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CATEGORIES:Academic Events
DESCRIPTION:Fr. Gabriele Gionti SJ\, Vatican Observatory\n\nRecent results
based on renormalization group approaches to Quantum Gravity suggest that t
he Newton's and Cosmological constants should be treated as a dynamical var
iables whose evolution depend on the characteristic energy scale of the sys
tem. An open question is how to embed this modified Einstein's theory in th
e Dirac’s theory of constrained systems. In this talk\, the Hamiltonian for
malism for a renormalization-group scale dependent Newton's and Cosmologica
l constants is discussed paying particular attention to Dirac's constraint
analysis. It is shown that the algebra of the Dirac's constraints is closed
under certain conditions. Brans-Dicke theory is also studied as a Dirac’s
Constrained Dynamical System and it is confronted and contrasted with modif
ied Einstein Theory of General Relativity via Asymptically Safe Gravity. A
pplications to the physics of the Early Universe is explicitly discussed as
suming the framework of Asymptotic Safety. In particular\, it is shown that
in the Minisuperspace case with FLRW metric\, RG improved Friedmann equati
ons exibit Bouncing and Emergent Universes solutions. While\, in the classi
cal case\, Emergent universe solutions hold for closed topologies (K=+1)\,
in the sub-Planckian regime they hold also for flat (K=0) and open (K=-1) t
opologies.
DTEND:20181113T211500Z
DTSTAMP:20190422T175723Z
DTSTART:20181113T201500Z
GEO:38.909233;-77.074615
LOCATION:Regents Hall\, 109
SEQUENCE:0
SUMMARY:Physics Colloquium: Bouncing and Emergent Cosmologies from Hamilton
ian Analysis of Asymptotically Safe Quantum Gravity
UID:tag:localist.com\,2008:EventInstance_3910962
URL:http://guevents.georgetown.edu/event/physics_colloquium_gabriele_gionti
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