External Talks

Included page "clone:kclstrings" does not exist (create it now) Here you will find a list of talks given by members of our group in other institutions/conferences/workshops/etc. Spring 2021 Feb 1-5: Sameer Murthy CERN Winter School Title: Microstates of supersymmetric black holes in AdS5 Link: https://webcast.web.cern.ch/event/i970492 Jan 8: Damian Galante Fundamental Physics UK (FPUK) first virtual meeting Title: De Sitter horizons and holography Link: https://nms.kcl.ac.uk/neil.lambert/fpuk/events/5/5.html Fall 2020 Dec 17: Damian Galante Young Frontiers Meeting 2020 - Siembra, HolaGrav Title: Comments on de Sitter and holography Link: https://sites.google.com/view/siembra-holagrav-winter/home Dec 2: Dionysios Anninos Title: Degrees of freedom in a de Sitter universe University of La Plata, Buenos Aires, Argentina Link: https://sissa-it.zoom.us/j/2420288468?pwd=SmQ3K3Z3MmM3djNpV0Q1U0I0aHYrdz09 Dec 1: Dionysios Anninos Title: Spheres and de Sitter space Invited seminar at Mons University Nov 23-28: Damian Galante II School of Holography and Entanglement Entropy UNMSM, Lima, Peru Title: An Introduction to AdS2 holography Link: https://vrip.unmsm.edu.pe/gft-iishee/ Nov 25: Nadav Drukker Fields, Gravity and Information 2020 - http://www.fudanfgi2020.com/ Fudan University— Nov 25, 08:30hs (London time) Title: Line operators in 3d and their moduli spaces Abstract: TBA Link: https://us02web.zoom.us/j/82517977440?pwd=Y2ZlUmVDajBoOC9IQjJlWjhKRm1udz09 Oct 21: Sameer Murthy Conference on the Dual Mysteries of Gauge Theories and Gravity IIT Madras, Chennai — Oct 21, 15:00hs (London time) Title: TBA Abstract: TBA Link: https://icsrpis.iitm.ac.in/events/8891/index.html Sep 28: Sameer Murthy SCGP, Stony Brook — Sep 28, 14:30hs (London time) Title: The 1/16-BPS index and supersymmetric phases in 4d N=4 Super Yang-Mills Abstract: I will discuss the superconformal index that counts BPS states preserving two supercharges in 4d N=4 SYM, and more generally in 4d N=1 SCFTs, on S3. This index is captured by a unitary matrix model with purely double trace operators in the action. The AdS/CFT correspondence predicts that the index should have exponential growth at large charges and large N, corresponding to the 1/16-BPS black hole (BH) in AdS5. I will present analytical and numerical analyses of the matrix model which clearly show this expected BH growth. In particular, I will introduce a deformation of the matrix model which allows us to easily find large-N saddle-points and the resultant phase structure. I will show that there is an infinite family of large-N saddle points of the relevant matrix integral, one of which is identified with the black hole. The deformation is closely related to the Bloch-Wigner elliptic dilogarithm, a function introduced by number theorists. Finally, using techniques from representation theory, I will clarify some properties of the finite-N index and show that the index interpolates between counting multi-gravitons at small charge and BHs at large charge. Link: http://scgp.stonybrook.edu/archives/32982 Sep 23: Dionysios Anninos University of Kentucky — Sep 23, 17:00hs (London time) Title: Towards an infrared realization of dS_2 in AdS_2 Abstract: We explore the possibility of embedding a dS_2 universe in the interior of an asymptotically AdS_2 spacetime. We consider the problem macroscopically, discussing various constraints from gravitational models. We also discuss potential microscopic paths guided by the perspective of AdS_2 holography. Link: https://pa.as.uky.edu/tba-66 Sep 16: Damian Galante National University of La Plata (UNLP) — Sep 16, 18:30hs (London time) Title: Reconstructing the bulk geometry in two dimensions Abstract: We consider asymptotically AdS2 geometries that flow away from the pure AdS2 spacetime. We show how to reconstruct properties of the bulk metric and bulk matter couplings using boundary correlation functions of nearly marginal operators. We will use this concrete map to reconstruct bulk features of a microscopic SYK-type model with an exactly solvable RG flow. If time allows, we will finally speculate on possible lessons for dS2. Link: https://sissa-it.zoom.us/j/2420288468?pwd=SmQ3K3Z3MmM3djNpV0Q1U0I0aHYrdz09 Sep 9: Alejandro Cabo-Bizet National University of La Plata (UNLP) — Sep 9, 18:30hs (London time) Title: 1/16th BPS counting, complex saddles and equivariant integration Abstract: I will explain how complex eigenvalue configurations in certain unitary matrix integrals determine the large N growth in the index of 1/16 th BPS operators. Existence of such growth constitutes a microscopic explanation of the origin of the Bekenstein Hawking entropy of the corresponding AdS/CFT-dual black hole solutions. We will do so by combining equivariant integration techniques with Picard-Lefschetz method. The answer we obtain matches recent numerical observations with fluctuations included. The recently noted fluctuations follow from an interference pattern that forms after superposition of the leading complex eigenvalue configurations. Link: https://sissa-it.zoom.us/j/2420288468?pwd=SmQ3K3Z3MmM3djNpV0Q1U0I0aHYrdz09