Found 4 result(s)

04.11.2015 (Wednesday)

Black holes, Stokes flows and DC transport at strong coupling

Triangular Seminar Aristomenis Donos (Durham U.)

at:
16:30 IC
room LT1
abstract:

Certain materials, such as the cuprate superconductors and heavy fermion materials exhibit fascinating, yet hard to explain transport properties. Holography provides a consistent framework to examine linear response and in particular transport of strongly coupled matter. I will discuss momentum dissipation in holography and show that DC transport is fixed via a Stokes flow of an "auxiliary fluid" residing on the horizon of black holes.

27.10.2010 (Wednesday)

Lifshitz Solutions in String and M-Theory

Regular Seminar Aristomenis Donos (Imperial)

at:
13:00 KCL
room 423
abstract:

Condensed matter systems at quantum critical points can be described by strongly coupled field theories exhibiting anisotropic scale invariance. Lifshitz geometries been proposed to be holographic duals to these theories. I will discuss top down constructions of Lifshitz geometries in Type IIB and D=11 dimensional supergravities.

04.12.2008 (Thursday)

Bubbling and AdS Solutions in string theory

Regular Seminar Aristomenis Donos (DESY)

at:
14:00 QMW
room 410
abstract:

23.01.2008 (Wednesday)

Looking for higher dimensional droplets in AdS5 x S5

Regular Seminar Aristomenis Donos (DESY)

at:
14:00 IC
room Huxley 503
abstract:

We will discuss the properties of geometries dual to BPS states of N=4 supersymmetric Yang-Mills theory. Despite the non-linearity of the problem, we develop a universal bubbling AdS description of these geometries by focusing on the boundary conditions which ensure their regularity. In the 1/8 BPS case, we find that the S3 cycle shrinks to zero size on a five-dimensional locus inside the six-dimensional base. Enforcing regularity of the full solution requires that the interior of a smooth, generally disconnected five-dimensional surface be removed from the base. The AdS5 x S5 ground state corresponds to excising the interior of an S5, while the 1/8 BPS excitations correspond to deformations (including topology change) of the S5 and/or the excision of additional droplets from the base.