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- Philadelphia UniversityUS4 papers
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10 papers · 1 filter
Time delay and magnification centroid due to gravitational lensing by black holes and naked singularities
K. S. Virbhadra, C. R. Keeton
We model the massive dark object at the center of the Galaxy as a Schwarzschild black hole as well as Janis-Newman-Winicour naked singularities, characterized by the mass and scala…
Lifting D-Instanton Zero Modes by Recombination and Background Fluxes
Ralph Blumenhagen, Mirjam Cvetic, Robert Richter +1
We study the conditions under which D-brane instantons in Type II orientifold compactifications generate a non-perturbative superpotential. If the instanton is non-invariant under…
On the Initial Conditions in New Ekpyrotic Cosmology
Evgeny I. Buchbinder, Justin Khoury, Burt A. Ovrut
New Ekpyrotic Cosmology is an alternative scenario of early universe cosmology in which the universe existed before the big bang. The simplest model relies on two scalar fields, wh…
Energy Distribution of a Charged Black Hole with a Minimally Coupled Scalar Field
Paul Halpern
Using three different energy-momentum complexes, the Einstein, Landau-Lifshitz, and Papapetrou prescriptions, we calculate the energy of an electrically charged black hole exact so…
Torsion theories for finite von Neumann algebras
Lia Vas
The study of modules over a finite von Neumann algebra can be advanced by the use of torsion theories. In this work, some torsion theories for are pre…
A simplification of Morita's construction of total right rings of quotients for a class of rings
Lia Vas
The total right ring of quotients sometimes also called the maximal flat epimorphic right ring of quotients or right flat epimorphic hull, is usually obtai…