4,380 research outputs found
Thermonuclear burn-up in deuterated methane
The thermonuclear burn-up of highly compressed deuterated methane CD is
considered in the spherical geometry. The minimal required values of the
burn-up parameter are determined for various
temperatures and densities . It is shown that thermonuclear burn-up
in becomes possible in practice if its initial density exceeds
. Burn-up in CDT methane
requires significantly ( 100 times) lower compressions. The developed
approach can be used in order to compute the critical burn-up parameters in an
arbitrary deuterium containing fuel
Traversable Wormholes and Black Hole Complementarity
Black hole complementarity is incompatible with the existence of traversable
wormholes. In fact, traversable wormholes cause problems for any theory where
information comes out in the Hawking radiation.Comment: 4 pages, CALT-68-193
Quantization of the black hole area as quantization of the angular momentum component
In transforming from Schwarzschild to Euclidean Rindler coordinates the
Schwarzschild time transforms to a periodic angle. As is well-known, this
allows one to introduce the Hawking temperature and is an origin of black hole
thermodynamics. On the other hand, according to quantum mechanics this angle is
conjugate to the component of the angular momentum. From the commutation
relation and quantization condition for the angular momentum component it is
found that the area of the horizon of a Schwarzschild black hole is quantized
with the quantum . It is shown that this conclusion is
also valid for a generic Kerr-Newman black hole.Comment: 4 pages (revtex), no figures; a boundary condition for the
differential equation (15) added; the absent of the remnants in the approach
noted; a reference added; accepted by Physical Review D for publicatio
On the bound state of the antiproton-deuterium-tritium ion
The properties of the weakly-bound state in the ion
are investigated with the use of the results of highly accurate computations.
The hyperfine structure splitting of this ion is investigated. We also evaluate
the life-time of the ion against the nuclear fusion and
discuss a possibility to evaluate the corresponding annihilation rate(s)
Accretion of non-minimally coupled generalized Chaplygin gas into black holes
The mass evolution of Schwarzschild black holes by the absorption of scalar
fields is investigated in the scenario of the generalized Chaplygin gas (GCG).
The GCG works as a unification picture of dark matter plus dark energy that
naturally accelerates the expansion of the Universe. Through elements of the
quasi-stationary approach, we consider the mass evolution of Schwarzschild
black holes accreted by non-minimally coupled cosmological scalar fields
reproducing the dynamics of the GCG. As a scalar field non-minimally coupled to
the metrics, such an exotic content has been interconnected with accreting
black holes. The black hole increasing masses by the absorption of the gas
reflects some consistence of the accretion mechanism with the hypothesis of the
primordial origin of supermassive black holes. Our results effectively show
that the non-minimal coupling with the GCG dark sector accelerates the
increasing of black hole masses. Meanwhile some exotic features can also be
depicted for specific ranges of the non-minimal coupling in which the GCG
dynamics is substantially modified.Comment: 13 pages, 03 figure
Soap Bubbles in Outer Space: Interaction of a Domain Wall with a Black Hole
We discuss the generalized Plateau problem in the 3+1 dimensional
Schwarzschild background. This represents the physical situation, which could
for instance have appeared in the early universe, where a cosmic membrane (thin
domain wall) is located near a black hole. Considering stationary axially
symmetric membranes, three different membrane-topologies are possible depending
on the boundary conditions at infinity: 2+1 Minkowski topology, 2+1 wormhole
topology and 2+1 black hole topology.
Interestingly, we find that the different membrane-topologies are connected
via phase transitions of the form first discussed by Choptuik in investigations
of scalar field collapse. More precisely, we find a first order phase
transition (finite mass gap) between wormhole topology and black hole topology;
the intermediate membrane being an unstable wormhole collapsing to a black
hole. Moreover, we find a second order phase transition (no mass gap) between
Minkowski topology and black hole topology; the intermediate membrane being a
naked singularity.
For the membranes of black hole topology, we find a mass scaling relation
analogous to that originally found by Choptuik. However, in our case the
parameter is replaced by a 2-vector parametrizing the solutions.
We find that where . We also find a periodic wiggle in the scaling relation.
Our results show that black hole formation as a critical phenomenon is far
more general than expected.Comment: 15 pages, Latex, 4 figures include
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