20-27 July 2011
Alpes Congrès - Alpexpo
Europe/Paris timezone

Gravitational Energy in Massive Gravity

22 Jul 2011, 16:30
15m
Berlioz (Alpes Congrès - Alpexpo)

Berlioz

Alpes Congrès - Alpexpo

Parallel session talk Cosmology and Gravity

Speaker

Dr Luigi Pilo (Department of Physics University of L'aquila)

Description

In GR the static gravitational potential of a self-gravitating body goes as 1/r at large distances and any slower decrease leads to infinity energy. We show that in a class of four-dimensional massive gravity theories there exists spherically symmetric solutions with finite total energy, featuring an asymptotic behavior slower than 1/r and generically of the form $r^\gamma$. This suggests that configurations with nonstandard asymptotics may well turn out to be physical. The effect is due to an extra field coupled only gravitationally, which allows for modifications of the static potential generated by matter, while counterbalancing the apparently infinite energy budget.

Primary authors

Dr Denis Comelli (INFN Ferrara) Dr Fabrizio Nesti (ICTP Trieste) Dr Luigi Pilo (Department of Physics University of L'aquila)

Presentation Materials