سخنران: N. Khan, Indian Association for the Cultivation of Science-India

12 مرداد 1400
14:00 تا 15:00

Abstract:
The idea of with EW-$\nu_R$ model with additional GeV scale mirror fermions and the extended scalar sector is very appealing. This model has a very rich scalar sector, consistent with various experimental constraints, predicts a 125 GeV scalar with the SM Higgs characteristics satisfying the current LHC Higgs boson data. A complex singlet scalar in this model helps to solve the strong-CP problem without an axion. In this work, we study the detailed scalar mass spectrum, having 125 GeV Higgs-like scalar, which is allowed by the present experimental constraints. Besides explaining the Higgs-like scalar, we find that the imaginary part of the complex singlet scalar can serve as a viable non-thermal feebly interacting massive particle (FIMP)-DM candidate. The DM can naturally be a light sub-MeV particle due to its nature as a pseudo-Nambu-Goldstone (PNG) boson. We identify the region of the parameter space for the Freeze-in mechanism scenario and find that it is consistent with the bounds from relic density and direct-indirect searches.


Date: Tuesday, August 3th -۱۲ مرداد
2 p.m (Tehran time)

Zoom. (click)
Meeting ID: 852 2084 9072
Passcode: 342578

سخنران: ازرا میلر, دانشگاه دوک

7 مرداد 1400
18:00 تا 20:00

Commutative algebra over polynomial rings with real exponents has become important in the past decade because of its entrance into noncommutative and nonrational toric geometry as well as applications in topological data analysis. Both of these settings specifically deal with multigraded modules over real-exponent polynomial rings. But essentially nothing has been known about real-exponent algebra, in part because noetherian hypotheses fail spectacularly: monomial ideals can be uncountably generated; the quotient modulo a monomial ideal can fail to contain even a single copy of the quotient modulo any prime ideal; all positive powers of the unique maximal graded ideal are equal to one another. What should Nakayama's lemma say in a setting where finite generation can never be expected? How can primary decomposition work when modules need not contain copies of quotients modulo primes? Even more fundamentally, what kind of finiteness should prevail given the abject failure of noetherianity? Thinking geometrically about the algebra of monomial ideals with real exponents leads the way to complete, satisfying answers to all of these questions. The lessons learned reflect back on improved ways to think about aspects of ordinary noetherian commutative algebra, such as what it means for a primary decomposition to be minimal and why that question is directly to dual to Nakayama's lemma. The mathematics here is a summary of arXiv:math.AT/2008.03819
If you're interested, here are some warm-up exercises. In the two-variable real-exponent polynomial ring, find an ideal that is minimally generated by uncountably many monomials. Instruct a computer how to store your ideal. Compute a resolution of your ideal. Does your ideal have a primary decomposition? Show that the ideal of all real-exponent polynomials with constant term 0 is maximal and generated by countably many monomials, although it does not admit a minimal generating set. Do the same for the ideal of all real-exponent polynomials with no pure powers of (say) the first variable, but with ``prime" instead of ``maximal". It is not at all necessary to do these exercises to understand the talk, but they'll help you appreciate what's going on.

https://us06web.zoom.us/j/9086116889?pwd=TnhBUllnQlkwYXR4OWMxOHpjUSsyUT09
Meeting ID: 908 611 6889
Passcode: 210810

سخنران: David Fuseau (Subatech - University of Nantes)

6 مرداد 1400
11:00 تا 12:00



معادله حالت ماده کوارکی با برهمکنش قوی در دما و پتانسیل شیمیایی متناهی در مدل

PNJL

سخنران: M. Sebtosheikh, School of Physics

6 مرداد 1400
14:00 تا 15:00

Abstract:

Active matter is referred to a wide class of nonequilibrium systems, whose constituent particles use ambient free energy and convert it to self-propelled motion. Such active particles are commonplace in biology and include microswimmers such as bacteria, algae and spermatozoa that swim in fluid media. Active particles are also made artificially and serve numerous applications across the whole range of nano to micrometer scales, with the relevant examples furnished by self-propelled nano and micromachines. Due to its out-of-equilibrium nature and rich theoretical and experimental aspects, active matter has attracted a lot of attention from physicists in recent years. In our recent works, we have studied the active pressure and effective interactions experienced by external bodies (such as colloidal inclusions) immersed in an active fluid, consisting specifically of active Brownian disks or rods. We have thus uncovered salient effects due to permeability of the inclusions, spatial heterogeneity of the motility field experienced by the self-propelled particles, and shape of the self-propelled particles themselves.


Date: Wednesday, July 28, 2021 / چهارشنبه، ۶ مرداد 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: مهرداد میربابایی، ICTP

5 مرداد 1400
15:00 تا 16:00

دو درس‌ از تفسیر هنگردی گرانش

سخنران: M. Mirbabayi, ICTP & Stanford

5 مرداد 1400
15:00 تا 16:00

Abstract:

Some theories of gravity are thought to be dual to an ensemble of quantum systems. I will talk about how this interpretation can teach us about gravity. First, I will comment on the constraints from the ``moments problem'' and application of that in some simple 2-dimensional theories of gravity. Second, I will use the duality between JT gravity and a matrix ensemble (due to Saad, Shenker, and Stanford) to compute the low-temperature entropy of JT gravity.



Date: Tuesday, July 27th -۵ مرداد

3 p.m (Tehran time)





Zoom. (click)

Meeting ID: 814 2211 5396

Passcode: 462136

سخنران: زهرا پویان راد، دانشگاه صنعتی امیرکبیر

4 مرداد 1400
11:00 تا 12:00

شتابدهنده
intra-line
مورد استفاده در
IOERT
توسعه، وضعیت فعلی و برنامه‌های آینده

سخنران: ملیحه یوسف زاده, دانشگاه اصفهان

31 تیر 1400
11:00 تا 13:00

The concept of base is crucial to study representations of affine Lie (super)algebras. In 2010, this concept was defined by V. Serganova. In her definition, the algebraic structures get involved. We define a base in a combinatorically manner and show that this new definition coincides with the previous one for twisted affine Lie superalgebras and then classify them.

https://zoom.us/j/9086116889?pwd=TnhBUllnQlkwYXR4OWMxOHpjUSsyUT09
Meeting ID: 908 611 6889
Passcode: 210810

سخنران: V. Kamali, Bu-Ali Sina(Avicenna) University (BASU)

29 تیر 1400
14:00 تا 15:00

Abstract:

Axion warm inflation has been introduced as an alternative to standard (cold) inflation. Coupling between inflaton (axion) field and gauge fields changes the evolution of scalar field even at the background level. It was discussed that the system with this coupling can be thermalized inherently and is protected against tachyonic instability. I will discuss that this scenario is compatible with observation and is in the landscape of quantum gravity conjectures.



Date: Tuesday, July 20th -۲۹ تیر

2 p.m. - 3 p.m. (Tehran time)

Zoom. (click)

Meeting ID: 852 2084 9072

Passcode: 342578