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SUMMARY:Shubham Maheshwari (Groningen)
DTSTART:20201022T140000Z
DTEND:20201022T150000Z
DTSTAMP:20260423T005757Z
UID:HEPTUW/9
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/HEPTUW/9/">S
 table\, ghost-free solutions in UV non-local gravity</a>\nby Shubham Mahes
 hwari (Groningen) as part of HEP seminars TU Wien (Vienna)\n\n\nAbstract\n
 I consider higher derivative\, UV modifications to GR. In particular\, I w
 ill focus on a specific kind of string theory-inspired higher derivative g
 ravity where one includes derivatives to all orders in the action. First\,
  I will discuss how such a non-local theory of gravity admits stable\, non
 -singular bouncing solutions in the absence of matter. Moreover\, around t
 his bouncing background\, there exists only one propagating (and ghost-fre
 e) scalar mode\, and no vector or tensor modes. Next\, I will discuss the 
 general analysis of scalar-vector-tensor perturbations in non-local gravit
 y - in particular\, I will show how non-local gravity is ghost-free around
  (A)dS and certain non-maximally symmetric backgrounds\, and how certain (
 A)dS backgrounds have special physical spectra in that the propagating deg
 rees of freedom are different from usual expectations.\n
LOCATION:https://researchseminars.org/talk/HEPTUW/9/
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