events


Online Physics Seminar: Holography and the black hole information paradox on 2nd June, 4 - 5 PM.

Published on : 28-May-2020
Title: Holography and the black hole information paradox.

2nd June, 4 - 5 PM.

Speaker: Pushkal Shrivastava

Abstract: Semiclassical gravity leads to apparent inconsistencies and paradoxes, such as the black hole information paradox. Resolution to such paradoxes could potentially offer deep insights into the working of a complete theory of quantum gravity. We will begin our discussions with an overview of the information paradox and some proposed resolutions. We will then shift our attention to the low energy properties of quantum gravity. Subject to some reasonable assumptions on the low energy structure of the theory, we will show that quantum gravity stores information holographically. In particular, we would argue that at any given time, all information about a quantum state can be obtained from observations at spatial infinity. We will analyze how the usual notion of locality emerges if we switch off either gravity or quantum mechanics. Finally, we will discuss how holography resolves many of the paradoxes associated with black holes. If time permits, we will contrast our results to other recent developments on the information paradox.

Reference: https://arxiv.org/abs/2002.02448

About the Speaker: Pushkal Shrivastava is currently a graduate student at ICTS Bangalore. He did his masters from IISER Mohali. His research interests are Holography, Blackhole physics, and string theory.


Colloquium(Online): Conformal invariance in physics by Prof. Sunil Mukhi, IISER Pune

Published on : 26-May-2020
We will have a colloquium (online) by Prof. Sunil Mukhi from the IISER Pune on 28th May, 4:00 - 5:15 PM.
youtube live link: https://www.youtube.com/watch?v=SSLp7EppcZ0

Short Bio: 

He is one of the leading theoretical physicists and string theorists of our country. He has made several fundamental contributions to this subject.  He is the recipient of several prestigious honors: SS Bhatnagar Prize and JC Bose Fellowship. He is a fellow of the Indian National Science Academy, the Indian Academy of Sciences, and The World Academy of Sciences.  He is currently the Dean, Faculty,  of IISER Pune. 

The physics department invites all of you to attend the colloquium on 28th May from 4 Pm - 5.15 PM

Title: Conformal invariance in physics

Abstract:
I will present a fairly broad survey of conformal symmetry in two dimensions and outline its application to various physical problems ranging from statistical systems to quantum Hall physics to topological quantum computing to 3d gravity. Thereafter I will survey some approaches to the classification of conformal-invariant field theories and recent results in this area.
 


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.
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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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