共查询到20条相似文献,搜索用时 15 毫秒
1.
The (2+1)-dimensional Maxwell-Chern-Simons gravity with phantom dilaton field coupling is studied in this paper.It is shown that black hole solution to exist when electromagnetic coupled to dilaton field in the non-trivial way.Moreover,asymptotic index and distribution parameter of current density are calculated by using black hole solution,some new features of this solution are briefly discussed. 相似文献
2.
We construct a new analytic solution of Einstein–Born–Infeld-dilaton theory in the presence of Liouville-type potentials for the dilaton field. These solutions describe dilaton black holes with nontrivial topology and nonlinear electrodynamics. Black hole horizons and cosmological horizons in these spacetimes, can be a two-dimensional positive, zero or negative constant curvature surface. The asymptotic behavior of these solutions are neither flat nor (A)dS. We calculate the conserved and thermodynamic quantities of these solutions and verify that these quantities satisfy the first law of black hole thermodynamics. 相似文献
3.
We show in detail that the Hawking temperature calculated from the surface gravity is in agreement with the result of exact semi-classical radiation spectrum for higher dimensional linear dilaton black holes in various theories. We extend the method derived first by Clément–Fabris–Marques for 4-dimensional linear dilaton black hole solutions to the higher dimensions in theories such as Einstein–Maxwell dilaton, Einstein–Yang–Mills dilaton and Einstein–Yang–Mills–Born–Infeld dilaton. Similar to the Clément–Fabris–Marques results, it is proved that whenever an analytic solution is available to the massless scalar wave equation in the background of higher dimensional massive linear dilaton black holes, an exact computation of the radiation spectrum leads to the Hawking temperature TH in the high frequency regime. The significance of the dimensionality on the value of TH is shown, explicitly. For a chosen dimension, we demonstrate how higher dimensional linear dilaton black holes interpolate between the black hole solutions with Yang–Mills and electromagnetic fields by altering the Born–Infeld parameter in aspect of measurable quantity TH. Finally, we explain the reason of, why massless higher dimensional linear dilaton black holes cannot radiate. 相似文献
4.
《Physics letters. [Part B]》1999,461(3):189-195
A recent study shows that Hawking radiation of a massless scalar field does not appear on the two-dimensional AdS2 black hole background. We shall study this issue by calculating absorption and reflection coefficients under dilaton coupling with the matter field. If the scalar field does not couple to the dilaton, then it is fully absorbed into the black hole without any outgoing mode. On the other hand, once it couples to the dilaton field, the outgoing mode of the massless scalar field exists, and the nontrivial Hawking radiation appears. Finally, we comment on this dilaton dependence of Hawking radiation in connection with a three-dimensional black hole. 相似文献
5.
Burkhard Kleihaus Jutta Kunz Francisco Navarro-Lérida Ulrike Neemann 《General Relativity and Gravitation》2008,40(6):1279-1310
We consider globally regular and black hole solutions in SU(2) Einstein–Yang–Mills–Higgs theory, coupled to a dilaton field.
The basic solutions represent magnetic monopoles, monopole–antimonopole systems or black holes with monopole or dipole hair.
When the globally regular solutions carry additionally electric charge, an angular momentum density results, except in the
simplest spherically symmetric case. We evaluate the global charges of the solutions and their effective action, and analyze
their dependence on the gravitational coupling strength. We show, that in the presence of a dilaton field, the black hole
solutions satisfy a generalized Smarr type mass formula.
B. Kleihaus gratefully acknowledges support by the German Aerospace Center.
F. Navarro-Lérida gratefully acknowledges support by the Ministerio de Educación y Ciencia under grant EX2005-0078. 相似文献
6.
We investigate extremal charged black hole solutions in the four-dimensional string frame Gauss-Bonnet gravity with the Maxwell
field and the dilaton. Without curvature corrections, the extremal electrically charged dilatonic black holes have singular
horizon and zero Bekenstein entropy. When the Gauss-Bonnet term is switched on, the horizon radius expands to a finite value
provided curvature corrections are strong enough. Below a certain threshold value of the Gauss-Bonnet coupling the extremal
black hole solutions cease to exist. Since decreasing Gauss-Bonnet coupling corresponds to decreasing string coupling g
s
, the situation can tentatively be interpreted as classical indication on the black hole—string transition. Previously the
extremal dilaton black holes were studied in the Einstein-frame version of the Gauss-Bonnet gravity. Here we work in the string
frame version of the theory with the S-duality symmetric dilaton function as required by the heterotic string theory.
The article is published in the original. 相似文献
7.
In this paper, we apply the quantum anomaly cancelation method and the effective action approach as well as the method of Damour–Ruffini–Sannan to derive Hawking radiation of Dirac particles from the Myers–Perry black hole. Using the dimensional reduction technique, we find that the fermionic field in the background of the Myers–Perry black hole can be treated as an infinite collection of quantum fields in (1+1)-dimensional background coupled with the dilaton field and the U(1) gauge field near the horizon. Thus Hawking temperature and fluxes are found. The Hawking temperature obtained agrees with the surface gravity formula while the Hawking fluxes derived from the anomaly cancelation method and the effective action approach are in complete agreement with the ones obtained from integrating the Planck distribution. 相似文献
8.
《Nuclear Physics B》2001,609(3):429-441
We describe in superspace a classical theory of of two-dimensional (1,1) dilaton supergravity coupled to a super-Liouville field, and find exact super black hole solutions to the field equations that have non-constant curvature. We consider the possibility that a gravitini condensate forms and look at the implications for the resultant spacetime structure. We find that all such condensate solutions have a condensate and/or naked curvature singularity. 相似文献
9.
以Gibbons-Maeda dilaton黑洞和Garfinkle-Horowitz-Strominger dilaton黑洞为例,研究空间的非对易性对黑洞热力学性质的影响.通过对比对易时空中Gibbons-Maeda dilaton黑洞和非对易时空中Garfinkle-Horowitz-Strominger dilaton黑洞的温度,得出如下结论:从对黑洞热力学性质产生影响这一角度来说,时空的非对易性和黑洞的荷(电荷或磁荷)有相似的作用. 相似文献
10.
S. H. Hendi A. Sheykhi M. H. Dehghani 《The European Physical Journal C - Particles and Fields》2010,70(3):703-712
In this paper, we study topological AdS black branes of (n+1)-dimensional Einstein–Maxwell-dilaton theory and investigate their properties. We use the area law, surface gravity and
Gauss law interpretations to find entropy, temperature and electrical charge, respectively. We also employ the modified Brown
and York subtraction method to calculate the quasilocal mass of the solutions. We obtain a Smarr-type formula for the mass
as a function of the entropy and the charge, compute the temperature and the electric potential through the Smarr-type formula
and show that these thermodynamic quantities coincide with their values which are calculated through using the geometry. Finally,
we perform a stability analysis in the canonical ensemble and investigate the effects of the dilaton field and the size of
black brane on the thermal stability of the solutions. We find that large black branes are stable but for small black brane,
depending on the value of dilaton field and type of horizon, we encounter with some unstable phases. 相似文献
11.
In this paper, we present the metric for the n-dimensional charged slowly rotating dilaton black hole with N = [(n −1)/2] independent rotation parameters, associated with N orthogonal planes of rotation in the background of asymptotically flat and asymptotically (anti)-de Sitter spacetime. The
mass, angular momentum and the gyromagnetic ratio of such a black hole are determined for the arbitrary values of the dilaton
coupling constant. We find that the gyromagnetic ratio crucially depends on the dilaton coupling constant, α, and decreases with increasing α in any dimension. 相似文献
12.
《Nuclear Physics B》1995,436(3):721-745
Some years ago Dray and 't Hooft found the necessary and sufficient conditions to introduce a gravitational shock wave in a particular class of vacuum solutions to Einstein's equations. We extend this work to cover cases where non-vanishing matter fields and a cosmological constant are present. The sources of gravitational waves are massless particles moving along a null surface such as a horizon in the case of black holes. After we discuss the general case we give many explicit examples. Among them are the d-dimensional charged black hole (that includes the 4-dimensional Reissner-Nordström and the d-dimensional Schwarzschild solution as subcases), the 4-dimensional De Sitter and anti-De Sitter spaces (and the Schwarzschild-De Sitter black hole), the 3-dimensional anti-De Sitter black hole, as well as backgrounds with a covariantly constant null Killing vector. We also address the analogous problem for string-inspired gravitational solutions nd give a few examples. 相似文献
13.
Motivated by many worthwhile papers about (2+1)-dimensional BTZ black hole solutions, we generalize them to (n+1)-dimensional solutions, the so-called BTZ-like solutions. We show that the electric field of BTZ-like solutions is the
same as that of (2+1)-dimensional BTZ black holes, and also their lapse functions are approximately the same, too. By these
similarities, it is also interesting to investigate the geometric and thermodynamics properties of the BTZ-like solutions.
We find that, depending on the metric parameters, the BTZ-like solutions may be interpreted as black hole solutions with inner
(Cauchy) and outer (event) horizons, an extreme black hole or naked singularity. Then, we obtain the conserved and thermodynamic
quantities, and we show that they satisfy the first law of thermodynamics. Next, we perform a thermodynamic stability analysis
in the canonical ensemble and find that the BTZ-like solutions are stable in the whole phase space. 相似文献
14.
We show in detail that the entropic force of the static spherically symmetric spacetimes with unusual asymptotics can be calculated
through the Verlinde’s arguments. We introduce three different holographic screen candidates, which are first employed thoroughly
by Myung and Kim [Phys. Rev. D 81, 105012 (2010)] for Schwarzschild black hole solutions, in order to identify the entropic force arising between a charged dilaton black
hole and a test particle. The significance of the dilaton parameter on the entropic force is highlighted, and shown graphically. 相似文献
15.
The AdS
5 black hole space-time with perturbed dilaton field background considered. We use the holographic AdS/QCD soft-wall model
to investigate the wave functions and the effective potential. In this model, glueballs are described by a massless scalar
field in an AdS
5 black hole with a dilaton soft-wall background. For the first time we use modified dilaton field and discuss the consequence
of the perturbation. In order to obtain the effective potential we rewrite the equation of motion in the Schr?dinger like
equation, then try to find corresponding solution. 相似文献
16.
We discuss the possible modification of Einstein's theory of gravitation due to the fifth force generated by the Kaluza-Klein dilaton. In particular we discuss the gravitational redshift, the deflection of light, the precession of perihelia, and the time-delay of radar echo around a spherically symmetric black hole in a 7-dimensional Kaluza-Klein unification which hasE
2 as the internal isometry. It is shown that the long-range effect of the higher-dimensional fifth force is characterized by the dilatonic charge carried by the black hole even when it is neutral. 相似文献
17.
We present the metric for the (n + 1)-dimensional charged rotating dilaton black branes with cylindrical or toroidal horizons in the background of anti-de
Sitter spacetime. We find the suitable counterterm which removes the divergences of the action in the presence of the dilaton
potential in all higher dimensions. We plot the Penrose diagrams of the spacetime and reveal that the spacetime geometry crucially
modifies in the presence of the dilaton field. The conserved and thermodynamic quantities of the black branes are also computed. 相似文献
18.
We consider the metric exterior to a charged dilaton black hole in a de Sitter universe. We study the motion of a test particle
in this metric. Conserved quantities are identified and the Hamilton–Jacobi method is employed for the solutions of the equations
of motion. At large distances from the black hole the Hubble expansion of the universe modifies the effective potential such
that bound orbits could exist up to an upper limit of the angular momentum per mass for the orbiting test particle. We then
study the phenomenon of strong field gravitational lensing by these black holes by extending the standard formalism of strong
lensing to the non-asymptotically flat dilaton-de Sitter metric. Expressions for the various lensing quantities are obtained
in terms of the metric coefficients. 相似文献
19.
In the asymptotically flat two-dimensional dilaton gravity, we present an N-body particle action which has a dilaton coupled mass term for the exact solubility. This gives nonperturbative exact solutions for the N-body self-gravitating system, so the infalling particles form a black hole and their trajectories are exactly described. In our two-dimensional case, the critical mass for the formation of black holes does not exist, so even a single particle forms a black hole. The infalling particles give additional time-like singularities in addition to the space-like black hole singularity. However, the latter singularities can be properly cloaked by the future horizons within some conditions. 相似文献
20.
In the asymptotically flat two-dimensional dilaton gravity, we present an N-body particle action which has a dilaton coupled mass term for the exact solubility. This gives nonperturbative exact solutions for the N-body self-gravitating system, so the infalling particles form a black hole and their trajectories are exactly described. In our two-dimensional case, the critical mass for the formation of black holes does not exist, so even a single particle forms a black hole. The infalling particles give additional time-like singularities in addition to the space-like black hole singularity. However, the latter singularities can be properly cloaked by the future horizons within some conditions. 相似文献