296 research outputs found
Quantum radiation from superluminal refractive index perturbations
We analyze in detail photon production induced by a superluminal refractive
index perturbation in realistic experimental operating conditions. The
interaction between the refractive index perturbation and the quantum vacuum
fluctuations of the electromagnetic field leads to the production of photon
pairs.Comment: 4 page
Analogue Gravity and ultrashort laser pulse filamentation
Ultrashort laser pulse filaments in dispersive nonlinear Kerr media induce a
moving refractive index perturbation which modifies the space-time geometry as
seen by co-propagating light rays. We study the analogue geometry induced by
the filament and show that one of the most evident features of filamentation,
namely conical emission, may be precisely reconstructed from the geodesics. We
highlight the existence of favorable conditions for the study of analogue black
hole kinematics and Hawking type radiation.Comment: 4 pages, revised versio
Spacetime geometries and light trapping in travelling refractive index perturbations
In the framework of transformation optics, we show that the propagation of a
locally superluminal refractive index perturbation (RIP) in a Kerr medium can
be described, in the eikonal approximation, by means of a stationary metric,
which we prove to be of Gordon type. Under suitable hypotheses on the RIP, we
obtain a stationary but not static metric, which is characterized by an
ergosphere and by a peculiar behaviour of the geodesics, which are studied
numerically, also accounting for material dispersion. Finally, the equation to
be satisfied by an event horizon is also displayed and briefly discussed.Comment: 14 pages, 7 figure
The Asymptotic Dynamics of two-dimensional (anti-)de Sitter Gravity
We show that the asymptotic dynamics of two-dimensional de Sitter or anti-de
Sitter Jackiw-Teitelboim (JT) gravity is described by a generalized
two-particle Calogero-Sutherland model. This correspondence is established by
formulating the JT model of (A)dS gravity in two dimensions as a topological
gauge theory, which reduces to a nonlinear 0+1-dimensional sigma model on the
boundary of (A)dS space. The appearance of cyclic coordinates allows then a
further reduction to the Calogero-Sutherland quantum mechanical model.Comment: 16 pages, LaTeX, no figures, uses JHEP.cls. v2: Some references and
comments added. v3: Minor errors correcte
Reply to Comment on: Hawking radiation from ultrashort laser pulse filaments
A comment by R. Schutzhold et al. raises possible concerns and questions
regarding recent measurements of analogue Hawking radiation. We briefly reply
to the opinions expressed in the comment and sustain that the origin of the
radiation may be understood in terms of Hawking emission
Cosmological solutions from fake N=2 EYM supergravity
We characterise the (fake) supersymmetric solutions of Wick-rotated N=2 d=4
gauged supergravity coupled to non-Abelian vector multiplets. In the time-like
case we obtain generalisations of Kastor & Traschen's cosmological black holes:
they have a specific time-dependence and the base-space must be 3-dimensional
hyperCR/Gauduchon-Tod space. In the null-case, we find that the metric has a
holonomy contained in Sim(2), give a general characterisation of the solutions,
and give some examples. Finally, we point out that in some cases the solutions
we found are non-BPS solutions to N=2 d=4 supergravity coupled to vector
multiplets.Comment: 30 pages. Comments and references added, typos correcte
Quantum Effects for the Dirac Field in Reissner-Nordstrom-AdS Black Hole Background
The behavior of a charged massive Dirac field on a Reissner-Nordstrom-AdS
black hole background is investigated. The essential self-adjointness of the
Dirac Hamiltonian is studied. Then, an analysis of the discharge problem is
carried out in analogy with the standard Reissner-Nordstrom black hole case.Comment: 18 pages, 5 figures, Iop styl
Noncommutative Gravity in two Dimensions
We deform two-dimensional topological gravity by making use of its gauge
theory formulation. The obtained noncommutative gravity model is shown to be
invariant under a class of transformations that reduce to standard
diffeomorphisms once the noncommutativity parameter is set to zero. Some
solutions of the deformed model, like fuzzy AdS_2, are obtained. Furthermore,
the transformation properties of the model under the Seiberg-Witten map are
studied.Comment: 20 pages, LaTeX, references and some comments adde
Emission of correlated photon pairs from superluminal perturbations in dispersive media
We develop a perturbative theory that describes a superluminal refractive
perturbation propagating in a dispersive medium and the subsequent excitation
of the quantum vacuum zero-point fluctuations. We find a process similar to the
anomalous Doppler effect: photons are emitted in correlated pairs and mainly
within a Cerenkov-like cone, one on the forward and the other in backward
directions. The number of photon pairs emitted from the perturbation increases
strongly with the degree of superluminality and under realizable experimental
conditions, it can reach up to ~0.01 photons per pulse. Moreover, it is in
principle possible to engineer the host medium so as to modify the effective
group refractive index. In the presence of "fast light" media, e.g. a with
group index smaller than unity, a further ~10x enhancement may be achieved and
the photon emission spectrum is characterized by two sharp peaks that, in
future experiments would clearly identify the correlated emission of photon
pairs.Comment: 9 pages, 7 figure
Supersymmetric gyratons in five dimensions
We obtain the gravitational and electromagnetic field of a spinning radiation
beam-pulse (a gyraton) in minimal five-dimensional gauged supergravity and show
under which conditions the solution preserves part of the supersymmetry. The
configurations represent generalizations of Lobatchevski waves on AdS with
nonzero angular momentum, and possess a Siklos-Virasoro reparametrization
invariance. We compute the holographic stress-energy tensor of the solutions
and show that it transforms without anomaly under these reparametrizations.
Furthermore, we present supersymmetric gyratons both in gauged and ungauged
five-dimensional supergravity coupled to an arbitrary number of vector
supermultiplets, which include gyratons on domain walls.Comment: 25 pages, no figures, uses JHEP3.cls. Final version to appear in CQ
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