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JHEP07(2016)004
Published for SISSA by Springer
Received: June 15, 2016
Accepted: June 15, 2016
Published: July 1, 2016
Dyonic (A)dS black holes in Einstein-Born-Infeld
theory in diverse dimensions
Shoulong Li,
a
H. L¨u
b
and Hao Wei
a
a
School of Physics, Beijing Institute of Technology,
5 South Zhongguancun Street, Beijing 100081, China
b
Center for Advanced Quantum Studies,
Department of Physics, Beijing Normal University,
19 Xinjiekouwai Street, Beijing 100875, China
E-mail:
sllee phys@bit.edu.cn, mrhonglu@gmail.com, haowei@bit.edu.cn
Abstract: We study Einstein-Born-Infeld gravity and construct the dyonic (A)dS planar
black holes in general even dimens i ons, that carry both the electric charge and magnetic
fluxes along the planar space. In four dimensions, the solution can be constructe d with
also spherical and hyperbolic topologies. We study the black hole thermodynamics and
obtain the first law. We also classify the singularity structure.
Keywords: Black Holes, Classical Theorie s of Gravity, Spacetime Singularities
ArXiv ePrint: 1606.02733
Open Access,
c
The Authors.
Article funded by SCOAP
3
.
doi:
10.1007/JHEP07(2016)004
JHEP07(2016)004
Contents
1 Introduction
1
2 EBI and its equations of motion 3
3 Dyonic black hole in four dimensions 4
3.1 Local solution 4
3.2 Thermodynamics 5
3.3 Wald formalism 6
3.4 Singularity structures 8
4 Generalization to higher dimensions 9
4.1 Local solutions 9
4.2 Thermodynamics 10
4.3 Some explicit ex am pl e s 12
4.3.1 Pure electric s ol uti on s 12
4.3.2 Pure magnetic solu ti ons 12
4.3.3 Dyonic solutions 13
4.3.4 A more general topology 14
5 Conclusion 15
1 Introduction
In 1934, Born and Infeld [1] proposed an elegant nonlinear version of electrodynamics
that successfully removes the divergence of self-e ne r gy of a p oi nt-like charge in Maxwell’s
theory of electrodynamic s. The Lagrangian density of the Born-Infeld (BI) theory in D-
dimensional Minkowski spacetime is given by
L = −b
2
s
−det
η
µν
+
F
µν
b
+ b
2
, (1.1)
where η
µν
= diag(−1, 1, 1, 1) is the Minkowski metric, F
µν
= 2∂
[µ
A
ν]
is the Faraday ten-
sor and A = A
µ
dx
µ
is the Maxwell gauge potential. BI theory contains a dimensionful
parameter b, and in the limit b → ∞, BI theory reduces to the Maxwell theory,
L = −
1
4
F
2
+ O
1
b
2
. (1.2)
In the limit b → 0, the Lagrangian in four dimensions becomes F ∧ F which is a total
derivative. The limit is generally singular in h i gher dimensions.
– 1 –
JHEP07(2016)004
BI theory has enjoyed further attentions since the invention of string theory. It turns
out that the BI action can arise from string theory [
2], describing the low energy dynamics
of D-branes [
3]. We refer to e.g. [4, 5] for some comprehensive reviews on the BI theory
in s tr i ng theory. The special Born-Infeld-like nonlinear form is al s o very useful to con-
struct analogous new theori e s, such as Dirac-Born-Infeld (DBI) inflation theory [
6, 7] and
Eddington-inspired Born-Infeld (EiBI) cosmologies [
8]. BI theory can als o be adopted to
explore issues of dark energy [
9, 10].
In this paper, we focus on the study of black holes in Einstein -B orn -Inf el d (EBI)
theory. The most general static type-D metric of the BI theory in four dimensions was
constructed in [
11]. (See also [12] and [13].) The sp he ri c al l y -s y mme t ri c solution was
generalized to arbitrary D dimensions in [
14] wher e the black hole thermodynamics was
studied. The black hole solutions was also generalized to include different topologies [
15].
The Born-Infel d black hole solutions were also studied in Einstein theory with a dilaton
field [
16] and in the modified gravity theories such as Gauss-Bonnet theory [17], Lovelock
theory [
18], Brans-Dicke theory [19], f(T ) theory [20], massive gravity [21] and so on. The
extended thermodynamics [
14–20, 22–24], geodesics [25, 26] , and AdS/CFT correspondence
properties [
27–29] were studied too. Other Born-Infeld solutions are also studied, for
example, thin-shell wormhol e s [
30].
(A)dS black hole solutions in BI theory considered in literature typically involves only
either the electric or magnetic charges. Although the dyonic black hole in EBI theory was
constructed in [
11], it is written in the general (static) type-D form. The global structure
in the spherically symmetric form was analysed in [
25] for the asymptotically-flat case. In
this paper, we shall first study the dyonic (A)dS black holes in the EBI theory in four
dimensions with general topologie s, focus on analysi ng the black hole thermodynamics and
singularity structure. We then construct dyonic AdS planar black holes in arbitrary even
dimensions, where the solutions carry both the elec t r i c flux as well as the magnetic 2-form
flux along the planar space.
Interest i ngl y in almost all the prev i ous works on constructing black holes, the equiv-
alent action in four dimensions was us ed , rather than the original one. In D = 4, the
Lagrangian can be equivalently expressed as [1]
L = b
2
− b
2
p
1 + I
1
+ I
2
, (1.3)
where
I
1
=
1
2b
2
F
µν
F
µν
=
B
2
− E
2
b
2
, I
2
= −
1
16b
4
F
µν
e
F
µν
2
= −
(E · B)
2
b
4
, (1.4)
in which E and B are electric and magnetic fields, and
e
F
µν
=
1
2
ǫ
µνρσ
F
ρσ
=
1
2
p
−det(η
ab
)
ε
µνρσ
F
ρσ
, (1.5)
where ε
µνρσ
is a tensor density with ε
0123
= 1.
The equivalence of (1.3) and (1.1) is only true in four dimensions; it is no longer valid in
higher dimensions. However, if one considers only static solutions carrying electric charges,
– 2 –
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