Talk detail

Participant	Garattini, Remo
Institution	University of Bergamo - Viale Marconi 5 - Dalmine (Bergamo) - - Italy

Session	AT3	Accepted	Yes	Order	8	Time	16:50 - 17:10	15' + 5'
Talk	Oral abstract	Title	Self Sustained Traversable Wormholes in Modified Gravity Theories
Co-authors
Abstract	We consider the possibility that wormhole geometries are sustained by their own quantum fluctuations, in the context of Non Commutative Geometry Theories and Gravity's Rainbow models. More specifically, the energy density of the graviton one-loop contribution to a classical energy in a wormhole background is considered as a self-consistent source for wormholes. In this semi-classical context, we consider the effect of a smeared Schwarzschild source on the traversability of the wormhole from one side and of the Rainbow's functions from the other side. A comparison between the models on the effective traversability is discussed.

Session	ST1	Accepted	Yes	Order	4	Time	14:59 - 15:16	15' + 2'
Talk	Oral abstract	Title	Finite Zero Point Gravitational Energy in the context of Modified Dispersion Relations
Co-authors	Gianluca Mandanici
Abstract	We compute the Zero Point Energy in a spherically symmetric background distorted at high energy as predicted by Gravity's Rainbow. In this context we setup a Sturm-Liouville problem with the cosmological constant considered as the associated eigenvalue. The eigenvalue equation is a reformulation of the Wheeler-DeWitt equation. We find that the ordinary divergences can here be handled by an appropriate choice of the rainbow's functions, in contrast to what happens in other conventional approaches. A final discussion on the connection of our result with the observed cosmological constant and particle propagation is also discussed.