Topological black hole in the theory with nonminimal derivative coupling with power-law Maxwell field and its thermodynamics

Abstract

We obtain topological black hole solutions in scalar-tensor gravity with nonminimal derivative coupling between scalar and tensor components of gravity and power-law Maxwell field minimally coupled to gravity. The obtained solutions can be treated as a generalization of previously derived charged solutions with standard Maxwell action [59]. We examine the behaviour of obtained metric functions for some asymptotic values of distance and coupling. To obtain information about singularities of the metrics we calculate Kretschmann scalar. We also examine the behaviour of gauge potential and show that it is necessary to impose some constraints on parameter of nonlinearity in order to obtain reasonable behaviour of the filed. The next part of our work is devoted to the examination of black hole's thermodynamics. Namely we obtain black hole's temperature and investigate it in general as well as in some particular cases. To introduce entropy we use well known Wald procedure which can be applied to quite general diffeomorphism-invariant theories. We also extend thermodynamic phase space by introducing thermodynamic pressure related to cosmological constant and as a result we derive generalized first law and Smarr relation. The extended thermodynamic variables also allow us to construct Gibbs free energy and its examination gives important information about thermodynamic stability and phase transitions. We also calculate heat capacity of the black holes which demonstrates variety of behaviour for different values of allowed parameters. *

Dilaton black holes with power law electrodynamics

“…which is compatible with the result of refs. [37,42,46]. Also, it recovers the mass of Reissner-Nordströ m-A(dS) black holes when the dilatonic potential disappears.…”

“…In the absence of dilaton field (i.e β = 0 = γ ) this condition reduces as 2p−3 2p−1 < 0 or equivalently 1 2 < p < 3 2 , which is just the condition encountered in ref. [23,46]. Now, Eq.…”

Universal p-form black holes in generalized theories of gravity

“…Electric solutions in higher dimensions have been obtained in [65] (also for more general powers of F μν F μν in (37)).…”

Can the power Maxwell nonlinear electrodynamics theory remove the singularity of electric field of point-like charges at their locations?

“…The PM NED theory is richer than linear Maxwell's theory and in a special case (unit power), reduces to linear Maxwell's theory [33][34][35][36][37][38]. In is notable that the coupling of PM NED theory with gravity always is an interesting subject which attracted significant attentions because of specific properties [39][40][41][42][43][44][45][46][47][48][49][50]. Another attractive feature of the PM NED theory is related to its conformal invariant.…”