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4 papers · 1 filter
An Exact Calculation of the Energy Density of Cosmological Gravitational Waves
L. E. Mendes, A. B. Henriques, R. G. Moorhouse
In this paper we calculate the Bogoliubov coefficients and the energy density of the stochastic gravitational wave background for a universe that undergoes inflation followed by ra…
Supersymmetric Contributions to $\BB$ and $\KK$ Mixings
G. C. Branco, G. C. Cho, Y. Kizukuri +1
We show that in the supersymmetric standard model (SSM) box diagrams mediated by charginos and up-type squarks may give large contributions to $\BB$ and $\KK$ mixings. This is due…
Two-Dimensional Black Holes and Planar General Relativity
Jose' P. S. Lemos
The Einstein-Hilbert action with a cosmological term is used to derive a new action in 1+1 spacetime dimensions. It is shown that the two-dimensional theory is equivalent to planar…
Cylindrical Black Hole in General Relativity
Jose' P. S. Lemos
A black hole solution of Einstein's field equations with cylindrical symmetry is found. Using the Hamiltonian formulation one is able to define mass and angular momentum for the cy…