A slow-rolling scalar field (Q≡ quintessence) with potential energy VQ∼(3× 10− 3 eV) 4 has
been proposed as the origin of an accelerating universe at present. We investigate the …

We obtain the general inflationary solutions for the slab of five-dimensional AdS spacetime
where the fifth dimension is an orbifold S 1/Z 2 and two 3-branes reside at its boundaries, of …

We develop a framework to study the phase space of a system consisting of a scalar field
rolling down an arbitrary potential with a varying slope and a background fluid, in a …

Inflationary solutions are constructed in a specific five-dimensional model with boundaries
motivated by heterotic M theory. We concentrate on the case where the vacuum energy is …

We show that exponentially large warp factor hierarchies can be dynamically generated in
supersymmetric compactifications. The compactification we consider is the supersymmetric …

We discuss whether quark, charged lepton and neutrino masses and mixing angles may be
related by an extended flavour and family symmetry group. We show that current …

We present a method for explicitly computing the non-perturbative superpotentials
associated with the vector bundle moduli in heterotic superstrings and M-theory. This …

Based on the Z 12-I orbifold compactification of heterotic string theory, we construct a flipped-
SU (5) model with three families of standard model matter and ingredients for dynamical …

The question of how to stabilize all of the modulus fields coming from compactifications of
string theory on internal manifolds is one of the outstanding challenges for string cosmology …

We study the effective low energy supergravity of the strongly coupled heterotic string
compactified on a Calabi–Yau 3-fold with generic E8× E8 gauge bundle. We focus on the …