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SUMMARY:Benjamin Muntz - 'What can Solve the Cosmological Constant Problem
 ?'
DTSTART:20261015T070000Z
DTEND:20261015T090000Z
DTSTAMP:20261021T230800Z
UID:indico-event-1440@indico.ibs.re.kr
DESCRIPTION:In this talk I will share some reflections on the cosmological
  constant problem (CCP) and what may possibly solve it. \n \nIn the firs
 t part\, I will present an example of a new mechanism for addressing the p
 roblem of radiative corrections to vacuum energy based on global constrain
 ts arising from a lapse function in a higher-dimensional gravitational the
 ory. Inspired by Horava-Lifshitz gravity\, we consider a 5d spacetime with
  anisotropic scaling along a compact extra dimension\, while preserving Lo
 rentz invariance in 4d. In the deep IR\, the lapse generates a global cons
 traint on the 4d geometry\, closely analogous to vacuum energy sequester (
 VES). Although the two theories differ\, radiative contributions to SM vac
 uum energy nevertheless cancel in a similar fashion at all orders.\n \nIn
  the second part\, I will then reinterpret the CCP from the point of view 
 of (-1)-form global symmetries associated with continuous couplings. We ar
 gue that GR with a cosmological constant actually contains two (-1)-form g
 lobal symmetries. (Note: it is generally argued that quantum gravity shoul
 d not admit any global symmetries!) I will show how flat gauging one yield
 s Henneaux-Teitelboim unimodular gravity\; gauging both leads to the local
  formulation of VES\, which solves the CCP. Building on this intuition\, w
 e propose a general diagnostic for determining whether a gravitational EFT
  admits a CCP. I will also discuss parallels with the strong CP problem in
  QCD\, where topological susceptibility diagnoses the problem.\n \n\nhttp
 s://indico.ibs.re.kr/event/1440/
URL:https://indico.ibs.re.kr/event/1440/
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