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Accelerating Cosmological Models for an Interacting Tachyon
U. Filobello, A. de la Macorra
We study the cosmological evolution of a tachyon scalar field T with a Dirac- Born- Infeld type lagrangian and potential V (T) coupled to a canonically normalized scalar field with…
Quintessence Unification Models from Non-Abelian Gauge Dynamics
A. de la Macorra
We show that the condensates of a non-abelian gauge group, unified with the standard model gauge groups, can parameterize the present day cosmological constant and play the role of…
Can Moduli Fields parametrize the Cosmological Constant?
A. de la Macorra
We study the cosmological evolution of string/M moduli fields T. We use T-duality to fix the potential and show that the superpotential W is a function of the duality invariant fun…
General Scalar Fields as Quintessence
A. de la Macorra, G. Piccinelli
We study the cosmological evolution of scalar fields with arbitrary potentials in the presence of a barotropic fluid (matter or radiation) without making any assumption on which te…
Inflation in S-Dual Superstring Models
A. de la Macorra, S. Lola
We study inflationary potentials in the framework of superstring theories. Successful inflation may occur due to chiral fields, but only after the dilaton and moduli are stabilized…
Phenomenology of Superstrings
Axel de la Macorra
We consider the low energy phenomenology of superstrings. In particular we analyse supersymmetry breaking via gaugino condensate and we compare the phenomenology of the two differe…