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32 papers · 1 filter
Destroying a near-extremal Kerr-Newman black hole
Alberto Saa, Raphael Santarelli
We revisit here a previous argument due to Wald showing the impossibility of turning an extremal Kerr-Newman black hole into a naked singularity by plunging test particles across t…
Kinetic Theory of Collisionless Self-Gravitating Gases: Post-Newtonian Polytropes
C. A. Agón, J. F. Pedraza, J. Ramos-Caro
In this paper we study the kinetic theory of many-particle astrophysical systems and we present a consistent version of the collisionless Boltzmann equation in the 1PN approximatio…
Vacuum Fluctuations and the Small Scale Structure of Spacetime
S. Carlip, R. A. Mosna, J. P. M. Pitelli
We show that vacuum fluctuations of the stress-energy tensor in two-dimensional dilaton gravity lead to a sharp focusing of light cones near the Planck scale, effectively breaking…
n-Dimensional FLRW Quantum Cosmology
P. S. Letelier, J. P. M. Pitelli
We introduce the formalism of quantum cosmology in a Friedmann-Lemaître-Robertson-Walker (FLRW) universe of arbitrary dimension filled with a perfect fluid with equation of…
Quantum Singularities in Static Spacetimes
J. P. M. Pitelli, P. S. Letelier
We review the mathematical framework necessary to understand the physical content of quantum singularities in static spacetimes. We present many examples of classical singular spac…
Quantum singularities in FRW universe revisited
Patricio S. Letelier, João Paulo M. Pitelli
The components of the Riemann tensor in the tetrad basis are quantized and, through the Einstein equation, we find the local expectation value in the ontological interpretation of…