سخنران: K. Dimopoulos, Lancaster University

5 بهمن 1400
14:00 تا 15:00

Date and time
Tuesday, 25th of January, 2022 (5th of Bahman, 1400), 2:00 pm (Tehran zone)

Link
https://us02web.zoom.us/j/86984492174?pwd=QmozNTlZRnJLb3pKb0lpNlhwSjFwQT09

Meeting ID: 869 8449 2174
Passcode: 662580

Abstract
Inflation is the most compelling proposal which explains the fine-tuning of the initial conditions of the Universe's history and also gives rise to the primordial density perturbations that source the formation of galaxies and galaxy clusters. Observations suggest that the Universe is engaging at present in a late inflation period, driven by some exotic substance called dark energy, also called quintessence if it is a suitable scalar field. Quintessential inflation is a framework that unifies both primordial and late inflation. I will discuss what the advantages of quintessential inflation are and I will present a compelling way to realize it in the framework of Palatini modified gravity. I will put emphasis on a special period of the history of the Universe, when the kinetic energy density of the inflaton field is dominant, and how this may generate a spike in the primordial gravitational waves. I will also discuss specific predictions on the barotropic parameter of dark energy and its running, to be probed in the near future by the EUCLID and Nancy Grace Roman space telescopes

سخنران: اسماعیل آراسته راد , آی پی ام

5 بهمن 1400
16:30 تا 18:00

Rapoport-Zink spaces for p-divisible groups are local counterparts for Shimura varieties. According to the dictionary between function fields and number fields, they correspond to the RZ-spaces for local P-shtukas. We review the construction of these moduli spaces and then discuss our approach for computing the semi-simple trace of Frobenius on their (nearby-cycles) cohomology.

https://zoom.us/join
Meeting ID: 9086116889
Passcode: 362880

سخنران: ایگناسیو تروخیلو دکتر
کنگره بین المللی فضانوردی

5 بهمن 1400
14:30 تا 16:00

این سمینار روزسه شنبه مورخ 5 بهمن ماه ساعت 13:30 به صورت آنلاین برگزار می شود.

سخنران: ,

4 بهمن 1400
16:30 تا 18:00

سخنران: نفیسه مصباح|، پژوهشگاه دانش های بنیادی

4 بهمن 1400
11:00 تا 12:00

چشمه پوزیترونی برای پروژه کلیک و برخورد دهنده های دیگر

سخنران: الهه الهی
دانشگاه تهران

30 دی 1400
11:00 تا 12:00

https://www.skyroom.online/ch/arashfj/weekly-seminar-ipm-bio

سخنران: احمد مشعل، طرح چشمه نورایران

29 دی 1400
11:00 تا 12:00

اثرات ابزارهای الحاقی بر باریکه الکترونی ذخیره شده در چشمه‌های نور سنکروترونی

سخنران: محمدرضا آیراملو
دانشگاه هایدلبرگ

29 دی 1400
13:30 تا 15:00

این سمینار روزچهارشنبه مورخ 29 دی ماه ساعت 13:30 به صورت آنلاین برگزار می شود.

سخنران: M. Amini, University of Isfahan

29 دی 1400
14:00 تا 15:00

Abstract:
This is talk about the dynamics of the generalized Rosenzweig-Porter model, which is known to possess three distinct phases: ergodic, multifractal and localized phases. Our focus is on the survival probability R(t), the probability of finding the initial state after time t . In particular, if the system is initially prepared in a highly-excited non-stationary state (wave packet) confined in space and containing a fixed fraction of all eigenstates, we show that R(t) can be used as a dynamical indicator to distinguish these three phases. Three main aspects are identified in different phases. The ergodic phase is characterized by the standard power-law decay of R(t) with periodic oscillations in time, surviving in the thermodynamic limit, with frequency equals to the energy bandwidth of the wave packet. In multifractal extended phase the survival probability shows an exponential decay but the decay rate vanishes in the thermodynamic limit in a non-trivial manner determined by the fractal dimension of wave functions. Localized phase is characterized by the saturation value of R(t →∞)=k, finite in the thermodynamic limit N→∞ , which approaches k=R(t →0) in this limit.


Date: Wednesday, January 19, 2022 / چهارشنبه، ۲۹ دی ۱۴۰۰

Time: 14:00-15:00

To join the webinar, please follow this link:
https://www.skyroom.online/ch/schoolofphysics/condensed-matter-and-statistical-physics
and log in as guest.

Organized by: Condensed Matter and Statistical Physics Group, School of Physics (IPM)

Queries about this event should be addressed to Dr. A. Faridi at azadeh.faridi@ipm.ir

سخنران: V. Mukhanov, Ludwig Maximilian University

28 دی 1400
14:00 تا 15:00

Date and time
Tuesday, 18th of January, 2022 (28th of Dey, 1400), 2:00 pm (Tehran zone)

Link
https://us02web.zoom.us/j/86984492174?pwd=QmozNTlZRnJLb3pKb0lpNlhwSjFwQT09

Meeting ID: 869 8449 2174
Passcode: 662580

Abstract
We assume that the points in volumes smaller than an elementary volume (which may have a Planck size) are indistinguishable in any physical experiment. This naturally leads to a picture of a discrete space with a finite number of degrees of freedom per elementary volume. In such discrete spaces, each elementary cell is completely characterized by displacement operators connecting a cell to the neighboring cells and by the spin connection. We define the torsion and curvature of the discrete spaces and show that in the limiting case of vanishing elementary volume the standard results for the continuous curved differentiable manifolds are completely reproduced.