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SUMMARY:A corpuscular model of the gravitational interaction
DTSTART:20181205T090000Z
DTEND:20181205T100000Z
DTSTAMP:20240723T085200Z
UID:indico-event-17388@agenda.infn.it
DESCRIPTION:Speakers: Andrea Giugno\n\n\n We discuss the most recent de
velopments in the field of corpuscular gravity\, with particular empha
sis on models of toy gravitons coupled to static matter currents in a sphe
rically symmetric setting. A system of N bosons can be self-confined i
n a volume of the size of the Schwarzschild radius\, whose geometry is exp
ected to arise as effective description of a ``Newtonian-like” framework
. The classical field reproduces the Newtonian potential generated by th
e source\, while the corresponding quantum state is given by a coherent su
perposition of scalar modes with continuous occupation number. Moreover\,
the study of the Hamiltonian constraint leads to an effective quantum desc
ription of the static gravitational potential up to the first post-Newtoni
an order. We show that one can functionally reproduce the classical Newton
ian results very accurately by employing a coherent quantum state in such
a way to include the first post-Newtonian corrections. Finally\, we establ
ish the natural extension of this scheme to cosmology\, since it can lead
to an inflationary model similar to Starobinsky'sone\, all without requir
ing the introduction of the inflatonfield. All relevant properties are de
termined by the number of gravitons in a cosmological condensate and the c
orrect particle spectrum is recovered\, when the theory is linearisedon a
curved background. The slow-roll out of the inflationary phase is realis
edin terms of pure (corpuscular) gravity\, by understanding the Einstein-H
ilbert term of the action as a perturbation.\n\nhttps://agenda.infn.it/ev
ent/17388/
LOCATION:Hans Bethe Meeting Room (TIFPA)
URL:https://agenda.infn.it/event/17388/
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