scholarly journals Special dyon-like black hole solution in the model with two Abelian gauge fields and two scalar fields

2020 ◽  
Vol 1690 ◽  
pp. 012143
Author(s):  
F B Belissarova ◽  
K A Boshkayev ◽  
V D Ivashchuk ◽  
A N Malybayev
Keyword(s):  
Black Hole ◽  
Black Hole Solution ◽  
Scalar Fields ◽  
Gauge Fields ◽  
Abelian Gauge

scholarly journals MAXWELL SYMMETRIES AND SOME APPLICATIONS

2013 ◽  
Vol 23 ◽  
pp. 350-356 ◽  
Author(s):  
JOSÉ A. DE AZCÁRRAGA ◽  
KIYOSHI KAMIMURA ◽  
JERZY LUKIERSKI
Keyword(s):  
Gauge Theory ◽  
Gravity Field ◽  
Scalar Fields ◽  
Cosmological Term ◽  
Gauge Fields ◽  
Spin Connection ◽  
Field Equations ◽  
Geometric Framework ◽  
Abelian Gauge ◽  
Poincaré Algebra

The Maxwell algebra is the result of enlarging the Poincaré algebra by six additional tensorial Abelian generators that make the fourmomenta non-commutative. We present a local gauge theory based on the Maxwell algebra with vierbein, spin connection and six additional geometric Abelian gauge fields. We apply this geometric framework to the construction of Maxwell gravity, which is described by the Einstein action plus a generalized cosmological term. We mention a Friedman-Robertson-Walker cosmological approximation to the Maxwell gravity field equations, with two scalar fields obtained from the additional gauge fields. Finally, we outline further developments of the Maxwell symmetries framework.

scholarly journals Merging the weak gravity and distance conjectures using BPS extremal black holes

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Naomi Gendler ◽  
Irene Valenzuela
Keyword(s):  
Black Hole ◽  
Gauge Coupling ◽  
Scalar Fields ◽  
Gauge Fields ◽  
Infinite Field ◽  
Type Iib String Theory ◽  
Bps States ◽  
Distance Limit ◽  
Extremal Black Holes

Abstract We analyze the charge-to-mass structure of BPS states in general infinite-distance limits of $$ \mathcal{N} $$ N = 2 compactifications of Type IIB string theory on Calabi-Yau three-folds, and use the results to sharpen the formulation of the Swampland Conjectures in the presence of multiple gauge and scalar fields. We show that the BPS bound coincides with the black hole extremality bound in these infinite distance limits, and that the charge-to-mass vectors of the BPS states lie on degenerate ellipsoids with only two non-degenerate directions, regardless of the number of moduli or gauge fields. We provide the numerical value of the principal radii of the ellipsoid in terms of the classification of the singularity that is being approached. We use these findings to inform the Swampland Distance Conjecture, which states that a tower of states becomes exponentially light along geodesic trajectories towards infinite field distance. We place general bounds on the mass decay rate λ of this tower in terms of the black hole extremality bound, which in our setup implies $$ \lambda \ge 1/\sqrt{6} $$ λ ≥ 1 / 6 . We expect this framework to persist beyond $$ \mathcal{N} $$ N = 2 as long as a gauge coupling becomes small in the infinite field distance limit.

scholarly journals AdS Black Hole with Phantom Scalar Field

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Limei Zhang ◽  
Xiaoxiong Zeng ◽  
Zhonghua Li
Keyword(s):  
Black Hole ◽  
Black Hole Solution ◽  
Entanglement Entropy ◽  
Scalar Fields ◽  
Schwarzschild Black Hole ◽  
Ricci Flat ◽  
Large Black Hole ◽  
Phantom Scalar ◽  
Strip Geometry ◽  
Phantom Scalar Field

We present an AdS black hole solution with Ricci flat horizon in Einstein-phantom scalar theory. The phantom scalar fields just depend on the transverse coordinates x and y, which are parameterized by the parameter α. We study the thermodynamics of the AdS phantom black hole. Although its horizon is a Ricci flat Euclidean space, we find that the thermodynamical properties of the black hole solution are qualitatively the same as those of AdS Schwarzschild black hole. Namely, there exists a minimal temperature and the large black hole is thermodynamically stable, while the smaller one is unstable, so there is a so-called Hawking-Page phase transition between the large black hole and the thermal gas solution in the AdS space-time in Poincare coordinates. We also calculate the entanglement entropy for a strip geometry dual to the AdS phantom black holes and find that the behavior of the entanglement entropy is qualitatively the same as that of the black hole thermodynamical entropy.

Dyon-Like Black Hole Solutions in the Model with Two Abelian Gauge Fields

2019 ◽  
Vol 25 (4) ◽  
pp. 374-382 ◽  
Author(s):  
M. E. Abishev ◽  
V. D. Ivashchuk ◽  
A. N. Malybayev ◽  
S. Toktarbay
Keyword(s):  
Black Hole ◽  
Gauge Fields ◽  
Abelian Gauge ◽  
Black Hole Solutions

scholarly journals Extended objects in nonperturbative quantum-field theory and the cosmological constant

2017 ◽  
Vol 26 (07) ◽  
pp. 1750074
Author(s):  
Vladimir Dzhunushaliev ◽  
Vladimir Folomeev ◽  
Burkhard Kleihaus ◽  
Jutta Kunz
Keyword(s):  
Energy Density ◽  
Cosmological Constant ◽  
Exact Analytical Solution ◽  
Scalar Fields ◽  
Einstein Equations ◽  
Gauge Fields ◽  
Vacuum Fluctuations ◽  
Abelian Gauge ◽  
Extended Object ◽  
Constant Energy Density

We consider a gravitating extended object constructed from vacuum fluctuations of nonperturbatively quantized non-Abelian gauge fields. An approximate description of such an object is given by two gravitating scalar fields. The object has a core filled with a constant energy density of the vacuum fluctuations of the quantum-fields. The core is located inside a cosmological event horizon. An exact analytical solution of the Einstein equations for such a core is presented. The value of the energy density of the vacuum fluctuations is connected with the cosmological constant.

scholarly journals Universal p-form black holes in generalized theories of gravity

2020 ◽  
Vol 80 (11) ◽  
Author(s):  
Sigbjørn Hervik ◽  
Marcello Ortaggio
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Scalar Fields ◽  
Base Space ◽  
Gauge Fields ◽  
Spaces Of Constant Curvature ◽  
Spacetime Geometry ◽  
Conformally Invariant ◽  
Theories Of Gravity ◽  
Black Hole Solutions

AbstractWe explore how far one can go in constructing d-dimensional static black holes coupled to p-form and scalar fields before actually specifying the gravity and electrodynamics theory one wants to solve. At the same time, we study to what extent one can enlarge the space of black hole solutions by allowing for horizon geometries more general than spaces of constant curvature. We prove that a generalized Schwarzschild-like ansatz with an arbitrary isotropy-irreducible homogeneous base space (IHS) provides an answer to both questions, up to naturally adapting the gauge fields to the spacetime geometry. In particular, an IHS–Kähler base space enables one to construct magnetic and dyonic 2-form solutions in a large class of theories, including non-minimally couplings. We exemplify our results by constructing simple solutions to particular theories such as $$R^2$$ R 2 , Gauss–Bonnet and (a sector of) Einstein–Horndeski gravity coupled to certain p-form and conformally invariant electrodynamics.

scholarly journals Quasinormal modes in the field of a dyon-like dilatonic black hole

2021 ◽  
Vol 81 (5) ◽  
Author(s):  
A. N. Malybayev ◽  
K. A. Boshkayev ◽  
V. D. Ivashchuk
Keyword(s):  
Black Hole ◽  
Black Hole Solution ◽  
Dimensionless Parameter ◽  
Quasinormal Modes ◽  
Eikonal Approximation ◽  
Scalar Fields ◽  
Massless Scalar ◽  
Test Field ◽  
Damping Rate ◽  
Dilatonic Black Hole

AbstractQuasinormal modes of massless test scalar field in the background of gravitational field for a non-extremal dilatonic dyonic black hole are explored. The dyon-like black hole solution is considered in the gravitational 4d model involving two scalar fields and two 2-forms. It is governed by two 2-dimensional dilatonic coupling vectors $${\lambda }_i$$ λ i obeying $${\lambda }_i ({\lambda }_1 + {\lambda }_2) > 0$$ λ i ( λ 1 + λ 2 ) > 0 , $$i =1,2$$ i = 1 , 2 . The first law of black hole thermodynamics is given and the Smarr relation is verified. Quasinormal modes for a massless scalar (test) field in the eikonal approximation are obtained and analysed. These modes depend upon a dimensionless parameter a ($$0 < a \le 2$$ 0 < a ≤ 2 ) which is a function of $${\lambda }_i$$ λ i . For limiting strong ($$a = +0$$ a = + 0 ) and weak ($$a = 2$$ a = 2 ) coupling cases, they coincide with the well-known results for the Schwarzschild and Reissner–Nordström solutions. It is shown that the Hod conjecture, connecting the damping rate and the Hawking temperature, is satisfied for $$0 < a \le 1$$ 0 < a ≤ 1 and all allowed values of parameters.

scholarly journals Gravitational Decoupling in Higher Order Theories

Symmetry ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1598
Author(s):  
Joseph Sultana
Keyword(s):  
Black Hole ◽  
Black Hole Solution ◽  
Scalar Fields ◽  
Higher Order ◽  
Vacuum Field ◽  
Field Equations ◽  
Simple Method ◽  
Seed Solution ◽  
Homotopy Analysis ◽  
Weyl Scalar

Gravitational decoupling via the Minimal Geometric Deformation (MGD) approach has been used extensively in General Relativity (GR), mainly as a simple method for generating exact anisotropic solutions from perfect fluid seed solutions. Recently this method has also been used to generate exact spherically symmetric solutions of the Einstein-scalar system from the Schwarzschild vacuum metric. This was then used to investigate the effect of scalar fields on the Schwarzschild black hole solution. We show that this method can be extended to higher order theories. In particular, we consider fourth order Einstein–Weyl gravity, and in this case by using the Schwarzschild metric as a seed solution to the associated vacuum field equations, we apply the MGD method to generate a solution to the Einstein–Weyl scalar theory representing a hairy black hole solution. This solution is expressed in terms of a series using the Homotopy Analysis Method (HAM).

scholarly journals Dilatonic dyon black hole solutions in the model with two Abelian gauge fields

2018 ◽  
Vol 168 ◽  
pp. 09004
Author(s):  
Medeu Abishev ◽  
Dmitry Ivashchuk ◽  
Kuantay Boshkayev ◽  
Algys Malybayev
Keyword(s):  
Black Hole ◽  
Scalar Field ◽  
Coupling Constants ◽  
Gravitational Mass ◽  
Kinetic Term ◽  
Gauge Fields ◽  
Abelian Gauge ◽  
Dilatonic Black Hole ◽  
Ghost Scalar Field ◽  
Black Hole Solutions

Dilatonic black hole dyon-like solutions in the gravitational 4d model with a scalar field, two 2-forms, two dilatonic coupling constants λi ≠ 0, i = 1,2, obeying λ1 ≠ − λ2 and sign parameter ε = ±1 for scalar field kinetic term are considered. Here ε = −1 corresponds to ghost scalar field. These solutions are defined up to solutions of two master equations for two moduli functions, when λi2 ≠ 1/2 for ε = −1. A set of bounds on gravitational mass and scalar charge are presented by using a certain conjecture on parameters of solutions, when 1 + 2λi2ε > 0, i = 1, 2.

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