It has, quite recently, become fashionable to study a certain class of holographic-inspired models for the dark energy. These investigations have, indeed, managed to make some significant advancesâ€¦ (More)

In this paper, we consider the quantum area spectrum for a rotating and charged (Kerr-Newman) black hole. Generalizing a recent study on Kerr black holes (which was inspired by the static-black holeâ€¦ (More)

We reconsider, from a novel perspective, how unitarity constrains the corrections to the ratio of shear viscosity Î· to entropy density s. We start with higher-derivative extensions of Einsteinâ€¦ (More)

We consider the one-loop quantum corrections to the thermodynamics of a black hole in generic 2-dimensional dilaton gravity. The classical action is the most general diffeomorphism invariant actionâ€¦ (More)

Suppose that there is a quantum operator that describes the horizon area of a black hole. Then what would be the form of the ensuing quantum spectrum? In this regard, it has been conjectured that theâ€¦ (More)

In view of our accelerating universe, one of the outstanding theoretical issues is the absence of a quantum-gravitational description of de Sitter space. Although speculative, an intriguingâ€¦ (More)

Recently, there has been much attention devoted to resolving the quantum corrections to the Bekensteinâ€“Hawking (black hole) entropy. In particular, many researchers have expressed a vested interestâ€¦ (More)

We calculate, using our recently proposed semiclassical framework, the quantum state of the Hawking pairs that are produced during the evaporation of a black hole (BH). Our framework adheres to theâ€¦ (More)

There has been substantial interest in obtaining a quantum-gravitational description of de Sitter space. However, any such attempts have encountered formidable obstacles, and new philosophicalâ€¦ (More)

Hawking radiation can usefully be viewed as a semi-classical tunneling process that originates at the black hole horizon. The same basic premise should apply to de Sitter background radiation, withâ€¦ (More)