IPM Calendar 
Thursday 15 November 2018   Today  
Events for day: Wednesday 14 November 2018    
           11:00 - 13:00     Theoretical Neuroscience Journal Club
A triplet spike-timing-dependent plasticity model generalizes the Bienenstock-Cooper-Munro rule to higher-order spatiotemporal correlations

School
COGNITIVE SCIENCES

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

           11:00 - 12:00     Computational Nanoscience journal club
Using Time-Temperature Superposition for Determining Dielectric Loss in Functionalized Polyethylenes

School
NANO SCIENCES

Using Time-Temperature Superposition for Determining Dielectric Loss in Functionalized Polyethylenes

Abstract:

Using Molecular Dynamics simulations, we probe the effect of various pendant polar groups on the dielectric loss of polyethylene copolymers. The dielectric loss was computed using the autocorrelation function of the total dipole moment of a completely relaxed PE-X sample. Since this calculation is computationally expensive (wall time ? 4200 h), we explore the use of the time-temperature superposition (tTS) principle to make it more tractable. An important point is that short time MD simulations do ...

           13:30 - 15:00     Weekly Seminar
Vacuum decay and bubble nucleation inf(R) gravity

School
ASTRONOMY

In this talk, I first review the concept of vacuum decay in quantum mechanics and field theory. Then I will review our study of vacuum decay and bubble nucleation in models of f(R) higher curvature gravity building upon the analysis of Coleman De Luccia (CDL). We could show that higher curvature terms may have nontrivial effects on the tunneling rate and bubble size. Our main focus is on the Starobinsky model and its higher power extensions though the formalism is rather general.
Based on arXiv:1810.01391
...

           14:00 - 15:00     Lecture
Tangles -vs- Trees

School
MATHEMATICS

The topic of these talks is the structural theory of sparse graphs. More specifically, we study the interplay between highly cohesive substructures, which we figuratively refer to as `tangles', and decompositions over a (graph-theoretic) tree, which we simply call `trees'. At this point, we intentionally leave the meaning of these terms undefined and rely solely on the connotations they may carry.
We are primarily interested in situations in which a certain pair of a tangle and a tree cannot coexist: the existence of the specified substructure makes a decomposition of the desired kind impossible and vice versa. For example, tree-dec ...

           16:00 - 18:00     Neuroimaging Journal Club
Guidelines for reporting an fMRI study

School
COGNITIVE SCIENCES

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