This paper is devoted to recent progress made towards the understanding of closed bosonic
and fermionic string perturbation theory, formulated in a Lorentz-covariant way on Euclidean …

The antibracket formalism for gauge theories, at both the classical and quantum level, is
reviewed. Gauge transformations and the associated gauge structure are analyzed in detail …

Spontaneous breaking of Lorentz symmetry in string theory Page 1 PHYSICAL REVIEW D
VOLUME 39,NUMBER 2 15 JANUARY 1989 Spontaneous breaking of Lorentz symmetry in …

We define the string space-time symmetries C, P, T and their products. The effects of
nonlocal interactions and the infinite number of particle fields are incorporated using string …

Scalar quintessence seems epicyclic because one can choose the potential to reproduce
any cosmology (I review the construction) and because the properties of this scalar seem to …

We consider the effects on cosmology of higher derivative modifications of gravity that make
it asymptotically free without introducing ghosts. The weakening of gravity at short distances …

The theory of superselection sectors is generalized to situations in which normal statistics
has to be replaced by braid group statistics. The essential role of the positive Markov trace of …

It has been conjectured that at a stationary point of the tachyon potential for the D-brane of
bosonic string theory, the negative energy density exactly cancels the D-brane tension. We …

We discuss the problems associated with the essential nonlocality of all string field actions.
Manifestly Poincaré invariant theories are shown to be unstable and bereft of an initial value …

We review the particle theory origin of inflation and curvaton mechanisms for generating
large scale structures and the observed temperature anisotropy in the cosmic microwave …