IPM Calendar 
Friday 21 June 2024   Today  
Events for day: Wednesday 14 June 2023    
           11:00 - 12:00     Wednesday Weekly Seminar - meeting
Stochastic Inflation and Cosmological Perturbations



Stochastic inflation is an elegant method to study inflation and cosmological perturbations. It is an approach for the dynamics of the long super-horizon perturbations which are affected by smalls-scale quantum perturbations. Our goal is to extend the analysis of stochastic inflation to the picture there is an additional source of stochasticity from the boundaries in the field space. With this motivation in mind, we study various physical and mathematical questions. We next review multiple fields inflation in diffusion dominated regime using stochastic ?N formalism. This setup can be realized towards the final stages ...

           13:30 - 15:00     Weekly Seminar
Cosmological constant problem, in a nutshell


In this talk, first, I will try to discuss the cosmological constant problem, CCP, with a relatively historical approach. Then I will review different interpretations of CC, especially this constant's connection to vacuum energy. Also, I examine and discuss, for instance, the issue of vacuum quantum fields in a de-Sitter space-time, how to regularize it, and the physics of trace anomaly, variance and skewness. ...

           14:00 - 15:00     Weekly Seminar
Thermal relaxation of a heated nanoparticle into the water from atomistic simulation view


Knowing the thermal relaxation of amino acids as the building blocks of bio-molecules and proteins can provide a better understanding of how a bio-molecule dissipates heat when chemical and photochemical reactions occur at specific spots. In this talk, I will show our recent results about the thermal relaxation of 20 naturally occurring amino acids in water and in lysozyme protein using transient nonequilibrium molecular dynamics [1]. The relationship between the cooling time of amino acids to the solvent-accessible surface area of a sample protein in water is discussed. Our finding might help to analyze the function of water-surrounded amino ...

           15:00 - 16:00     Online Seminar on Representation of Algebras
Mutation of Maximal Rigid Objects in 0-Auslander Extriangulated Categories


We introduce the notion of a 0-Auslander extriangulated category in order to study mutations in representation theory. Our aim in this talk is to show that many examples of known mutations can be interpreted as mutations of maximal rigid objects in some 0-Auslander extriangulated categories: cluster tilting mutation, two-term silting mutation, mutation of maximal almost-rigid modules, mutation of intermediate co-t-structures, flips of dissections... This is a collaboration with Mikhail Gorsky and Hiroyuki Nakaoka.

More info:

http://portal.math.ipm.ir/PagesEvents/DisEventsHome.aspx?esbu=15d1151b ...

           17:30 - 19:00     Number Theory Webinar
Weyl Groups in Cantor Dynamics


Arboreal representations of absolute Galois groups of number fields are given by profinite groups of automorphisms of regular rooted trees, with the geometry of the tree determined by a polynomial which defines such a representation. Thus arboreal representations give rise to dynamical systems on a Cantor set, and allow to apply the methods of topological dynamics to study problems in number theory. In this talk we consider the conjecture of Boston and Jones, which states that the images of Frobenius elements under arboreal representations have a certain cycle structure. To study this conjecture, we borrow from the Lie group theory the concep ...

           18:00 - 19:00     Physics Colloquium
Hydrogen Generation via Photoelectrochemical Water Splitting on Nanostructure Semiconductors: Physics and Technology


According to statistics, the total world energy consumption is ~ 5.8 x $10^{20}$ J and the world energy
demand is expected to double by 2050 with the increase in the population (1.12% per year). In this
context, about 83% of today's energy supply originates from fossil fuels (e.g. petroleum, gas and coal)
that are responsible for discharging a large amount of $CO_{2}$ in the environment after their combustion.
The release of $CO_{2}$ accounts for ~ 76% of annual greenhouse gas (GHG) emissions which creates
severe problems for environment and public health such as global warming and climate changes. Thus,