33 research outputs found
Semiclassical String Solutions on 1/2 BPS Geometries
We study semiclassical string solutions on the 1/2 BPS geometry of type IIB
string theory characterized by concentric rings on the boundary plane. We
consider both folded rotating strings carrying nonzero R-charge and circular
pulsating strings. We find that unlike rotating strings, as far as circular
pulsating strings are concerned, the dynamics remains qualitatively unchanged
when the concentric rings replace AdS_5\times S^5. Using the gravity dual we
have also studied the Wilson loop of the corresponding gauge theory. The result
is qualitatively the same as that in AdS_5\times S^5 in the global coordinates
where the corresponding gauge theory is defined on S^3\times R. We show that
there is a correction to 1/L leading order behavior of the potential between
external objects.Comment: 17 pages, latex file, v2: refs. adde
Holographic entanglement entropy and mutual information in deformed field theories at finite temperature
In this paper we have studied the effect of deformation and temperature on
holographic entanglement entropy and mutual information between two subsystems
in a deformed field theory at finite temperature. The
deformation operator in field theory introduces a cut-off in the dual gravity
background. We define different regimes of parameters and calculate the
entanglement entropy and mutual information analytically. We observe that
temperature and deformation parameter have similar effects on entanglement
entropy and mutual information. They both lead to decrease in mutual
information or somehow the correlation between the two subsystems.
Interestingly we observe the emergence of correction terms in entanglement
entropy and mutual information that are universal and do not depend on the
scale of the non-local operator.Comment: 27 pages, 4 figure
The investigation of the effects of privatization implementation on the performance of post office: A case study in Guilan General Post Office, Iran
The present article aims at the investigation of privatization of Iran Post Office. The emphasis here is placed upon Guilan Province General Post Office. Therefore the main question of the present article is whether the operation of Guilan province General Post Office after the implementation of privatization has improved in comparison with the previous years before it was put into practice or not. The present study is quantitative (survey research) and library data collection in nature
The investigation of the effects of privatization implementation on the performance of post office: A case study in Guilan General Post Office, Iran
The present article aims at the investigation of privatization of Iran Post Office. The emphasis here is placed upon Guilan Province General Post Office. Therefore the main question of the present article is whether the operation of Guilan province General Post Office after the implementation of privatization has improved in comparison with the previous years before it was put into practice or not. The present study is quantitative (survey research) and library data collection in nature