Review articles tend to fall into two categories: either they are unbiased and comprehensive
with a list of references including every paper on the subject; or else they are selective …

We review higher-dimensional unified theories from the general relativity, rather than the
particle physics side. Three distinct approaches to the subject are identified and contrasted …

String theory is one of the most exciting and challenging areas of modern theoretical
physics. This book guides the reader from the basics of string theory to recent developments …

The effective action for type II string theory compactified on a six-torus is N= 8 supergravity,
which is known to have an E7 duality symmetry. We show that this is broken by quantum …

We consider scale invariant theories which couple gravity to Maxwell fields and
antisymmetric tensor fields with a dilaton field. We exhibit in a unified way solutions …

Nature's simplest field, the scalar field, has been the protagonist of physical theories for a
long time. Even before the publication of the theory of general relativity G. Nordström …

In the course of the development of electromagnetic, weak and strong interactions, the
concept of (internal) gauge invariance grew up and established itself as an unavoidable …

A conformal transformation is used to prove that a general theory with the action S= F d D
x√-g [F (φ, R)-(ε/2)(∇ φ) 2], where F (φ, R) is an arbitrary function of a scalar φ and a scalar …

In recent years, the use of conformal transformation techniques has become widespread in
the literature on gravitational theories alternative to general relativity, on cosmology, and on …

How is it possible to justify a lengthy review of the physics of the magnetic monopole when
nobody has ever seen one? fin spite of the unfortunate lack of favorable experimental …