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Faculty Seminar
Speaker: Prof. Chethan Krishnan
Title: Fuzzballs and Random Matrices
Date and Time: 15th Feb 2023, Wednesday 2:30 PM
Venue : LH-3
Abstract:
The fuzzball proposal is a controversial idea in string theory that claims that the true nature of black holes is that spacetime "stops" at the horizon. It has some encouraging features, but also some discouraging ones. One of the discouraging features is that (it is generally believed that) the fuzzball paradigm cannot realize the expectation that black holes are quantum chaotic systems, highly efficient at scrambling information. In order to satisfy this expectation, fuzzballs will have to have the spectral features of a random matrix, which is supposed to be challenging. In this talk, I will discuss an extremely simple calculation that suggests that this expectation is likely wrong, and that the fuzzball paradigm almost certainly can incorporate the key features of random matrix spectra. The calculation also suggests interesting new ideas about random matrices and the nature of their spectra.
Title : Searches for double Higgs and Dark Matter at Compact Muon Solenoid experiment (CMS)
Title : Searches for double Higgs and Dark Matter at Compact Muon Solenoid experiment (CMS)
Speaker : Prof. Jyothsna Rani Komaragiri
Date : Thursday, 12th December 2019 2:30 pm.
Venue : LH-3, New Physical Sciences Building
Abstract:
Experimental High Energy Physics program is a new initiative at IISc. IISc recently completed 3 years of being part of Compact Muon Solenoid (CMS) experiment at CERN, Geneva, Switzerland. In this talk, I will introduce the basics of particle physics analysis using the data collected by the CMS experiment at Large Hadron Collider (LHC). I will also discuss two interesting hot topics at CMS which I work on: Searches for the Double Higgs to probe the self-coupling of Higgs boson and Searches for Dark Matter in the final state containing a pair of bottom quarks.
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Title : Hunt for new physics in colliders: Challenges and opportunities
Title : Hunt for new physics in colliders: Challenges and opportunities
Speaker : Prof. Biplob Bhattacherjee
Date : Thursday, 21st November 2019 2:30 pm.
Venue : LH-3, New Physical Sciences Building
Abstract:
In this non-technical talk, I will give a general overview of the search strategy of new particles in collider experiments. The Run-II of LHC has ended, and no hint of new physics has been found yet. The focus of searches is shifting from low-hanging fruits towards more unconventional signatures. This poses several challenges, which will be discussed in this talk.
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Title : The QCD Chiral Phase Transition from Lattice QCD
Title : The QCD Chiral Phase Transition from Lattice QCD
Speaker : Prof. Prasad Hegde
Date : Thursday, 31st October 2019 2:00 pm.
Venue : LH-3, New Physical Sciences Building
Abstract:
The QCD vacuum is characterised by two features, namely confinement and chiral symmetry breaking. At high temperatures, we now know that nuclear matter undergoes a transition to a deconfined and chirally symmetric phase which we call the quark-gluon plasma. The nature of this phase transition has been the subject of extensive study for the last several decades. Due to the non-perturbative nature of the system one approaches the problem either through the study of models which share some of the features of QCD, or through ab initio numerical calculations i.e. lattice QCD. Thanks to these studies, it is now known that the transition is a crossover transition. However it is strongly believed that this transition becomes a genuine phase transition in the limit that some or all of the quark masses go to zero. In this talk, we will provide an overview of the known results and also present some new results that could shed further light on this topic.
Talk slides can be downloaded from here
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Title : Towards Holography in Flat Space
Title : Towards Holography in Flat Space
Speaker : Prof. CHETHAN KRISHNAN
Date : Thursday 19th September 2019 2:30 pm.
Venue : LH-3, New Physical Sciences Building
Abstract:
I will discuss a general approach to encoding dynamics in a region of space in terms of correlations at the boundary of that region, and the possibility of using this strategy to define semi-classical holography for flat space.
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Title: A New Approach to the Method of Regions
Title: A New Approach to the Method of Regions
Speaker: Prof. B. Ananthanarayan
Date : Tuesday 6th August 2019 3:30 pm.
Venue: LH-3, New Physical Sciences Building
Talk slides can be downloaded from here
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Title: The parity odd structure of conformal field theories in d=3
Title: The parity odd structure of conformal field theories in d=3
Speaker: Prof Justin R. David
Date : Tuesday 12 March, 2:30 pm.
Venue: LH-3
Abstract:
Conformal field theories in d=3 admit parity odd structures in three point functions involving conserved currents. We first use the average null energy condition to obtain bounds on the structure constants of these three point functions. We then study the implications of the parity odd structure for bootstrap in these theories and show the existence of a new class of composite operators at large spin.
Finally we derive the bounds on the structure constants using crossing symmetry, analyticity and reflection positivity. This serves as a consistency check of the contributions of the parity odd structure to the bootstrap equations.
Talk slides can be downloaded from here
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