IPM Calendar 
Wednesday 8 December 2021   Today  
Events for day: Wednesday 10 November 2021    
           11:00 - 12:00     Wednesday Weekly Seminar - google meet
Propagation of quantum fields on quantum spacetime

School
PARTICLES AND ACCELERATORS

Abstract: After a brief review on the importance of quantum gravity research and the significant results of loop quantum cosmology, we investigate the propagation of quantum fields on the quantized background. We show that when the backreation of the field on the quantum geometry is considered, the emergent semi-classical spacetime will be mode dependent, i.e., a Rainbow spacetime emerges. Properties of such a spacetime will be discussed in cosmological and black hole settings. That mode dependent causes, in particular, a chromatic aberration in the gravitational lensing process and a modified dispersion relation for light.

arXiv:1 ...

           14:00 - 15:00     Combinatorics and Computing Weekly Seminar
Occam's razor and Bayesian statistics: their early history

School
MATHEMATICS

Occam's razor and Bayesian statistics: their early history

Meeting Link:
https://us06web.zoom.us/j/86917547255
Meeting ID: 869 1754 7255 ...

           14:00 - 15:00     Weekly Seminar
Condensed Matter and Statistical Physics Group
Floquet Engineering of Topological Insulators

School
PHYSICS

Abstract:

Recent technological progresses in mid-infrared lasers have established a new route for engineering of the electronic band structure. Indeed, an interplay between the periodicity of lattice and time originated from the oscillating field extends the Hilbert space by inducing the so-called Floquet-Bloch states and enables one to modify the band structure (opening the gaps) and to engineer phase transitions at will by using photon-assisted processes. Fortunately, such light-induced states have been experimentally observed on the surface of irradiated topological insulators, optical lattices, graphene etc. Many striking ...

           16:00 - 17:00     Quantum Computing & Quantum Information Monthly Seminar
Machine learning methods in open quantum systems

School
NANO SCIENCES

Machine learning methods in open quantum systems

Abstract:

Control theory is a powerful tool which gives us a variational framework to calculate an optimized field for the purpose of minimizing/maximizing a physical quantity, for example exchanged heat. There are some traditional methods to employ control theory such as Stochastic Gradient Descendant (SGD) and Krotov. Recently, machine learning methods are also employed in control problems with the aim of improving accuracy and speed of control and optimization processes.
In this talk, I am going to compare the performance of traditional control met ...

           17:30 - 19:30     Mathematical Logic Weekly Seminar
Strong Tree Properties, the Kurepa Hypothesis, and the Continuum

School
MATHEMATICS

In 2010, Christoph Weiss isolated a family of strong tree properties that can be used to characterize strongly compact or supercompact cardinals but can also consistently hold at smaller cardinals. For example, the Proper Forcing Axiom implies that even the strongest of these tree properties, ISP, holds at $omega_2$. In this talk, we will investigate a variety of interactions between these strong tree properties, the existence of (weak) Kurepa trees, and the behavior of the continuum function. Along the way, we will also encounter a variant of Silver's celebrated theorem on cardinal arithmetic dealing with a certain cardinal characteristic of ...