Talk detail

Participant	Gionti, Gabriele, S.J.
Institution	Vatican Observatory (Specola Vaticana) - Specola Vaticana - Vatican City - Vatican City - Vatican City

Session	AT7	Accepted		Order	Time
Talk	Oral abstract	Title	Bouncing and Emergent Universes from Hamiltonian Analysis of Asymptotically Safe Quantum Gravity
Coauthors
Abstract	Recent results based on renormalization group approaches to Quantum Gravity suggest that the Newton's and Cosmological constants should be treated as a dynamical variables whose evolution depend on the characteristic energy scale of the system. An open question is how to embed this modified Einstein's theory in the Dirac's theory of constrained systems. In this talk, the Hamiltonian formalism for a renormalization-group scale dependent Newton's and Cosmological 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 modified Einstein Theory of General Relativity via Asymptically Safe Quantum Gravity. Applications to the physics of the Early Universe is explicitly discussed assuming the framework of Asymptotic Safety. In particular, it is shown that in the Minisuperspace case with FLRW metric, RG improved Friedmann equations exibit Bouncing and Emergent Universes solutions. While, in the classical 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) topologies.
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Session	HR2	Accepted		Order	Time
Talk	Oral abstract	Title	The Scientific Legacy of Fr. Christopher Clavius, S.J. up to Fr. Angelo Secchi, S.J.
Coauthors
Abstract	The scientific tradition of the Society of Jesus started at the end of the 16th century with Fr. Cristopher Clavius, S.J. and the third edition of the "Ratio Studiourm", the program of studies for members of the Jesuit order, where a particular importance was given to the study of astronomy, physics and mathematics. A school of Jesuit scientists was promoted by this program of studies and there emerged important figures in science like P. Girolamo Saccheri, S.J. Jesuit missionaries used their scientific formation to enter into unexplored territories. Among them Fr. Matteo Ricci, S.J. and Eusebio Kino, S.J. This tradition continued also during the suppression of the Jesuit order in 1773 with Jesuits like Fr. Ruggiero Boscovich, S.J. and after its restoration in 1814 with Fr. Angelo Secchi.
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