Black holes are described by solutions of the Einstein vacuum (or electrovac) equation and these solutions are unique. We wish to consider the question: can we get the same solutions from a slightly different and more general equation, which is not the derivative of the original equation? The...
Black hole solutions and Euler equation in Rastall and generalized Rastall theories of gravityModified gravityblack holethermodynamicsFocusing on the special case of generalized Rastall theory, as a subclass of the non-minimal curvature-matter coupling theories in which the field equations are ...
Stimulated by the recent researches of black hole thermodynamics for black hole with Newman–Unti–Tamburino (NUT) parameter, we investigate the
where M represents the mass of the black hole. Solving the KG equation or Dirac equation near the event horizon of the black hole, one can obtain a set of positive frequency modes propagating in the exterior and interior regions of the event horizon. Here, we introduce the quantization of ...
This would simplify not only the construction of the optical black hole but also the calculation of light propagation, since the wavelength and width of the light source would be much smaller than the system size and related gradient length scales. The minimum gradient scale length of the scalar...
Black Hole Spacetime Equation in Special RelativityMaziar KhoshsimaM. Khoshsima, "Black Hole Spacetime Equation in Special Relativity." International Journal of Astronomy, Astrophysics and Space Science; Vol. 2, No. 4, 2015, pp. 30-33.
Concretely, it is interpreted as a pressure being introduced in the associated state equation. This cosmological constant has generated phase transition behaviors which arise naturally in the black hole physics [18–21]. Precisely, the Hawking-Page phase transition has been considered a first phase ...
b, The autocorrelation function of the summed light curve, where the autocorrelation is defined in equation (6). The dotted line is a fit to the light curve with a 3rd order Savitzky-Golay smoothing filter with a 101 bin smoothing window. The blue shaded regions delineate regions of 1 ...
There does not exist black hole solutions without a hair in DEGB theory. If we have = 0 in DEGB theory, dilaton equation of motion in Eq. (4) has only the RG2 B term. However, the GB term should be non-zero, so it cannot satisfy Eq. (4). The coupling α could be absorbed...
In order to finish this argumentation, we show a simple calculation that better captures the effect of the hyperscaling violation in the global properties of (4). Through a compact- ification of the spacetime similar to that of AdS or Lifshitz spacetimes [40,41], it is possible to identify...