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Quasi normal modes in Schwarzschild-DeSitter spacetime: A simple derivation of the level spacing of the frequencies
T. Roy Choudhury, T. Padmanabhan
It is known that the imaginary parts of the quasi normal mode (QNM) frequencies for the Schwarzschild black hole are evenly spaced with a spacing that depends only on the surface g…
Cosmological parameters from supernova observations: A critical comparison of three data sets
T. Roy Choudhury, T. Padmanabhan
We extend our previous analysis of cosmological supernova data (Padmanabhan & Choudhury 2003) to include three recent compilation of data sets. Our analysis ignores systematic effe…
Quasi normal modes: A simple derivation of the level spacing of the frequencies
T. Padmanabhan
It is known that the imaginary parts of the frequencies of the quasi normal modes of the Schwarzschild black hole are equally spaced, with the level spacing dependent only on the s…
Role of Horizons in Semiclassical Gravity: Entropy and the Area Spectrum
T. Padmanabhan, Apoorva Patel
In any space-time, it is possible to have a family of observers who have access to only part of the space-time manifold, because of the existence of a horizon. We demand that \emph…
Gravitational clustering in Static and Expanding Backgrounds
T. Padmanabhan
A brief summary of several topics in the study of gravitational many body problem is given. The discussion covers both static backgrounds (applicable to astrophysical systems) as w…
Semiclassical quantization of gravity I: Entropy of horizons and the area spectrum
T. Padmanabhan, Apoorva Patel
The principle of equivalence provides a description of gravity in terms of the metric tensor and determines how gravity affects the light cone structure of the space-time. This, in…