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6 papers · 2 filters
Static spherically symmetric scalar field spacetimes with C^0 matching
Swastik Bhattacharya, Pankaj S. Joshi
All the classes of static massless scalar field models available currently in the Einstein theory of gravity necessarily contain a strong curvature naked singularity. We obtain her…
Accelerated cosmic expansion in a scalar-field universe
Swastik Bhattacharya, Pankaj S. Joshi, Ken-ichi Nakao
We consider here a spherically symmetric but inhomogeneous universe filled with a massless scalar field. The model obeys two constraints. The first one is that the gradient of the…
Black Holes in Active Galactic Nuclei
M. J. Valtonen, S. Mikkola, D. Merritt +7
Supermassive black holes are common in centers of galaxies. Among the active galaxies, quasars are the most extreme, and their black hole masses range as high as to $6\cdot 10^{10}…
Radiation from collapsing shells, semiclassical backreaction and black hole formation
Aseem Paranjape, T. Padmanabhan
We provide a detailed analysis of quantum field theory around a collapsing shell and discuss several conceptual issues related to the emission of radiation flux and formation of bl…
Non-marginal LTB-like models with inverse triad corrections from loop quantum gravity
Martin Bojowald, Juan D. Reyes, Rakesh Tibrewala
Marginal LTB models with corrections from loop quantum gravity have recently been studied with an emphasis on potential singularity resolution. This paper corroborates and extends…
Quantum theory, noncommutative gravity, and the cosmological constant problem
T. P. Singh
The cosmological constant problem is principally concerned with trying to understand how the zero-point energy of quantum fields contributes to gravity. Here we take the approach t…