Colloquium@IITGn: Prof. Thanu Padmanabhan: Avatars of Gravity

Published on : 24-Feb-2020
Prof. Thanu Padmanabhan from IUCAA, Pune will be visiting IIT Gandhinagar. He will present a colloquium on 27th Feb. 2020 at Block 1/103, 5 PM. The title of the seminar is:  "Avatars of Gravity"

Prof Thanu Padmanabhan is an internationally acclaimed theoretical physicist known for his seminal contribution in the field of gravitational physics and cosmology. His research work spans a wide variety of topics in Gravitation, Cosmology and Quantum Gravity. He has made several contributions related to the analysis and modeling of dark energy in the universe and the interpretation of gravity as an emergent phenomenon.

Padmanabhan has received several national and international awards including Shanti Swarup Bhatnagar Award (1996), Infosys Science Foundation Prize for Physical Sciences (2009), TWAS Prize in Physics (2011), and Padma Shri in 2007.

Padmanabhan has authored several advanced level textbooks which are used worldwide as standard references. In addition, he has also authored several popular-level science books. His articles for science students in the journal Resonance on various aspects of fundamental physics considered to be a classic in science education in India.

Black Hole Second Law from large D membranes

Published on : 10-Jan-2020
Dr. Arunabha Saha from the University of Geneva will be visiting us from 13th to 15th Jan 2020. He will be delivering a seminar on 14th January.
The details are:

Time and Venue: 2:30 PM- 3:30 PM, Block 6/203

Title: Black Hole Second Law from large $D$ membranes 

Abstract: I will discuss the duality between black hole dynamics and co-dimension one membranes in the limit of spacetime dimensionality tending to infinity. I will then use this duality to find an entropy current on the membrane world volume which captures the second law for the dual black hole in the Einstein -Gauss-Bonnet gravity. I will work up to the second subleading order in 1/D where the non-trivial entropy production starts. This analysis will be up to linear order in the Gauss-Bonnet parameter. I will also present some initial results for a non-perturbative analysis in the GB parameter up to leading order in 1/D. 

Compact binary Coalescences: Constraints on waveforms

Published on : 09-Jan-2020
 Mr. Neev Khera, who is a Ph.D. student at Penn State University will be visiting us on 16th January. He will be delivering a seminar on 16th, the details are:

Venue and Time: Block 5/203, 4:00 PM - 5:00 PM

Title: Compact binary Coalescences: Constraints on waveforms

Abstract: Gravitational-wave detections of compact binary coalescences (CBCs) are reliant on accurate modeling.  With upcoming future detectors, our models must improve by orders of magnitude. Exact general relativity applied to compact binary coalescences (CBCs) gives constraints that the waveforms must satisfy. These constraints can then be used as qualitatively new checks on the accuracy of waveform models. In this talk, we see the derivation of these constraints using the Bondi-Metzner-Sachs (BMS) group and its associated balance laws in the context of CBCs. We also see applications of this work in understanding the issue of angular momentum ambiguities for CBCs in general asymptotically flat spacetimes.  

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