سخنران: راضیه احمدیان, دانشگاه شهید بهشتی

12 اردیبهشت 1403
17:30 تا 19:00


Venue: , (Online)

سخنران: شانت شهبازیان

12 اردیبهشت 1403
14:00 تا 15:00

چکیده:

The orthodox many-body theory of atoms, molecules and condensed phases is the electronic structure theory plus the theory of nuclear vibrations and rotations. The basic tent of this theory is the Born-Oppenheimer separation of the electronic and nuclear dynamics through deriving two Schrodinger equations, one for electrons, and the other for nuclei. The electronic Schrodinger equation, which conceives electrons as the sole quantum particles within the external field produced by clamped nuclei, yields the electronic eigenvalues, i.e. the potential energy surfaces, and the electronic eigenfunctions. On the other hand, the nuclear Schrodinger equation, which conceives nuclei as quantum particles experiencing the potential energy surfaces as the effective potentials, yields the eigenvalues and eigenstates of the collective vibrational and rotational modes. An unorthodox but more general reformulation of the many-body theory, called the multi-component quantum chemistry, dismisses the Born-Oppenheimer separation totally and the resulting many-body system is governed by a single multi-component Hamiltonian encompassing all interactions between electrons and nuclei. Theoretically, the resulting multi- component theory contains the orthodox theory as a special case thus one intuitionally expects it must be capable of reproducing the concepts and numerical results derived within the context of the orthodox many-body theory. In contrast, various theoretical arguments and computational studies, particularly in the last two decades, reveal exotic features of the multi-component quantum chemistry theory incompatible with the results derived from the orthodox many-body theory. In this talk I will introduce the basic tents of the multi-component quantum chemistry at a non-technical level as well as some of its paradoxical features by considering some illustrative examples. Some selected applications of the theory are also briefly considered including the status of nuclear quantum-superposed states in molecular systems and the newly discovered positronic bonds.


برای شرکت در این وبینار وارد لینک زیر شده و به صورت میهمان لاگین کنید


https://www.skyroom.online/ch/schoolofnanoscience/weeklyseminars

سخنران: مریم شاه سیاه, اصفهان

12 اردیبهشت 1403
14:00 تا 15:00


Venue: Niavaran, Lecture Hall 1

سخنران: محسن علیشاهیها
(پژوهشگاه دانش های بنیادی)

12 اردیبهشت 1403
13:30 تا 15:00

این سمینار روز چهارشنبه مورخ 12 اردیبهشت ماه 1403 ساعت 13:30 به صورت حضوری در سالن سمینار پژوهشکده نجوم برگزار می شود.

سخنران: آنکه پُل, دانشگاه برمن آلمان

12 اردیبهشت 1403
15:30 تا 17:00


Venue: , (Online)

سخنران: پریسا موسوی؛ دانشگاه یورک

10 اردیبهشت 1403
16:00 تا 18:00

خاص‌گرایی اخلاقی و چشم‌اندازهای اخلاق ماشین

Link: https://philosophy.ipm.ac.ir/

سخنران: دکتر آیدامهین رسولیان - پژوهشکده فیزیک - پژوهشگاه دانشهای بنیادی

9 اردیبهشت 1403
15:00 تا 16:00

کوانتش غشای نورگونه

Link: https://meet.google.com/fnv-dfkk-ghb

سخنران: دکتر سید حسین اسدپور (پژوهشگاه دانشهای بنیادی، پژوهشکده فیزیک)

5 اردیبهشت 1403
11:00 تا 12:00

پدیده های اپتیکی همدوس با نورهای ورتکس


Link: https://meet.google.com/fnv-dfkk-ghb

سخنران: والری لونتس, دانشگاه ایندیان، آمریکا

5 اردیبهشت 1403
16:00 تا 17:00


Venue: , (Online)

سخنران: یوسف ثبوتی
دانشگاه تحصیلات تکمیلی زنجان))

5 اردیبهشت 1403
13:30 تا 15:30

این سمینار روز چهارشنبه مورخ 05 اردیبهشت ماه 1403 ساعت 13:30 به صورت حضوری در سالن سمینار پژوهشکده نجوم برگزار می شود.

سخنران: نجمه کوهستانی, پژوهشگاه دانشهای بنیادی

5 اردیبهشت 1403
12:45 تا 13:45


Venue: Niavaran, Lecture Hall 1

سخنران: جواد ابراهیمی, دانشگاه صنعتی شریف

5 اردیبهشت 1403
14:00 تا 15:00

Entropy of a random variable is a measure of how much a random variable can be losslessly compressed. When certain symbols are allowed to be confused, the notion of graph entropy is used. A central problem in this subject is the question of maximum entropy of a graph and the distribution achieving it. As observed by Changiz-Rezaei and Godsil, this problem is closely related to the notion of fractional chromatic number of graphs and uniform cover of the vertices by maximal independent sets. Simony et al. generalized the notion of graph entropy to other geometric objects known as convex corners. In this talk, we consider the problem of maximum entropy of convex corners. In particular we investigate maximum entropy problem for independent polytopes of matroids and graphs.

Zoom room information is:
https://us06web.zoom.us/j/89600366073?pwd=RMHt0eGdvGtkaDBG1Me3y8bOLgooGh.1
Meeting ID : 896 0036 6073
Passcode : 290109
Venue: Niavaran, Lecture Hall 1

سخنران: S.E. Akrami Sanzigh, University of Semnan

4 اردیبهشت 1403
14:00 تا 15:00

Date and time

Tuesday, April 23rd, 2024 (Ordibehesht 4th, 1403), 2:00 pm (Tehran zone)



Please note it is a hybrid meeting.


Link

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



Abstract
General relativity is over the configuration space and is a Lagrangian mechanics. While quantum mechanics is quantization of classical mechanics over phase space which is a Hamiltonian mechanics. Thus it is difficult to reconciliate these two theories. Therefore, we first reestablish general relativity over phase space of spacetime and then combine it with quantum mechanics and the result is a new mechanics called general quantum mechanics.
In general relativity, the acceleration of a test particle is defined relative to the metric of spacetime while in classical mechanics over phase space the metric has no role in the acceleration. Also in classical mechanics over phase space the measurement of a given observable has no role in the acceleration of a test particle unlike quantum mechanics which obeys Born rule which states that how the measurement makes an impact on the acceleration of the test particle. We reconciliate general relativity with classical mechanics over phase space and quantum mechanics by defining the acceleration of a test particle over phase space relative to the metric of phase space and also relative to a given observable. In general quantum mechanics, we have an equation for the collapse phenomenon which is the counterpart of geodesic equation in general relativity. The collapse equation is a nonlinear modification of the linear Schrödinger equation. We also have an equation for the metric of phase space which is the counterpart of the Einstein field equation and is obtained by the least action principle over an action functional which is similar to the Hilbert action for the Einstein field equation. Namely, the Lagrangian of the action is a new type of curvature different than the Riemann curvature. As a result, we have a proposal for the resolution of the measurement problem in quantum mechanics.

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