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SUMMARY:Quantum Gravity in the Wild: Black Hole Echoes\, the Big Bang\, an
 d a Cosmic Glitch
DTSTART:20260821T120000Z
DTEND:20260821T130000Z
DTSTAMP:20260823T231000Z
UID:indico-event-351@indico.fzu.cz
DESCRIPTION:Speakers: Niayesh Afshordi (University of Waterloo & Perimeter
  Institute\, Canada)\n\nAbstract: \n\nGeneral relativity describes the Un
 iverse with extraordinary success\, yet black hole horizons\, the Big Bang
 \, and cosmic acceleration point toward regimes where its classical descri
 ption may be incomplete. Can observations turn quantum gravity into an emp
 irical science?\nI will discuss three possible windows. Quantum structure 
 near black-hole horizons may produce delayed gravitational wave “echoes
 ” and departures from the Kerr geometry. In the early Universe\, the qua
 ntum running of couplings in quadratic gravity can generate inflation and 
 make testable predictions for the cosmic microwave background. At late tim
 es\, DESI’s apparent preference for evolving dark energy might instead r
 eflect a “cosmic glitch in gravity”: a small mismatch between the stre
 ngth of gravity measured locally and on cosmological scales. A recent CMB 
 and DESI analysis finds cosmological gravity to be roughly one percent wea
 ker than Newtonian gravity.\nIntriguingly\, the inferred glitch is of the 
 same order as the inverse de Sitter scrambling time in Hubble units. The s
 ame logarithmic dependence on horizon entropy controls the black-hole echo
  delay\, suggesting that quantum horizons might leave related observable i
 mprints across vastly different scales.\n \n\n \nThe seminar will be hel
 d in the Dvořák hall\, FZU\, Pod Vodárenskou věží 1\, Prague.\nLocat
 ion: https://goo.gl/maps/wEf7PsiLimSXMZhE9\n \nThe seminar will be also a
 vailable via ZOOM video conference system:\nMeeting ID: 674 9629 6646Passc
 ode: 575511\nor join meeting via direct ZOOM link\n \n\nhttps://indico.f
 zu.cz/event/351/
URL:https://indico.fzu.cz/event/351/
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