Cosmological energy in a thermo-horizon and the first law

Cécile Barbachoux (1) , Jérome Gariel (1) , Gérard Le Denmat (1)

1 LERMA - Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique

We consider a cosmological horizon, named thermo-horizon, to which are associated a temperature and an entropy of Bekenstein-Hawking and which obeys the first law for an energy flow calculated through the corresponding limit surface. We point out a contradiction between the first law and the definition of the total energy contained inside the horizon. This contradiction is removed when the first law is replaced by a Gibbs' equation for a vacuum-like component associated to the event horizon.

Mots clés: thermo-horizon; first law; dark energy

Domaines: Physique des Hautes Energies - Théorie [hep-th]; Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Relativité Générale et Cosmologie Quantique [gr-qc]

Cécile Barbachoux, Jérome Gariel, Gérard Le Denmat. Cosmological energy in a thermo-horizon and the first law. 2007. ⟨hal-00144535⟩