Publications (21)
Black hole entropy functions and attractor equations
G. L. Cardoso, B. de Wit, S. Mahapatra
The entropy and the attractor equations for static extremal black hole solutions follow from a variational principle based on an entropy function. In the general case such an entro…
The mixed black hole partition function for the STU model
G. L. Cardoso, J. R. David, B. de Wit +1
We evaluate the mixed partition function for dyonic BPS black holes using the recently proposed degeneracy formula for the STU model. The result factorizes into the OSV mixed parti…
Small-scale cosmic ray anisotropy observed by the GRAPES-3 experiment at TeV energies
M. Chakraborty, S. Ahmad, A. Chandra +35
GRAPES-3 is a mid-altitude (2200 m) and near equatorial ( North) air shower array, overlapping in its field of view for cosmic ray observations with experiments that…
Spontaneous breaking of time reversal symmetry in strongly interacting two dimensional electron layers in silicon and germanium
S. Shamim, S. Mahapatra, G. Scappucci +3
We report experimental evidence of a remarkable spontaneous time reversal symmetry breaking in two dimensional electron systems formed by atomically confined doping of phosphorus (…
Intersecting 6-branes from new 7-manifolds with G_2 holonomy
K. Behrndt, G. Dall'Agata, D. Lüst +1
We discuss a new family of metrics of 7-manifolds with G_2 holonomy, which are R^3 bundles over a quaternionic space. The metrics depend on five parameters and have two Abelian iso…
Effect of magnetic phase coexistence on spin-phonon coupling and magnetoelectric effect in polycrystalline Sm0.5Y0.5Fe0.58Mn0.42O3
S. Raut, S. Chakravarty, H. S Mohanty +15
The polycrystalline co-doped samples of Sm0.5Y0.5Fe0.58Mn0.42O3 were prepared by solid-state reaction route and its various physical properties with their correlations have been in…