3,986 research outputs found
Absorption Probability of De Sitter Horizon for Massless Fields with Spin
The evaluation of the absorption coefficients are important for particle
emission caused by Hawking radiation. In the case of cosmological particle
emission from the event horizon in De Sitter space, it is known that the scalar
wave functions are solved in terms of Legendre functions. For fields with
higher spin, the solution has been examined with low frequency approximation.
We shows that the radial equations of the fields with spin and
can be solved analytically in terms of the hypergeometric functions. We
calculate the absorption probability using asymptotic expansion for high
frequency limit. It turns out that the absorption coefficients are universal to
all bosonic fields; They depend only on the angular momentum and not spin. In
the case of spin fermions, we can also find non-vanishing absorption
probability in contrast to the previously known result.Comment: 7 pages, Late
Reconstruction of quark mass matrices in the NNI form from the experimental data
We examined the question that what is a general form of quark mass matrices
which is achieved by the transformation that leaves the left-handed gauge
interaction invariant. In particular, we analyzed in detail the Fritzsch-type
and the Branco-Silva-Marcos-type parametrization. Both parametrizations contain
ten parameters and can be expressed by the experimental data. We explicitly
reconstructed quark mass matrices in terms of quark masses and CKM parameters
for the Fritzsch-type parametrization.Comment: 17 pages and 4 figure
A New Solution of the Solar Neutrino Flux
We report a new solution to explain the observed deficit of the solar
neutrino flux by Homestake, Kamiokande II and III, GALLEX and SAGE experiments.
We use the matter mixing and the helicity oscillation in the twisting magnetic
fields in the sun. Our model predicts the short (seasonal) and long (11 years)
time variations of the solar neutrino flux. Three kinds of data observed by
Homestake, Kamiokande, GALLEX and SAGE detectors are reproduced well if the
mixing angle and the squared mass difference are in the small area around
and .Comment: 13 pages and 4 figures (not included), in phyzzx, OU-HET-19
Analytic Solutions of the Regge-Wheeler Equation and the Post-Minkowskian Expansion
Analytic solutions of the Regge-Wheeler equation are presented in the form of
series of hypergeometric functions and Coulomb wave functions which have
different regions of convergence. Relations between these solutions are
established. The series solutions are given as the Post-Minkowskian expansion
with respect to a parameter , being the mass of
black hole. This expansion corresponds to the post-Newtonian expansion when
they are applied to the gravitational radiation from a particle in circular
orbit around a black hole. These solutions can also be useful for numerical
computations.Comment: 22 page
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