We show that the semiclassical approximation to the Wheeler–DeWitt equation for the minisuperspace of a minimally coupled scalar field in the spatially flat deSitter universe prompts the existence of an initial power-law evolution driven by non-adiabatic terms from the gravitational wavefunction which act like radiation. This simple model hence describes the onset of inflation from a previous radiation-like expansion during which the cosmological constant is already present but subleading.
A radiation-like era before inflation / Corrado Appignani; Roberto Casadio. - In: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS. - ISSN 1475-7516. - ELETTRONICO. - 10:(2008), pp. 027-027. [10.1088/1475-7516/2008/10/027]
A radiation-like era before inflation
CASADIO, ROBERTO
2008
Abstract
We show that the semiclassical approximation to the Wheeler–DeWitt equation for the minisuperspace of a minimally coupled scalar field in the spatially flat deSitter universe prompts the existence of an initial power-law evolution driven by non-adiabatic terms from the gravitational wavefunction which act like radiation. This simple model hence describes the onset of inflation from a previous radiation-like expansion during which the cosmological constant is already present but subleading.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
