Forty years after the discovery of Hawking radiation, its exact nature remains elusive. If
Hawking radiation does not carry any information out from the ever shrinking black hole, it …

This paper outlines astrophysical issues related to the long-term fate of the universe. The
authors consider the evolution of planets, stars, stellar populations, galaxies, and the …

The Early Universe has become the standard reference on forefront topics in cosmology,
particularly to the early history of the Universe. Subjects covered include primordial …

Building on the work of Morris, Thorne, and Yurtsever, some particularly simple examples of
traversable wormholes are exhibited. These examples are notable both because the …

Recently, observational hints for supermassive black holes have been accumulating, which
has inspired ones to wonder: Can primordial black holes (PBHs) be supermassive, in …

A bstract The Standard Model Higgs potential becomes unstable at large field values. After
clarifying the issue of gauge dependence of the effective potential, we study the …

In this paper I present a new class of traversalle wormholes. This is done by surgically
grafting two Schwarzschild spacetimes together in such a way that no event horizon is to …

Primordial black holes (PBHs) are a viable candidate for dark matter if the PBH masses are
in the currently unconstrained “sublunar” mass range. We revisit the possibility that PBHs …

This paper shows how the structure and dynamics of a thin shell traveling at the speed of
light can be obtained from a simple and convenient prescription that is a straightforward …

Are we in imminent danger of extinction? Yes, we probably are, argues John Leslie in his
chilling account of the dangers facing the human race as we approach the second …