Physics Letters B 758 (2016) 106–112
Contents lists available at ScienceDirect
Physics Letters B
www.elsevier.com/locate/physletb
Noncommutative effects of spacetime on holographic superconductors
Debabrata Ghorai
a
, Sunandan Gangopadhyay
b,c,∗
a
S.N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700098, India
b
Department of Physics, West Bengal State University, Barasat, India
c
Inter University Centre for Astronomy & Astrophysics, Pune, India
a r t i c l e i n f o a b s t r a c t
Article history:
Received
13 March 2016
Received
in revised form 14 April 2016
Accepted
3 May 2016
Available
online 6 May 2016
Editor:
M. Cveti
ˇ
c
The Sturm–Liouville eigenvalue method is employed to analytically investigate the properties of
holographic superconductors in higher dimensions in the framework of Born–Infeld electrodynamics
incorporating the effects of noncommutative spacetime. In the background of pure Einstein gravity in
noncommutative spacetime, we obtain the relation between the critical temperature and the charge
density. We also obtain the value of the condensation operator and the critical exponent. Our findings
suggest that the higher value of noncommutative parameter and Born–Infeld parameter make the
condensate harder to form. We also observe that the noncommutative structure of spacetime makes
the critical temperature depend on the mass of the black hole and higher value of black hole mass is
favourable for the formation of the condensate.
© 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license
(http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP
3
.
1. Introduction
Holographic superconductors have been studied extensively in
recent times. Their importance lies in the fact that they mimic
some properties of high T
c
superconductors. The interest rose af-
ter
the demonstration in [1] that an Abelian Higgs model in AdS
spacetime leads to a spontaneous symmetry breaking and thus giv-
ing
rise to a scalar hair near the horizon of the black hole. The
important ingredient which goes in the construction of such holo-
graphic
superconductor models is the correspondence between
gravity and gauge theory, namely, the AdS/CFT correspondence [2].
Spacetime
noncommutativity has been another prominent area
of research in recent years. The idea of noncommutative (NC)
spacetime, first formally introduced by Snyder [3] back in 1947
was not considered seriously by other scientists till recently when
such a structure emerged naturally from investigations carried out
in string theory [4]. It was in this paper that NC field theory was
resurrected and rules were given to move from ordinary quantum
field theory (QFT) to NC QFT. In more recent times, a noncommu-
tative
inspired Schwarzschild metric was obtained in [5,6]. Here
the effect of noncommutativity was introduced through a smeared
matter source which was then used to solved Einstein’s equation of
*
Corresponding author.
E-mail
addresses: debanuphy123@gmail.com, debabrataghorai@bose.res.in
(D. Ghorai),
sunandan.gangopadhyay@gmail.com (S. Gangopadhyay).
general relativity. An important aspect of this black hole solution
was the removal of black hole singularity. The thermodynamics of
this black hole solution was investigated in details in [7].
In
this paper, we want to investigate the role of NC geome-
try
on the AdS/CFT duality, in particular to study its effect on
holographic superconductor models in higher dimensions. Such a
study had been carried out earlier in [8] in 4-dimensions. Here we
generalize this analysis to arbitrary dimensions by considering the
d-dimensional generalization of the NC Schwarzschild black hole.
We also present expressions for the critical temperature which is
more accurate than the one given in [8] as will be clear in the
subsequent discussion. Further we consider Born–Infeld (BI) elec-
trodynamics
thereby including the effect of non-linearity in the
analysis. There are quite a few reasons which make it worthwhile
to study the effect of BI electrodynamics. First of all, it is the
only non-linear theory that remains invariant under electromag-
netic
duality. Another intriguing feature is that it has a nice weak
field limit [9–12]. It also finds remarkable application in string the-
ory
[13,14]. We would like to mention that the technique that we
have adopted in this paper to obtain the relation between the crit-
ical
temperature and the charge density is the Sturm–Liouville (SL)
eigenvalue approach.
This
paper is organized as follows. In section 2, we show the
basic holographic set up in noncommutative spacetime in the
background of electrically charged black hole in arbitrary dimen-
sion.
In section 3, taking into account the effect of the Born–Infeld
electrodynamics, we have derived the relation between critical
http://dx.doi.org/10.1016/j.physletb.2016.05.011
0370-2693/
© 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by
SCOAP
3
.