495 research outputs found
Observation of interspecies Feshbach resonances in an ultracold Rb-Cs mixture
We report on the observation of interspecies Feshbach resonances in an
ultracold, optically trapped mixture of Rb and Cs atoms. In a magnetic field
range up to 300 G we find 23 interspecies Feshbach resonances in the lowest
spin channel and 2 resonances in a higher channel of the mixture. The
extraordinarily rich Feshbach spectrum suggests the importance of different
partial waves in both the open and closed channels of the scattering problem
along with higher-order coupling mechanisms. Our results provide, on one hand,
fundamental experimental input to characterize the Rb-Cs scattering properties
and, on the other hand, identify possible starting points for the association
of ultracold heteronuclear RbCs molecules.Comment: 7 pages, 3 figures, 1 tabl
Experimental Evidence for Efimov Quantum States
Three interacting particles form a system which is well known for its complex
physical behavior. A landmark theoretical result in few-body quantum physics is
Efimov's prediction of a universal set of weakly bound trimer states appearing
for three identical bosons with a resonant two-body interaction. Surprisingly,
these states even exist in the absence of a corresponding two-body bound state
and their precise nature is largely independent of the particular type of the
two-body interaction potential. Efimov's scenario has attracted great interest
in many areas of physics; an experimental test however has not been achieved.
We report the observation of an Efimov resonance in an ultracold thermal gas of
cesium atoms. The resonance occurs in the range of large negative two-body
scattering lengths and arises from the coupling of three free atoms to an
Efimov trimer. We observe its signature as a giant three-body recombination
loss when the strength of the two-body interaction is varied near a Feshbach
resonance. This resonance develops into a continuum resonance at non-zero
collision energies, and we observe a shift of the resonance position as a
function of temperature. We also report on a minimum in the recombination loss
for positive scattering lengths, indicating destructive interference of decay
pathways. Our results confirm central theoretical predictions of Efimov physics
and represent a starting point from which to explore the universal properties
of resonantly interacting few-body systems.Comment: 8 pages, 4 figures, Proceedings of ICAP-2006 (Innsbruck
Holographic Renormalization Group Flows: The View from Ten Dimensions
The holographic description of supersymmetric RG flows in supergravity is
considered from both the five-dimensional and ten-dimensional perspectives. An
N=1* flow of N=4 super-Yang Mills is considered in detail, and the infra-red
limit is studied in terms of IIB supergravity in ten dimensions. Depending on
the vevs and the direction of approach to the core, the supergravity solution
can be interpreted in terms of either 5-branes or 7-branes. Generally, it is
shown that it is essential to use the ten-dimensional description in order to
study the infra-red asymptotics in supergravity.Comment: Talk presented at the Second Gursey Memmorial Conference; 14 pages;
Latex; IOP Macro
Supersymmetric Charged Clouds in AdS_5
We consider supersymmetric holographic flows that involve background gauge
fields dual to chemical potentials in the boundary field theory. We use a
consistent truncation of gauged N=8 supergravity in five dimensions and we give
a complete analysis of the supersymmetry conditions for a large family of
flows. We examine how the well-known supersymmetric flow between two fixed
points is modified by the presence of the chemical potentials and this yields a
new, completely smooth, solution that interpolates between two global AdS
spaces of different radii and with different values of the chemical potential.
We also examine some black-hole-like singular flows and a new
non-supersymmetric black hole solution. We comment on the interpretation of our
new solutions in terms of giant gravitons and discuss the implications of our
work for finding black-hole solutions in AdS geometries.Comment: 31 pages, 6 figures; minor corrections, updated reference
String theory and the Classical Stability of Plane Waves
The presence of fields with negative mass-squared typically leads to some
form of instability in standard field theories. The observation that, at least
in the light-cone gauge, strings propagating in plane wave spacetimes can have
worldsheet scalars with such tachyon-like masses suggests that the supergravity
background may itself be unstable. To address this issue, we perform a
perturbative analysis around the type IIB vacuum plane wave, the solution which
most obviously generates worldsheet scalars with negative mass-squared. We
argue that this background is perturbatively stable.Comment: 23 pages, no figures; v2: very minor changes, references added,
version accepted by PR
Penrose Limits and RG Flows
The Penrose-Gueven limit simplifies a given supergravity solution into a
pp-wave background. Aiming at clarifying its relation to renormalization group
flow we study the Penrose-Guven limit of supergravity backgrounds that are dual
to non-conformal gauge theories. The resulting backgrounds fall in a class
simple enough that the quantum particle is exactly solvable. We propose a map
between the effective time-dependent quantum mechanical problem and the RG flow
in the gauge theory. As a testing ground we consider explicitly two Penrose
limits of the infrared fixed point of the Pilch-Warner solution. We analyze the
corresponding gauge theory picture and write down the operators which are the
duals of the low lying string states. We also address RG flows of a different
nature by considering the Penrose-Gueven limit of a stack of N D_p branes. We
note that in the far IR (for p<3)the limit generically has negative
mass-squared. This phenomenon signals, in the world sheet picture, the
necessity to transform to another description. In this regard, we consider
explicitly the cases of M2 from D2 and F1 from D1 .Comment: 35 pp, 6 figure
Semiclassical quantization of Rotating Strings in Pilch-Warner geometry
Some of the recent important developments in understanding string/ gauge
dualities are based on the idea of highly symmetric motion of ``string
solitons'' in geometry originally suggested by Gubser,
Klebanov and Polyakov. In this paper we study symmetric motion of certain
string configurations in so called Pilch-Warner geometry. The two-form field
breaks down the supersymmetry to but for the string
configurations considered in this paper the classical values of the energy and
the spin are the same as for string in . Although trivial at
classical level, the presence of NS-NS antisymmetric field couples the
fluctuation modes that indicates changes in the quantum corrections to the
energy spectrum. We compare our results with those obtained in the case of
pp-wave limit in hep-th/0206045.Comment: 31 pages, no figures, v2 - a few typos correcte
Consistent reductions of IIB*/M* theory and de Sitter supergravity
We construct consistent non-linear Kaluza Klein reduction ansatze for a
subset of fields arising from the reduction of IIB* and M* theory on dS_5 x H^5
and dS_4 x AdS_7, respectively. These reductions yield four and
five-dimensional de Sitter supergravities, albeit with wrong sign kinetic
terms. We also demonstrate that the ansatze may be used to lift multi-centered
de Sitter black hole solutions to ten and eleven dimensions. The lifted dS_5
black holes correspond to rotating E4-branes of IIB* theory.Comment: 27 pages, late
Constructing Lifshitz solutions from AdS
Under general assumptions, we show that a gravitational theory in d+1
dimensions admitting an AdS solution can be reduced to a d-dimensional theory
containing a Lifshitz solution with dynamical exponent z=2. Working in a d=4,
N=2 supergravity setup, we prove that if the AdS background is N=2
supersymmetric, then the Lifshitz geometry preserves 1/4 of the supercharges,
and we construct the corresponding Killing spinors. We illustrate these results
in examples from supersymmetric consistent truncations of type IIB
supergravity, enhancing the class of known 4-dimensional Lifshitz solutions of
string theory. As a byproduct, we find a new AdS4 x S1 x T(1,1) solution of
type IIB.Comment: 29 pages, no figures; v2 minor corrections, a reference adde
A Note on Supersymmetric Type II Solutions of Lifshitz Type
We discuss a class of supersymmetric type II non-relativistic solutions with
exact or asymptotic scale invariance. As already emerged from previous
investigations, we find a clear correspondence between anisotropic
d-dimensional vacua and relativistic solutions in (d + 1)-dimensions. We will
show that supersymmetric four-dimensional Poincare' invariant backgrounds in
type IIB can descend to analogous solutions with anisotropic scaling in t and
(x, y). This result can be applied to scale invariant theories, domain walls
interpolating between four-dimensional Lifshitz vacua and more general
solutions with only asymptotic or approximate scaling behaviour.Comment: Added subsection on hyperscaling violation example
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