose gas.

https://doi.org/10.48550/arXiv.2412.17460

✅ 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

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

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

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

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.

🇦🇺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

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, 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

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

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.