Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
1998-10-29
Gen.Rel.Grav.32:943-958,2000
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
14 pages LATEX, no figures
Scientific paper
10.1023/A:1001993226227
We consider cosmology in the framework of a `material reference system' of D particles, including the effects of quantum recoil induced by closed-string probe particles. We find a time-dependent contribution to the cosmological vacuum energy, which relaxes to zero as $\sim 1/ t^2$ for large times $t$. If this energy density is dominant, the Universe expands with a scale factor $R(t) \sim t^2$. We show that this possibility is compatible with recent observational constraints from high-redshift supernovae, and may also respect other phenomenological bounds on time variation in the vacuum energy imposed by early cosmology.
Ellis John
Mavromatos Nick E.
Nanopoulos Dimitri V.
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