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SUMMARY:Gravity from Entropy
DTSTART:20260421T140000Z
DTEND:20260421T150000Z
DTSTAMP:20260506T231900Z
UID:indico-event-51723@agenda.infn.it
DESCRIPTION:Speakers: Ginestra Bianconi (Queen Mary University London)\n\n
 Gravity is derived from the Gravity from Entropy (GfE) action coupling mat
 ter fields with geometry. The fundamental idea is to relate the metric of 
 Lorentzian spacetime to a quantum operator\, playing the role of an renorm
 alizable effective density matrix and to describe the matter fields topolo
 gically\, according to a Dirac-Kähler formalism\, as the direct sum of a 
 0-form\, a 1-form and a 2-form. While the geometry of spacetime is defined
  by its metric\, the matter fields can be used to define an alternative me
 tric\, the metric induced by the matter fields\, which geometrically descr
 ibes the interplay between spacetime and matter. The proposed GfE Lagrangi
 an is the Geometric Quantum Relative Entropy (GQRE) between the metric of 
 spacetime expressing the information stored in the true metric that can be
  codified by the metric induced by the matter fields and curvature. The mo
 dified Einstein equations obtained from this action reduce to the Einstein
  equations with zero cosmological constant in the regime of low coupling. 
 By introducing the G-field\, which acts as a set of Lagrangian multipliers
 \, the proposed entropic action reduces to a dressed Einstein-Hilbert acti
 on with an emergent small and positive cosmological constant only dependen
 t on the G-field. The obtained equations of modified gravity remain second
  order in the metric and in the G-field. A canonical quantization of this 
 field theory could bring new insights into quantum gravity while further r
 esearch might clarify the role that the G-field could have for dark energy
  and dark matter. We furthermore show that the geometrical quantum relativ
 e entropy associated to the Schwarzschild metric\, which provides an appro
 ximate solution of the modified gravity equations\, follows the area law f
 or large Schwarzschild radius.\nBianconi\, G.\, 2025. Gravity from entropy
 . Physical Review D\, 111(6)\, p.066001. https://journals.aps.org/prd/abs
 tract/10.1103/PhysRevD.111.066001Bianconi\, G.\, 2025. The quantum relativ
 e entropy of the Schwarzschild black hole and the area law. Entropy\, 27(3
 )\, p.266. https://www.mdpi.com/1099-4300/27/3/266　\n\nhttps://agenda.i
 nfn.it/event/51723/
LOCATION:Aula Conversi (Dipartimento di Fisica-ed. G.Marconi)
URL:https://agenda.infn.it/event/51723/
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