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SUMMARY:HEP Colloquia 2026
DTSTART:20260128T133000Z
DTEND:20260128T143000Z
DTSTAMP:20260509T064100Z
UID:indico-event-50109@agenda.infn.it
CONTACT:hepcolloquia@ca.infn.it
DESCRIPTION:Speakers: Andrea Pierfrancesco Sanna (Istituto Nazionale di Fi
 sica Nucleare)\n\nThe Fellowship of the Curvatures: f(R) meets Gaus
 s-Bonnet \nGeneral Relativity is expected to break down in the high-curva
 ture regime. Beyond effective field theories with higher-order operators\,
  it is crucial to identify consistent nonperturbative theories including h
 igher-curvature terms. Two well-studied cases are f(R) gravity and Einstei
 n–dilaton–Gauss–Bonnet (EdGB) gravity. The former shares GR's vacuum
  solutions\, while the latter faces well-posedness issues in the strong-co
 upling regime. We show that combining them yields genuinely new phenomena 
 beyond simple superposition. This framework naturally extends EdGB gravity
  to include arbitrary higher-curvature terms. Focusing on quadratic and qu
 artic corrections\, we find: (i) black holes are modified by f(R) terms\, 
 unlike in pure EdGB\; (ii) the solutions preserve key nonperturbative EdGB
  features\, such as minimum mass and multiple branches\; (iii) a mechanism
  suppresses Ricci-scalar divergence in the interior\; yet (iv) the singula
 rity and elliptic regions remain similar to EdGB. Thus\, adding higher-ord
 er terms does not resolve the theory's ill-posedness at the nonperturbativ
 e level (based on: arXiv:2510.17965).\n \n\nhttps://agenda.infn.it/event/
 50109/
LOCATION:Sala Consiliare (Department of Physics)
URL:https://agenda.infn.it/event/50109/
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