Physics Letters B 800 (2020) 135032
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Physics Letters B
www.elsevier.com/locate/physletb
Holographic entanglement entropy, subregion complexity and Fisher
information metric of ‘black’ non-susy D3 brane
Aranya Bhattacharya
a,b,∗
, Shibaji Roy
a,b
a
Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Calcutta 700064, India
b
Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400085, India
a r t i c l e i n f o a b s t r a c t
Article history:
Received
27 September 2019
Accepted
18 October 2019
Available
online 22 October 2019
Editor:
N. Lambert
The BPS D3 brane has a non-supersymmetric cousin, called the non-susy D3 brane, which is also a
solution of type IIB string theory. The corresponding counterpart of black D3 brane is the ‘black’ non-susy
D3 brane and like the BPS D3 brane, it also has a decoupling limit, where the decouple d geometry (in
the case we are interested, this is asymptotically AdS
5
× S
5
) is the holographic dual of a non-conformal,
non-supersymmetric QFT in (3 +1)-dimensions. In this QFT we compute the entanglement entropy (EE),
the complexity and the Fisher information metric holographically using the above mentioned geometry
for spherical subsystems. The fidelity and the Fisher information metric have been calculated from the
regularized extremal volume of the codimension one time slice of the bulk geometry using two different
proposals in the literature. Although for AdS black hole both the proposals give identical results, the
results differ for the non-supersymmetric background.
© 2019 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
In recent years, significant amount of work has been done to
understand the gravity duals of certain measures of quantum in-
formation
[1], namely, the entanglement entropy (EE) [2–10], the
fidelity susceptibility or Fisher information metric [11–17], the Bu-
res
metric [18] and so on. The AdS/CFT correspondence [19,20]
appears
to be the most useful tool for this purpose. The pri-
mary
motivation in this came from the seminal work by Ryu and
Takayanagi [21, 22], where they gave a proposal to quantify the EE
holographically, particularly, in case of spacetimes with constant
negative curvature. Results obtained using their holographic pro-
posal
matched exactly with those of the corresponding CFT duals
in low dimensions. As it is quite well-known by now, the EE is
a good way to measure the amount of quantum information of a
bipartite system. One way to quantify this information is to cal-
culate
the von Neumann entropy of a bipartite system where the
system is divided into two parts named, A and B. The von Neu-
mann
entropy of part A is defined as S
A
=−Tr(ρ
A
log ρ
A
), where
ρ
A
= Tr
B
(ρ
tot
) is the reduced density matrix on A obtained by
*
Corresponding author.
E-mail
addresses: aranya.bhattacharya@saha.ac.in (A. Bhattacharya),
shibaji.roy@saha.ac.in (S. Roy).
tracing out on B, the complement of A, of the density matrix of
the total system ρ
tot
. Holographically it can be computed from the
Ryu-Takayanagi formula (as proposed by them) [21,22]
S
E
=
Area(γ
min
A
)
4G
N
(1)
where γ
min
A
is the d-dimensional minimal area (time-sliced)
surface in AdS
d+2
space whose boundary matches with the
boundary of the subsystem A, i.e., ∂γ
min
A
= ∂ A and G
N
is the
(d + 2)-dimensional Newton’s constant. As mentioned earlier, for
lower spacetime dimensions (AdS
3
/CFT
2
) the corresponding results
matched. Since then, this dual description has been checked for
several cases and it’s regime of application has been extended to
cases of higher dimensional and asymptotically AdS spacetimes
[23–25]. For asymptotic AdS cases, one finds extra finite contribu-
tions
to the EE other than that of the pure AdS spacetimes which
has also been studied in details in several works. These terms are
found to follo w certain relations analogous to the thermodynam-
ical
relations called, the entanglement thermodynamics [23,24,26,
27].
Complexity
is another measure of entanglement between quan-
tum
systems and a holographic definition in the context of eternal
AdS black hole [28]was originally proposed by Susskind et al.
[29–32]through two different notions, one from the volume of the
https://doi.org/10.1016/j.physletb.2019.135032
0370-2693/
© 2019 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
.