Signatures of an Emergent Gravity from Black Hole Entropy (2009)
The existence of a thermodynamic description of horizons indicates that spacetime has a microstructure. While the "fundamental" degrees of freedom remain elusive, quantizing Einstein's gravity...
Bose Condensation and the BTZ Black Hole (2009)
Vaz, Cenalo, Wijewardhana, L. C. R.
Although all popular models of quantum gravity are able to recover the Bekenstein-Hawking entropy-area law in the thermodynamic limit, there are significant differences in the microstates and in the...
Spectrum and Statistical Entropy of AdS Black Holes (2009)
Vaz, Cenalo, Wijewardhana, L. C. R.
Popular approaches to quantum gravity describe black hole microstates differently and apply different statistics to count them. Since the relationship between the approaches is not clear, this...
Near extremal black branes in Einstein-Gauss-Bonnet gravity (2008)
Suranyi, P., Vaz, Cenalo, Wijewardhana, L. C. R.
The critical behavior at the lower bound of the mass range of black branes in Einstein-Gauss-Bonnet gravity is investigated. No black brane solutions exist below a critical mass, depending on the...
A Rotating, Inhomogeneous Dust Interior for the BTZ Black Hole (2008)
We present exact solutions describing rotating, inhomogeneous dust with generic initial data in 2+1 dimensional AdS spacetime and show how they are smoothly matched to the Banados-Teitelboim-Zanelli...
Vaz, Cenalo, Tibrewala, Rakesh, Singh, T. P.
In a previous paper we studied the collapse of a spherically symmetric dust distribution (marginally bound LTB) in d-dimensional AdS spacetime and obtained the condition for the formation of trapped...
A 6 dimensional $(Z_{2})^3$ symmetric model with warped physical space (2008)
Sahabandu, Chetiya, Suranyi, Peter, Vaz, Cenalo, Wijewardhana, L. C. Rohana
The Randall-Sundrum model is studied in 6 dimension with AdS$_4$ or dS$_4$ metric in the physical 4 dimensional space. Two solutions are found, one with induced 5-dimensional gravity terms added to...
Mass Spectrum and Statistical Entropy of the BTZ black hole from Canonical Quantum Gravity (2007)
Vaz, Cenalo, Gutti, Sashideep, Kiefer, Claus, Singh, T. P., Wijewardhana, L. C. R.
In a recent publication we developed a canonical quantization program describing the gravitational collapse of a spherical dust cloud in 2+1 dimensions with a negative cosmological constant...
Classical and Quantum Gravitational Collapse in d-dim AdS Spacetime I. Classical Solutions (2007)
Tibrewala, Rakesh, Gutti, Sashideep, Singh, T. P., Vaz, Cenalo
We study the collapse of a spherically symmetric dust distribution in $d$-dimensional AdS spacetime. We investigate the role of dimensionality, and the presence of a negative cosmological constant,...
Quantum Gravitational Collapse and Hawking Radiation in 2+1 Dimensions (2007)
Vaz, Cenalo, Gutti, Sashideep, Kiefer, Claus, Singh, T. P.
We develop the canonical theory of gravitational collapse in 2+1 dimensions with a negative cosmological constant and obtain exact solutions of the Wheeler--DeWitt equation regularized on a lattice....
Braneworlds and Dark Energy (2006)
In the Randall-Sundrum scenario, we analyse the dynamics of an AdS5 braneworld when conformal matter fields propagate in five dimensions. We show that conformal fields of weight -4 are associated...
Classical and quantum LTB model for the non-marginal case (2006)
Kiefer, Claus, Müller-Hill, Jakob, Vaz, Cenalo
We extend the classical and quantum treatment of the Lemaître-Tolman-Bondi (LTB) model to the nonmarginal case (defined by the fact that the shells of the dust cloud start with a nonvanishing...
Classical and quantum LTB model for the non-marginal case (2005)
Kiefer, Claus, Mueller-Hill, Jakob, Vaz, Cenalo
We extend the classical and quantum treatment of the Lemaitre-Tolman-Bondi (LTB) model to the non-marginal case (defined by the fact that the shells of the dust cloud start with a non-vanishing...
A Time-Like Naked Singularity (2004)
Goswami, Rituparno, Joshi, Pankaj S., Vaz, Cenalo, Witten, Louis
We construct a class of spherically symmetric collapse models in which a naked singularity may develop as the end state of collapse. The matter distribution considered has negative radial and...
The quantum gravitational black hole is neither black nor white (2004)
Understanding the end state of black hole evaporation, the microscopic origin of black hole entropy, the information loss paradox, and the nature of the singularity arising in gravitational collapse...
Quantizing Gravitational Collapse (2004)
I summarize some results obtained from a canonical quantization of gravitational collapse. The quantization is carried out in Kuchar variables on the LeMaitre-Tolman-Bondi family of spacetimes. I...
Conformal Bulk Fields, Dark Energy and Brane Dynamics (2003)
In the Randall-Sundrum scenario we analyze the dynamics of a spherically symmetric 3-brane when the bulk is filled with matter fields. Considering a global conformal transformation whose factor is...
Exact Quantum State of Collapse and Black Hole Radiation (2003)
Vaz, Cenalo, Witten, Louis, Singh, T. P.
We construct an exact quantum gravitational state describing the collapse of an inhomogeneous spherical dust cloud using a lattice regularization of the Wheeler-DeWitt equation. In the semiclassical...
Brane Dynamics, the Polytropic Gas and Conformal Bulk Fields (2003)
We consider in the Randall-Sundrum scenario the dynamics of a spherically symmetric 3-brane world when matter fields exist in the bulk. We determine exact 5-dimensional solutions which localize...
Inhomogeneous Dark Radiation Dynamics on a de Sitter Brane (2003)
Assuming spherical symmetry we analyse the dynamics of an inhomogeneous dark radiation vaccum on a Randall and Sundrum 3-brane world. Under certain natural conditions we show that the effective...
Brane World Dynamics and Conformal Bulk Fields (2003)
In the Randall-Sundrum scenario we investigate the dynamics of a spherically symmetric 3-brane world when matter fields are present in the bulk. To analyze the 5-dimensional Einstein equations we...
Gravitational collapse of an infinite dust cylinder (2002)
Gutti, Sashideep, Singh, T. P., Sundararajan, Pranesh, Vaz, Cenalo
We examine the gravitational collapse of an infinite cylindrical distribution of time like dust. In order to simplify the calculation we make an assumption that the axial and azimuthal metric...
Dark Radiation and Localization of Gravity on the Brane (2002)
We discuss the dynamics of a spherically symmetric dark radiation vaccum in the Randall-Sundrum brane world scenario. Under certain natural assumptions we show that the Einstein equations on the...
Quantum general relativity and Hawking radiation (2002)
Vaz, Cenalo, Kiefer, Claus, Singh, T. P., Witten, Louis
In a previous paper we have set up the Wheeler-DeWitt equation which describes the quantum general relativistic collapse of a spherical dust cloud. In the present paper we specialize this equation to...
Dark Radiation Dynamics on the Brane (2002)
We investigate the dynamics of a spherically symmetric vaccum on a Randall and Sundrum 3-brane world. Under certain natural conditions, the effective Einstein equations on the brane form a closed...
Toward a Quantization of Null Dust Collapse (2001)
Vaz, Cenalo, Witten, Louis, Singh, T. P.
Spherically symmetric, null dust clouds, like their time-like counterparts, may collapse classically into black holes or naked singularities depending on their initial conditions. We consider the...
Quantum Black Holes from Quantum Collapse (2001)
The Schwarzschild black hole can be viewed as the special case of the marginally bound Lema\^\i tre-Tolman-Bondi models of dust collapse which corresponds to a constant mass function. We have...
Toward a Midisuperspace Quantization of LeMaitre-Tolman-Bondi Collapse Models (2000)
Vaz, Cenalo, Witten, Louis, Singh, T. P.
LeMa\^\i tre-Tolman-Bondi models of spherical dust collapse have been used and continue to be used extensively to study various stellar collapse scenarios. It is by now well-known that these models...
Naked singularities and quantum gravity (2000)
Harada, Tomohiro, Iguchi, Hideo, Nakao, Ken-ichi, Singh, T. P., Tanaka, Takahiro, Vaz, Cenalo
There are known models of spherical gravitational collapse in which the collapse ends in a naked shell-focusing singularity for some initial data. If a massless scalar field is quantized on the...
The Quantum States and the Statistical Entropy of the Charged Black Hole (2000)
We quantize the Reissner-Nordstr\"om black hole using an adaptation of Kucha\v{r}'s canonical decomposition of the Kruskal extension of the Schwarzschild black hole. The Wheeler-DeWitt equation turns...
Radiation flux and spectrum in the Vaidya collapse model (2000)
We consider the quantization of a massless scalar field, using the geometric optics approximation, in the background spacetime of a collapsing spherical self-similar Vaidya star, which forms a black...
Divergence of the Quantum Stress Tensor on the Cauchy Horizon in 2-d Dust Collapse (2000)
Barve, Sukratu, Singh, T. P., Vaz, Cenalo
We prove that the quantum stress tensor for a massless scalar field in two dimensional non-selfsimilar Tolman Bondi dust collapse and Vaidya radiation collapse models diverges on the Cauchy horizon,...
Quantum Radiation from Black Holes and Naked Singularities in Spherical Dust Collapse (1999)
A sufficiently massive collapsing star will end its life as a spacetime singularity. The nature of the Hawking radiation emitted during collapse depends critically on whether the star's boundary...
Canonical Quantization and the Statistical Entropy of the Schwarzschild Black Hole (1999)
The canonical quantization of a Schwarzschild black hole yields a picture of the black hole that is shown to be equivalent to a collection of oscillators whose density of levels is commensurate with...
A simple derivation of the naked singularity in spherical dust collapse (1999)
Barve, Sukratu, Singh, T. P., Vaz, Cenalo, Witten, Louis
We describe a simple method of determining whether the singularity that forms in the spherically symmetric collapse of inhomogeneous dust is naked or covered. This derivation considerably simplifies...
Mass Quantization of the Schwarzschild Black Hole (1998)
We examine the Wheeler-DeWitt equaton for a static, eternal Schwarzschild black hole in Kucha\v r-Brown variables and obtain its energy eigenstates. Consistent solutions vanish in the exterior of the...
The Quantum Stress-Tensor in Self-Similar Spherical Dust Collapse (1998)
Barve, Sukratu, Singh, T. P., Vaz, Cenalo, Witten, Louis
We calculate the quantum stress tensor for a massless scalar field in the 2-d self-similar spherical dust collapse model which admits a naked singularity. We find that the outgoing radiation flux...
On the Spectrum of the Radiation from a Naked Singularitry (1998)
In the final stages of collapse, quantum radiation due to particle creation from a naked singularity is expected to be significantly different from black hole radiation. In certain models of collapse...
Particle Creation in the Marginally Bound, Self Similar Collapse of Inhomogeneous Dust (1998)
Barve, S., Singh, T. P., Vaz, Cenalo, Witten, Louis
We consider the evaporation of the (shell focusing) naked singularity formed during the self-similar collapse of a marginally bound inhomogeneous dust cloud, in the geometric optics approximation. We...
Quantum Naked Singularities in 2d Dilaton Gravity (1996)
Roughly speaking, naked singularities are singularities that may be seen by timelike observers. The Cosmic Censorship conjecture forbids their existence by stating that a reasonable system of energy...
Do Naked Singularities Form? (1995)
A naked singularity is formed by the collapse of a Sine-Gordon soliton in 1+1 dimensional dilaton gravity with a negative cosmological constant. We examine the quantum stress tensor resulting from...
Soliton Induced Singularities in 2 d Gravity and their Evaporation (1994)
Positive energy singularities induced by Sine-Gordon solitons in 1+1 dimensional dilaton gravity with positive and negative cosmological constant are considered. When the cosmological constant is...
Wilson Loops and Black Holes in 2+1 Dimensions (1994)
In 2+1 dimensional Chern-Simons gravity, Wilson loops in the three dimensional Anti de Sitter group, $SO(2,2)$, reproduce the spinning black hole of Ba\~nados, Teitelboim and Zanelli (BTZ) by...
Formation and Evaporation of a Naked Singularity in 2D Gravity (1993)
We describe a classical configuration of conformal matter forming a naked singularity and discuss its subsequent Hawking evaporation within the context of two dimensional dilaton gravity. The one...
Quantum gravity in more than four dimensions / (1987)
Thesis (Ph. D.)--Johns Hopkins University, 1988.