Zobrazeno 1 - 10
of 33
pro vyhledávání: '"Ramirez, David M."'
Autor:
Ramirez, David M.
Recent work has suggested an intriguing relation between quantum chaos and energy density correlations, known as pole skipping. We investigate this relationship in two dimensional conformal field theories on a finite size spatial circle by studying t
Externí odkaz:
http://arxiv.org/abs/2009.00500
Autor:
Lowe, David A., Ramirez, David M.
With a view to understanding extended-BMS symmetries in the framework of the $AdS_4/CFT_3$ correspondence, asymptotically AdS geometries are constructed with null impulsive shockwaves involving a discontinuity in superrotation parameters. The hologra
Externí odkaz:
http://arxiv.org/abs/2007.02851
We study out-of-time ordered four-point functions in two dimensional conformal field theories by suitably analytically continuing the Euclidean correlator. For large central charge theories with a sparse spectrum, chaotic dynamics is revealed in an e
Externí odkaz:
http://arxiv.org/abs/1812.05585
Autor:
Geracie, Michael, Haehl, Felix M., Loganayagam, R., Narayan, Prithvi, Ramirez, David M., Rangamani, Mukund
Publikováno v:
Phys. Rev. D 97, 105023 (2018)
We examine, in a quantum mechanical setting, the Hilbert space representation of the BRST symmetry associated with Schwinger-Keldysh path integrals. This structure had been postulated to encode important constraints on influence functionals in coarse
Externí odkaz:
http://arxiv.org/abs/1712.04459
Autor:
Ciobanu, Tudor, Ramirez, David M.
In this paper we investigate the behavior of the shear hydrodynamic response functions in a simple holographic model exhibiting momentum relaxation. We compute several stress tensor response functions in the transverse channel, and from there derive
Externí odkaz:
http://arxiv.org/abs/1708.04997
The ratio of shear viscosity to entropy density, $\eta/s$, is computed in various holographic geometries that break translation invariance (but are isotropic). The shear viscosity does not have a hydrodynamic interpretation in such backgrounds, but d
Externí odkaz:
http://arxiv.org/abs/1601.02757
Strongly disordered and strongly interacting quantum critical points are difficult to access with conventional field theoretic methods. They are, however, both experimentally important and theoretically interesting. In particular, they are expected t
Externí odkaz:
http://arxiv.org/abs/1508.04435
We construct planar black hole solutions in AdS_3 and AdS_4 in which the boundary CFT is perturbed by marginally relevant quenched disorder. We show that the entropy density of the horizon has the scaling temperature dependence s \sim T^{(d-1)/z} (wi
Externí odkaz:
http://arxiv.org/abs/1504.03324
Autor:
Hartnoll, Sean A., Ramirez, David M.
Gravitational instantons with NUT charge are magnetic monopoles upon dimensional reduction. We determine whether NUT charge can proliferate via the Polyakov mechanism and partially screen gravitational interactions. In semiclassical Einstein gravity,
Externí odkaz:
http://arxiv.org/abs/1312.4536
For free fermions at finite density, the Pauli exclusion principle is responsible for the existence of a Fermi surface and the consequent presence of low energy spectral weight over a finite range of momenta. We investigate the extent to which this e
Externí odkaz:
http://arxiv.org/abs/1210.1590