Over the past decade, f (R) theories have been extensively studied as one of the simplest
modifications to General Relativity. In this article we review various applications of f (R) …

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 …

Black hole solutions to Einstein's equations are examined in asymptotically flat N+ 1
dimensional space-times. First generalizations of Schwarzschild and Reissner-Nordstrøm …

Increasing evidence suggests that most of the energy density of the universe consists of a
dark energy component with negative pressure that causes the cosmic expansion to …

We provide a derivation of holographic entanglement entropy for spherical entangling
surfaces. Our construction relies on conformally map** the boundary CFT to a hyperbolic …

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 World in Eleven Dimensions: Supergravity, Supermembranes and M-theory Page 1
lteprinted from Phys. Lett. B 76 (1978) 409~12 Copyright 1978, with permission from Elsevier …

The past two decades have seen transformative advances in cosmology and string theory.
Observations of the cosmic microwave background have revealed strong evidence for …

We calculate the complete low-energy effective action to quartic order in the bosonic fields
for the heterotic string. We find that, in addition to the term involving Ξ (3) found previously …

A bstract We consider higher derivative corrections to the graviton three-point coupling
within a weakly coupled theory of gravity. Lorentz invariance allows further structures …