We review in detail a number of approaches that have been adopted to try and explain the
remarkable observation of our accelerating universe. In particular we discuss the arguments …

A groundbreaking text and reference book on twenty-first-century classical physics and its
applications This first-year graduate-level text and reference book covers the fundamental …

The requirement that physical phenomena associated with gravitational collapse should be
duly reconciled with the postulates of quantum mechanics implies that at a Planckian scale …

It has been suggested that an advanced civilization might have the technology to warp
spacetime so that closed timelike curves would appear, allowing travel into the past. This …

The asymmetry of nature under a'reversal of time'(that is, a reversal of motion and change)
appears only too obvious to us, as it deeply affects our own form of existence. If physics is to …

In this paper, using the recent method proposed by Ono, Ishihara and Asada (OIA) who
extend the idea of Gibbons and Werner to the stationary and axisymmetric case, we apply …

This book is about black holes, one of the most intriguing objects of modern theoretical
physics and astrophysics. For many years, black holes have been considered as interesting …

Ultracompact objects (UCOs) are horizonless compact objects that present light rings (LRs):
circular photon orbits. As a result, they could be black hole mimickers. Some years ago …

First, the ideas introduced in the wormhole research field since the work of Morris and
Thorne are reviewed, namely, the issues of energy conditions, wormhole construction …

Once quantum mechanical effects are included, the hypotheses underlying the positive
mass theorem of classical general relativity fail. As an example of the peculiarities attendant …