IPM Calendar 
Saturday 3 June 2023   Today  
Events for day: Wednesday 25 May 2022    
           11:00 - 12:00     Weekly Seminar
Condensed Matter and Statistical Physics Group
Experimentally simulating unexplored regimes of quantum walks via patterned photonic metasurfaces


The ability to control the couplings between either confined or propagating optical modes is the basis of photonic simulators. Reproducing temporally-long evolutions of particles across large lattices is a challenging task, as required setups are complex and lossy. We proposed a novel method to do a photonic quantum walk, even hundreds of steps, by propagating a light beam through a few birefringent optical elements. We achieved up to 320 timesteps of a one-dimensional quantum walk, far beyond state-of-the-art experiments [1].
In this talk, I will introduce an optical element which we named it g-plate. It is a pattern ...

           13:30 - 15:00     Weekly Seminar (Online)
Effective field theory of cosmological perturbations: The role of vector fields


Cosmological perturbations play essential roles in modern cosmology and the EFT approach provides a universal description of them at the scale of interest.
In this talk, I will first review the well-known EFT of scalar-tensor cosmology which unifies scalar-tensor theories. Then, I will present a new EFT based on vector-tensor cosmology.
This new EFT not only serves as a unified description of vector-tensor theories but also highlights universal differences between the scalar-tensor and the vector-tensor theories.

To join the seminar, please click on the following link

           14:00 - 15:00     Combinatorics and Computing Weekly Seminar
Space of Complexity of Estimating the Maximum Matching Size


In this presentation, I will talk about the recent results on the maximum matching problem in the data stream model. The main focus of the talk will be on the algorithms for estimating the maximum matching size and the related space lower bounds for graphs with bounded arboricity such as planar graphs.

To get more information about the Combinatorics and Computing Weekly Seminar and webinars Zoom link, join the following google group:
https://groups.google.com/g/ipmccs ...

           18:00 - 19:00     Physics Colloquium
How living matter self-organizes while breaking action-reaction symmetry


There are many ways to study life, and one that is particularly appealing to physicists is regarding it as self-organized active soft matter that is away from equilibrium ``just the right way. In this Colloquium, I will discuss this notion, and provide a number of examples of how we can begin to put together simple systems - from basic ingredients that we fully understand - that would exhibit the kind of active behaviour we find in living systems. In particular, I will discuss the general class of chemical activity both as the source of non-equilibrium drive and the underlying mechanism for self-organization. Cells and microorganisms produc ...