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SUMMARY:QFT-Gravity seminar: Sergi Sirera
DESCRIPTION:Testing gravity across scales: from black holes to cosmology\nA
 bstract: I will present phenomenological signatures of scalar-tensor gravi
 ty in two distinct regimes: the strong-field environment near black holes 
 and the nonlinear scales of large-scale structure. Scalar-tensor theories 
 constitute a compelling framework for extending General Relativity and add
 ressing cosmological tensions. However\, tightly constraining these models
  requires robust theoretical predictions. First\, I will show how an addit
 ional scalar degree of freedom alters gravitational wave emission during t
 he black hole ringdown. By calculating the corresponding quasinormal modes
 \, we can extract unique signatures that directly probe the underlying the
 ory. Second\, we will shift to astrophysical scales\, where viable scalar-
 tensor theories must rely on screening mechanisms to evade stringent Solar
  System bounds. I will introduce a unified formalism to simultaneously mod
 el different screening mechanisms (typically studied in isolation). I will
  discuss a new candidate screening mechanism\, as well as ongoing work on 
 the nonlinear interplay between Chameleon and Vainshtein screening.
URL:https://www.imperial.ac.uk/events/214040/qft-gravity-seminar-sergi-sire
 ra/
DTSTART;TZID=Europe/London:20261002T120000
DTEND;TZID=Europe/London:20261002T130000
LOCATION:H503\, Huxley Building\, South Kensington Campus\, Imperial Colleg
 e London\, London\, SW7 2AZ\, United Kingdom
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