String Dilaton Fluid Cosmology
S. Capozziello, G. Lambiase, R. Capaldo

TL;DR
This paper explores higher-dimensional string-dilaton cosmology with matter, deriving exact solutions and analyzing transitions to Einstein gravity and string coupling behaviors.
Contribution
It provides exact solutions for string-dilaton cosmology with matter, highlighting the transition from string-dominated to Einstein gravity regimes.
Findings
Exact solutions parametrized by matter and curvature
Recovery of Einstein gravity from string regime
Asymptotic freedom due to string coupling
Abstract
We investigate -dimensional string-dilaton cosmology with effective dilaton potential in presence of perfect-fluid matter.We get exact solutions parametrized by the constant of the state equation , the spatial dimension number , the bulk of matter, and the spatial curvature constant . Several interesting cosmological behaviours are selected. Finally we discuss the recovering of ordinary Einstein gravity starting from string dominated regime and a sort of asymptotic freedom due to string effective coupling.
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