IPM Calendar 
Wednesday 16 October 2019   Today  
Events for day: Wednesday 10 July 2019    
           13:30 - 15:00     Weekly Seminar
Evolution of galaxies in the different dynamical halo state, observation and simulation


In this talk, I will review my recent studies in different categories of observation and simulations. Observationally, to show the results of the stellar populations of the brightest group galaxies (BGGs) in groups whose halos have different dynamical states, using observational data from the GAMA and SAMI surveys. In Simulations, we describe a physical model of the outflows produced as a result of gas accretion onto a black hole, and the resultant changes to star formation rates and efficiencies in galaxies, using the Radio-SAGE semi-analytic galaxy formation model. We show the characteristic growth of massive galaxies influenced by AGN feed ...

           14:00 - 16:00     Seminar
Cognitive Musicology, Part II


School of Cognitive Sciences, Institute for Research in Fundamental Sciences (IPM),
Opposite the ARAJ, Artesh Highway, Tehran, Iran on map

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           15:00 - 16:00     Weekly Seminar
Swampland conjecture; Present and early time cosmology


Abstract: Theoretical aspects of an effective field theory of inflation and dark energy can be constrained by string swampland conjecture as well as the observational aspects of inflation models which can be constrained by observational data. Some models roll out by data and some other by theoretical constraints. The main contradiction between EFT in early cosmology and string swampland is not slow-roll part of inflation as discussed in the literature but is the reheating. Reheating connects the inflation to the radiation dominated era. Therefore it is an important part of early cosmology which rolls out by swampland conjecture. Warm inflati ...

           15:30 - 16:30     Geometry and Topology Weekly Seminar
Modular Vector Fields and Calabi-Yau Modular Forms


In this lecture we introduce a spacial moduli space $sf T$ of the pairs formed by definite Calabi-Yau $n$-folds (arising from the Dwork family) along with $n+ 1$ differential $n$-forms. We observe that there exists a unique vector field $ extsf{R}$ on $sf T$, called modular vector field, satisfying a certain equation involving the Gauss-Manin connection. It turns out that the $q$-expansion (Fourier series) of the components of a solution of $sf R$, which are called Calabi-Yau modular forms, has integer coefficients, up to multiplying by a constant rational number. In particular, in the case of elliptic curves and $K3$-surfaces, where $n= ...