MG15 - Talk detail |
|
Participant |
Garattini, Remo | |||||||
|
Institution |
Universita degli Studi di Bergamo - Viale Marconi, 5 - Dalmine (Bergamo) - Lombardia - Italy | |||||||
|
Session |
BH5 |
Accepted |
|
Order |
Time |
|||
|
Talk |
Oral abstract |
Title |
Black Hole Thermodynamics and Gravity’s Rainbow | |||||
| Coauthors | ||||||||
|
Abstract |
We consider the effects of rotations on the calculation of some thermodynamical quantities like the free energy, internal energy and entropy. In ordinary gravity, when we evaluate the density of states of a scalar field close to a black hole horizon, we obtain a divergent result which can be kept under control with the helpof some standard regularization and renormalization processes. We show that when we use the Gravity's Rainbow approach such regularization/renormalization processes can be avoided. A comparison between the calculation done in an inertial frame and in a comoving frame is presented. |
|||||||
Pdf file |
||||||||
|
Session |
AT3 |
Accepted |
|
Order |
Time |
|||
|
Talk |
Oral abstract |
Title |
Traversable Wormholes and Yukawa Potentials | |||||
| Coauthors | ||||||||
|
Abstract |
Since Yukawa corrections to Newton potentials appear in some modified theories of gravity, we explore some aspects of traversable wormholes with a shape function having a Yukawa-like profile and related generalizations. These aspects also include the introduction of some equations of state. More specifi cally, we consider an equation of state in which the sum of the energy density and radial pressure is proportional to a Yukawa profile. In some cases, we will show that the specifi c wormhole solution has an asymptotic behaviour corresponding to a global monopole. |
|||||||
Pdf file |
||||||||
|
Session |
AT7 |
Accepted |
|
Order |
Time |
|||
|
Talk |
Oral abstract |
Title |
The Gravity's Rainbow Cosmological Constant | |||||
| Coauthors | ||||||||
|
Abstract |
We compute the Zero Point Energy (ZPE) induced by quantum fluctuations around a fixed background with the help of a reformulation of the Wheeler-DeWitt equation. A variational approach is used for the calculation with Gaussian Trial Wave Functionals. The one loop contribution of the graviton to the ZPE is extracted keeping under control the UltraViolet divergences by means of a distorted gravitational field knows as Gravity's Rainbow. The finite ZPE is here interpreted as an induced Cosmological Constant. |
|||||||
Pdf file |
||||||||