2,763 research outputs found
The Moduli Space of the Supersymmetric Yang-Mills Theory
We present the hyper-elliptic curve describing the moduli space of the N=2
supersymmetric Yang-Mills theory with the gauge group. The exact
monodromies and the dyon spectrum of the theory are determined. It is verified
that the recently proposed solitonic equation is also satisfied by our
solution.Comment: Complete set of monodromies are included. To be published in
Phys.lett.
Stability of flux vacua in the presence of charged black holes
In this letter we consider a charged black hole in a flux compactification of
type IIB string theory. Both the black hole and the fluxes will induce
potentials for the complex structure moduli. We choose the compact dimensions
to be described locally by a deformed conifold, creating a large hierarchy. We
demonstrate that the presence of a black hole typically will not change the
minimum of the moduli potential in a substantial way. However, we also point
out a couple of possible loop-holes, which in some cases could lead to
interesting physical consequences such as changes in the hierarchy.Comment: 14 pages. Published versio
Three-Flavor Partially Quenched Chiral Perturbation Theory at NNLO for Meson Masses and Decay Constants
We discuss Partially Quenched Chiral Perturbation Theory (PQPT) and
possible fitting strategies to Lattice QCD data at next-to-next-to-leading
order (NNLO) in the mesonic sector. We also present a complete calculation of
the masses of the charged pseudoscalar mesons, in the supersymmetric
formulation of PQPT. Explicit analytical results are given for up to
three nondegenerate sea quark flavors, along with the previously unpublished
expression for the pseudoscalar meson decay constant for three nondegenerate
sea quark flavors. The numerical analysis in this paper demonstrates that the
corrections at NNLO are sizable, as expected from earlier work.Comment: 31 pages, numerical discussion extended including convergence NLO to
NNL
The Pseudoscalar Meson Mass to Two Loops in Three-Flavor Partially Quenched PT
This paper presents a first study of the pseudoscalar meson masses to two
loops, or NNLO, within the supersymmetric formulation of partially quenched
chiral perturbation theory (PQPT). The expression for the pseudoscalar
meson mass in the case of three valence and three sea quarks with equal masses,
but different from each other, is given to , along with a
numerical analysis.Comment: 4 pages, one reference added, small changes in discussio
Holographic Superconductors with Lifshitz Scaling
Black holes in asymptotically Lifshitz spacetime provide a window onto finite
temperature effects in strongly coupled Lifshitz models. We add a Maxwell gauge
field and charged matter to a recently proposed gravity dual of 2+1 dimensional
Lifshitz theory. This gives rise to charged black holes with scalar hair, which
correspond to the superconducting phase of holographic superconductors with z >
1 Lifshitz scaling. Along the way we analyze the global geometry of static,
asymptotically Lifshitz black holes at arbitrary critical exponent z > 1. In
all known exact solutions there is a null curvature singularity in the black
hole region, and, by a general argument, the same applies to generic Lifshitz
black holes.Comment: 23 pages, 4 figures; v2: added references; v3: matches published
versio
NFV service dynamicity with a DevOps approach : demonstrating zero-touch deployment & operations
Next generation network services will be realized by NFV-based microservices to enable greater dynamics in deployment and operations. Here, we present a demonstrator that realizes this concept using the NFV platform built in the EU FP7 project UNIFY. Using the example of an Elastic Router service, we show automated deployment and configuration of service components as well as corresponding monitoring components facilitating automated scaling of the entire service. We also demonstrate automatic execution of troubleshooting and debugging actions. Operations of the service are inspired by DevOps principles, enabling quick detection of operational conditions and fast corrective actions. This demo conveys essential insights on how the life-cycle of an NFV-based network service may be realized in future NFV platforms
The Power-law Tail Exponent of Income Distributions
In this paper we tackle the problem of estimating the power-law tail exponent
of income distributions by using the Hill's estimator. A subsample
semi-parametric bootstrap procedure minimising the mean squared error is used
to choose the power-law cutoff value optimally. This technique is applied to
personal income data for Australia and Italy.Comment: Latex2e v1.6; 8 pages with 3 figures; in press (Physica A
On the consistency of de Sitter vacua
In this paper the consistency of the de Sitter invariant -vacua,
which have been introduced as simple tools to study the effects of
transplanckian physics, is investigated. In particular possible non
renormalization problems are discussed, as well as non standard properties of
Greens functions. We also discuss the non thermal properties of the -vacua and the necessity of to change. The conclusion is that non of
these problems necessarily exclude an application of the -vacua to
inflation.Comment: 12 pages, v2: minor clarifications and corrections to reference
Islands in the landscape
The string theory landscape consists of many metastable de Sitter vacua,
populated by eternal inflation. Tunneling between these vacua gives rise to a
dynamical system, which asymptotically settles down to an equilibrium state. We
investigate the effects of sinks to anti-de Sitter space, and show how their
existence can change probabilities in the landscape. Sinks can disturb the
thermal occupation numbers that would otherwise exist in the landscape and may
cause regions that were previously in thermal contact to be divided into
separate, thermally isolated islands.Comment: 31 pages, 8 figure
Quantum steering ellipsoids, extremal physical states and monogamy
A Corrigendum for this article has been published in 2015 New J. Phys. 17 019501Any two-qubit state can be faithfully represented by a steering ellipsoid inside the Bloch sphere, but not every ellipsoid inside the Bloch sphere corresponds to a two-qubit state. We give necessary and sufficient conditions for when the geometric data describe a physical state and investigate maximal volume ellipsoids lying on the physical-unphysical boundary. We derive monogamy relations for steering that are strictly stronger than the Coffman-Kundu- Wootters (CKW) inequality for monogamy of concurrence. The CKW result is thus found to follow from the simple perspective of steering ellipsoid geometry. Remarkably, we can also use steering ellipsoids to derive non-trivial results in classical Euclidean geometry, extending Eulers inequality for the circumradius and inradius of a triangle.The EPSRC and the ARC Centre of Excellence grant no. CE110001027. DJ is funded by the Royal
Society. TR would like to thank the Leverhulme Trust. SJ acknowledges EPSRC grant EP/
K022512/1
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