8 papers
Scalar fluctuations in dilatonic brane-worlds
V. Bozza, M. Gasperini, G. Veneziano
We derive and solve the full set of scalar perturbation equations for a class of five-dimensional brane--world solutions, with a dilaton scalar field coupled to the bulk cosmologic…
Entropy Bounds and String Cosmology
G. Veneziano
After discussing some old (and not-so-old) entropy bounds both for isolated systems and in cosmology, I will argue in favour of a "Hubble entropy bound" holding in the latter conte…
Inflating, Warming Up, and Probing the Pre-Bangian Universe
G. Veneziano
Classical and quantum gravitational instabilities, can, respectively, inflate and warm up a primordial Universe satisfying a superstring-motivated principle of "Asymptotic Past Tri…
A Simple/Short Introduction to Pre-Big-Bang Physics/Cosmology
G. Veneziano
A simple, non-technical introduction to the pre-big bang scenario is given, emphasizing physical motivations, considerations, and consequences over formalism.
String cosmology and relic gravitational radiaton
G. Veneziano
String theory counterparts to Einstein's gravity, cosmology and inflation are described. A very tight upper bound on the Cosmic Gravitational Radiation Background (CGRB) of standar…
String Cosmology: Concepts and Consequences
G. Veneziano
After recalling a few basic concepts from cosmology and string theory, I will discuss the main ideas/assumptions underlying string cosmology and show how these lead to a two-parame…