Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-08-11
Phys.Rev.D68:123509,2003
Astronomy and Astrophysics
Astrophysics
9 pages, 8 figures, uses revtex, submitted PRD
Scientific paper
10.1103/PhysRevD.68.123509
A cosmological scenario is proposed where the dark matter (DM) and dark energy (DE) of the universe are two simultaneous manifestations of an inhomogenous dilaton. The equation of state of the field is scale-dependent and pressureless at galactic and larger scales and it has negative pressure as a DE at very large scales. The dilaton drives an inflationary phase followed by a kinetic energy-dominated one, as in the "quintessential inflation" model introduced by Peebles & Vilenkin, and soon after the end of inflation particle production seeds the first inhomogeneities that lead to galaxy formation. The dilaton is trapped near the minimum of the potential where it oscillates like a massive field, and the excess of kinetic energy is dissipated via the mechanism of "gravitational cooling" first introduced by Seidel & Suen. The inhomogeneities therefore behave like solitonic oscillations around the minimum of the potential, known as "oscillatons", that we propose account for most DM in galaxies. Those regions where the dilaton does not transform enough kinetic energy into reheating or carry an excess of it from regions that have cooled, evolve to the tail of the potential as DE, driving the acceleration of the universe.
No associations
LandOfFree
Dark energy and dark matter from an inhomogeneous dilaton does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Dark energy and dark matter from an inhomogeneous dilaton, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dark energy and dark matter from an inhomogeneous dilaton will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-695071