سخنران: دکتر آرش صادقی پناه - پژوهشگاه دانش های بنیادی، پژوهشکده ذرات و شتابگر

23 مرداد 1404
11:00 تا 12:00

کاواک هارمونیک بالاتر برای حلقه انبارش چشمه نور ایران


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

سخنران: وحید رضوانی

23 مرداد 1404
14:00 تا 15:00

چکیده:


Entanglement and quantum coherence have pivotal roles in the recent era of quantum technology. However, these unique quantum features are very fragile to inevitable system-environment interaction and decay very fast. Hence, there has been a long-standing debate on finding the procedures to diminish or ideally wash out such deleterious effects. Over the years, the many different approaches have been developed for this purpose, from quantum feedback control to optimal control theory. At the first part of the talk, we establish our general scheme, referred to as process-based optimal control, to control optimally the destructive effects of environment on the dynamics of an open system. This state-independent framework enables us to reexamine the important problems in quantum technology from a different perspective including gate simulation, system-environment decoupling and indirect environment engineering. At the second part, we introduce some quantum features such as purity and coherence of a quantum dynamics/process. By using these properties, we construct a feature-based approach to increase the purity and coherence of an open system dynamics at a given final time.



لینک حضور آنلاین در سمینار


https://vmeeting2.ipm.ir/b/nan-gkn-wmh-exh

Link: http://qpm.ipm.ac.ir/

سخنران: Y. Farzan, School of Physics

22 مرداد 1404
14:00 تا 15:00

Date and time

Tuesday, August 12, 2025 (21 Mordad), 2:00 pm (Tehran time)




Link

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


Abstract
We entertain the possibility that transient astrophysical sources can produce a flux of dark particles that induce ultra-high-energy signatures at neutrino telescopes such as IceCube and KM3NeT. We construct scenarios where such “dark flux” can produce meta-stable dark particles inside the Earth that subsequently decay to muons, inducing through-going tracks in large-volume neutrino detectors. We consider such a scenario in light of the O(70) PeV ultra-high-energy muon observed by KM3NeT and argue that because of its location in the sky and the strong geometrical dependence of the signal, such events would not necessarily have been observed by IceCube. Our model relies on the upscattering of a new particle X onto new metastable particles that decay to dimuons with decay lengths of O(100) km. This scenario can explain the observation by KM3NeT without being in conflict with the IceCube data.

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

سخنران: دکتر حسین کریمی - پژوهشکده ذرات و شتابگرها

21 مرداد 1404
11:00 تا 12:00

طراحی محفظه های خلاء چشمه نور سوئیس: چالش ها و راه حل ها


Link: https://www.skyroom.online/ch/ipm-particles/journal-club

سخنران: رامین کرد والش‌آبادی - پژوهشگاه دانش های بنیادی، پژوهشکده ذرات و شتابگر

8 مرداد 1404
11:00 تا 12:00

PDFxTMDLib : یک کتابخانه ++C با کارایی بالا برای توابع توزیع پارتونی همراستا و وابسته به تکانه عرضی


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

سخنران: فروز میرمسعودی

8 مرداد 1404
14:00 تا 15:00

چکیده:

We have considered the spin-1/2 XXZ chain model which is exactly solvable with the Bethe anzats method. It is shown adding a single defect away from edges is sufficient to see a chaos signature in the model. In this work, we have studied the time behavior of the Loschmidt-echo (LE) by considering domain-wall and Neel states as two product initial states and also a Bell state as an entangled initial state. We have used the numerical full diagonalization method to have full spectrum of the model. It is shown that very short times behavior of the LE is independent from defect and initial state, and the decay is quadratic. Moreover, results show that in the chaotic regime and for intermediate times, the exponential decay behavior of the LE shows some changes by removing defect from the chain in the domain-wall and Bell states, while no changes is seen in the Neel state. To get some intuition of these changes, we have addressed the relation between the dynamics of the LE and the local density of states features.
Based on : https://iopscience.iop.org/article/10.1088/1402-4896/ab0582


لینک حضور آنلاین در سمینار


https://vmeeting2.ipm.ir/b/nan-gkn-wmh-exh

Link: http://qpm.ipm.ac.ir/

سخنران: F. Arias-Aragon, National Institute for Nuclear Physics (INFN), Frascati National Laboratory

7 مرداد 1404
14:00 تا 15:00

Date and time

Tuesday, July 29th, 2025 (7 Mordad), 2:00 pm (Tehran zone)




Link

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


Abstract
The ATOMKI collaboration measured excesses in electron-positron production from nuclear transitions of beryllium, helium and carbon nuclei. All these excesses are compatible with the emission of a new boson with mass around 17 MeV, denoted X17. An independent search for this particle, harnessing a particle physics experiment, was performed at the Positron Annihilation into Dark Matter Experiment (PADME), where a positron beam collided against a diamond target expecting to produce resonantly the X17 particle. Given the presumably narrow width of this particle, a precise theoretical computation of the signal shape was required to account for electron motion within the target. After including the theoretical modelling of this effect in their analysis, the PADME collaboration has reported an excess in electron-positron events centered around 17 MeV. This excess was later independently shown to largely reduce the uncertainty on the expected X17 mass when combined with nuclear observables. As a byproduct of these studies, electron motion in large Z materials has been shown to enhance centre-of-mass energy in fixed-target experiments and allow for a new energy scan mechanism relevant for the measurement of the hadronic vacuum polarization contribution to the muon anomalous magnetic moment.

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

سخنران: دکتر منیره احمدپور - دانشگاه تهران

6 مرداد 1404
11:00 تا 12:00

کاوش در پدیده محبوس سازی QCD با استفاده از درهم تنیدگی اسپینی



Link: https://www.skyroom.online/ch/ipm-particles/journal-club

سخنران: A. Maleki, Sharif University of Technology

31 تیر 1404
11:00 تا 12:00

Date and time

Tuesday, July 22nd, 2025 (31 Tir), 11:00 AM (Tehran zone)




Link

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


Abstract


This talk addresses the intersection of physics at the smallest and largest scales, where quantum mechanics meets cosmology. We highlight the relevance of this interplay to foundational problems in both cosmology and high energy physics. Our discussion spans the potential quantum features manifesting at galactic or cosmological scales, as well as the role of quantum interferometry in enabling ultra-sensitive measurements in high-energy experiments. These experimental advances not only push the boundaries of precision measurement (such as the detection of gravitational waves), but also open promising avenues for probing quantum aspects of gravity, one of the most profound unresolved questions in theoretical physics.

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

سخنران: دکتر بهراد تقوی - پژوهشکده ذرات و شتابگرها

30 تیر 1404
11:00 تا 12:00

نابهنجاری (همدیس) چیست؟



Link: https://www.skyroom.online/ch/ipm-particles/journal-club

سخنران: روح الله جعفری

25 تیر 1404
14:00 تا 15:00

چکیده:

We study the impact of noise on the dynamics of entanglement in the transverse-field Ising chain, with the field quenched linearly across one or both of the quantum critical points of the model. Taking concurrence as a measure of entanglement, we find that a quench generates entanglement between nearest- and next-nearest-neighbor spins, with noise reducing the amount of entanglement. Focusing on the next nearest-neighbor concurrence, known to exhibit Kibble-Zurek scaling with the square root of the quench rate in the noiseless case, we find a different result when noise is present: The concurrence now scales logarithmically with the quench rate, with a noise-dependent amplitude. This is also different from the anti-Kibble-Zurek scaling of defect density with quench rate when noise is present, suggesting that noisy entanglement generation is largely independent from the rate of defect formation. Intriguingly, the critical time scale beyond which no entanglement is produced by a noisy quench scales as a power law with the strength of noise, with the same exponent as that which governs the optimal quench time for which defect formation is at a minimum in a standard quantum annealing scheme.


لینک حضور آنلاین در سمینار


https://vmeeting2.ipm.ir/b/nan-gkn-wmh-exh

Link: http://qpm.ipm.ac.ir/

سخنران: دکتر سمیه محمودی - پژوهشگاه دانش های بنیادی، پژوهشکده ذرات و شتابگرها

25 تیر 1404
11:00 تا 12:00

دوشکستی کیهانی: ابزاری برای کاوش در ماهیت مادهً تاریک

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

سخنران: V. Kamali, McGill University

24 تیر 1404
14:00 تا 15:00

Date and time

Tuesday, July 15th, 2025 (24 Tir), 2:00 pm (Tehran zone)




Link

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


Abstract

In this talk, I will explain a model of warm inflation driven by axion-like particles interacting with $U(1)$ gauge fields, with implications for the early universe's thermal evolution. By extending traditional warm inflation models, we introduce a dissipation mechanism through the thermal fluctuations of electromagnetic fields, leading to a non-trivial backreaction on the inflaton's dynamics. Our results are consistent with CMB observations, even for a natural sub-Plankian Axion decay constant $f
Link: https://www.skyroom.online/ch/schoolofphysics/highenergyseminar

سخنران: دکتر فرید تقی نواز - پژوهشکده ذرات و شتابگرها

23 تیر 1404
11:00 تا 12:00

امکان تفسیرهیدرودینامیکی برای نواحی نزدیک به نقاط ثابت غیردمایی



Link: https://www.skyroom.online/ch/ipm-particles/journal-club