Journal of High Energy Physics

http://link.springer.com/journal/13130

List of Papers (Total 9,368)

More on the connection between planar field theory and string theory

We continue work on the connection between world sheet representation of the planar ϕ 3 field theory and string formation. The present article, like the earlier work, is based on the existence of a solitonic solution on the world sheet, and on the zero mode fluctuations around this solution. The main advance made in this paper is the removal of the cutoff and the transition to the ...

On the relation between hybrid and pure spinor string theory

In this paper we revisit Berkovits’ pure spinor formalism in lower dimensions. We are particularly interested in relating a six-dimensional pure spinor action previously constructed in the literature to other superstring formalisms. In order to gain some insight into six-dimensional pure spinors, we first derive their action by gauge-fixing the classical six-dimensional ...

On the transverse momentum in Z-boson production in a virtuality ordered parton shower

Cross sections for physical processes that involve very different momentum scales in the same process will involve large logarithms of the ratio of the momentum scales when calculated in perturbation theory. One goal of calculations using parton showers is to sum these large logarithms. We ask whether this goal is achieved for the transverse momentum distribution of a Z-boson ...

On-shell recursion relations for generic theories

We show that on-shell recursion relations hold for tree amplitudes in generic two derivative theories in an arbitrary number of dimensions with multiple particle species and diverse spins. For example, in a gauge theory coupled to scalars and fermions, any amplitude with at least one gluon obeys a recursion relation. In (super)gravity coupled to scalars and fermions, the same holds ...

Charged magnetic brane solutions in AdS5 and the fate of the third law of thermodynamics

We construct asymptotically AdS5 solutions to 5-dimensional Einstein-Maxwell theory with Chern-Simons term which are dual to 4-dimensional gauge theories, including \(\mathcal{N} = 4 \) SYM theory, in the presence of a constant background magnetic field B and a uniform electric charge density ρ. For the solutions corresponding to supersymmetric gauge theories, we find numerically ...

AdS7/CFT6, Gauss-Bonnet gravity, and viscosity bound

We study the relation between the causality and positivity of energy bounds for Gauss-Bonnet gravity in an AdS 7 background. Requiring the group velocity of metastable states to be bounded by the speed of light places a bound on the value of Gauss-Bonnet coupling. To find the positivity of energy constraints we compute the parameters which determine the angular distribution of the ...

Freeze-in production of FIMP dark matter

We propose an alternate, calculable mechanism of dark matter genesis, “thermal freeze-in”, involving a Feebly Interacting Massive Particle (FIMP) interacting so feebly with the thermal bath that it never attains thermal equilibrium. As with the conventional “thermal freeze-out” production mechanism, the relic abundance reflects a combination of initial thermal distributions ...

A finely-predicted Higgs boson mass from a finely-tuned weak scale

If supersymmetry is broken directly to the Standard Model at energies not very far from the unified scale, the Higgs boson mass lies in the range (128–141) GeV. The end points of this range are tightly determined. Theories with the Higgs boson dominantly in a single supermultiplet predict a mass at the upper edge, (141 ± 2) GeV, with the uncertainty dominated by the experimental ...

Towards a holographic model of color-flavor locking phase

We demonstrate a holographic realization of color-flavor locking phase, using \( \mathcal{N} \) = 4 SU(N c ) SYM coupled to \( \mathcal{N} \) = 2 N f fundamental hypermultiplets as an example. The gravity dual consists of N c D3-branes and N f D7-branes with world volume gauge field representing the baryon density. Treating a small number Ñ c \( \subset \) N c of D3-branes as ...

A dark matter candidate from Lorentz invariance in 6D

We study the unique 6 dimensional orbifold with chiral fermions where a stable dark matter candidate is present due to Lorentz invariance on the orbifold, with no additional discrete symmetries imposed by hand. We propose a model of Universal Extra Dimensions where a scalar photon of few hundred GeV is a good candidate for dark matter. The spectrum of the model is characteristic of ...

Observations on arithmetic invariants and U-duality orbits in \( \mathcal {N} \) = 8 supergravity

We establish a relation between time-like, light-like and space-like orbits of the non-compact E 7(7)(\(\mathbb{R} \)) symmetry and discrete E 7(7)(\(\mathbb{Z} \)) invariants. We discuss the Uduality invariant formula for the degeneracy of states \( d (\mathcal{Q}) \) which in the approximation of large occupation numbers reproduces the Bekenstein-Hawking entropy formula for ...

Goldstini

Supersymmetric phenomenology has been largely bound to the hypothesis that supersymmetry breaking originates from a single source. In this paper, we relax this underlying assumption and consider a multiplicity of sectors which independently break supersymmetry, thus yielding a corresponding multiplicity of goldstini. While one linear combination of goldstini is eaten via the ...

Open worldsheets for holographic interfaces

Type IIB supergravity admits Janus and multi-Janus solutions with eight unbroken supersymmetries that are locally asymptotic to AdS 3 × S 3 × M 4 (where M 4 is either T 4 or K 3). These solutions are dual to two or more CFTs defined on half-planes which share a common line interface. Their geometry consists of an AdS 2 × S 2 × M 4 fibration over a simply connected Riemann surface Σ ...

Effective potential and warp factor dynamics

We define an effective potential describing all massless and massive modes in the supergravity limit of string/M theory compactification which is valid off-shell, i.e. without imposing the equations of motion. If we neglect the warp factor, it is unbounded below, as is the case for the action in Euclidean quantum gravity. By study of the constraint which determines the warp factor, ...

Interpreting multiple dualities conjectured from superconformal index identities

We consider field theory side of new multiple Seiberg dualities conjectured within superconformal index matching approach. We study the case of SU(2) supersymmetric QCD and find that the numerous conjectured duals are different faces of handful of master theories. These different faces are inequivalent to each other in a very peculiar sense. Some master theories are fully known; we ...

Integrability and the AdS 3/CFT 2 correspondence

We investigate the AdS 3/CFT 2 correspondence for theories with 16 supercharges using the integrability approach. We construct Green-Schwarz actions for Type IIB strings on AdS 3 × S 3× M 4 where M 4 = T 4 or S 3 × S 1 using the coset approach. These actions are based on a \( {\mathbb{Z}_4} \) automorphism of the super-coset D(2, 1; α) × D(2, 1; α)/SO(1, 2) × SO(3)×SO(3). The ...

Dileptonic signatures of T-odd quarks at the LHC

Little Higgs models are often endowed with a T-parity in order to satisfy electroweak precision tests and give at the same time a stable particle which is a candidate for cold dark matter. This type of models predicts a set of new T-odd fermions in addition to the heavy gauge bosons of the Little Higgs models, which may show interesting signatures at colliders. In this paper, we ...

The Grassmannian origin of dual superconformal invariance

A dual formulation of the S Matrix for \( \mathcal {N} \) = 4 SYM has recently been presented, where all leading singularities of n-particle Nk−2MHV amplitudes are given as an integral over the Grassmannian G(k, n), with cyclic symmetry, parity and superconformal invariance manifest. In this short note we show that the dual superconformal invariance of this object is also manifest. ...

Supergravity solutions from floating branes

We simplify the equations of motion of five-dimensional ungauged supergravity coupled to three U(1) gauge fields using a floating-brane Ansatz in which the electric potentials are directly related to the gravitational warp factors. We find a new class of non-BPS solutions, that can be obtained linearly starting from an Euclidean four-dimensional Einstein-Maxwell base. This class – ...

Events with an isolated lepton and missing transverse momentum and measurement of W production at HERA

A search for events containing an isolated electron or muon and missing transverse momentum produced in e ± p collisions is performed with the H1 and ZEUS detectors at HERA. The data were taken in the period 1994–2007 and correspond to an integrated luminosity of 0.98 fb−1. The observed event yields are in good overall agreement with the Standard Model prediction, which is ...

A bound on the superpotential

We prove a general bound on the superpotential in theories with broken supersymmetry and broken R-symmetry, |〈W〉| < \( \frac{1}{2} \) f a F, where f a and F are the R-axion and Goldstino decay constants, respectively. The bound holds for weakly coupled as well as strongly coupled theories, thereby providing an exact result in theories with broken supersymmetry. We briefly discuss ...

The temperature and entropy of CFT on time-dependent backgrounds

We express the AdS-Schwarzschild black-hole configuration in coordinates such that the boundary metric is of the FLRW type. We review how this construction can be used in order to calculate the stress-energy tensor of the dual CFT on the FLRW background. We deduce the temperature and entropy of the CFT, which are related to the temperature and entropy of the black hole. We find ...

Matrix models for the black hole information paradox

We study various matrix models with a charge-charge interaction as toy models of the gauge dual of the AdS black hole. These models show a continuous spectrum and power-law decay of correlators at late time and infinite N, implying information loss in this limit. At finite N, the spectrum is discrete and correlators have recurrences, so there is no information loss. We study these ...

Gravity with de Sitter and unitary tangent groups

Einstein Gravity can be formulated as a gauge theory with the tangent space respecting the Lorentz symmetry. In this paper we show that the dimension of the tangent space can be larger than the dimension of the manifold and by requiring the invariance of the theory with respect to 5d Lorentz group (de Sitter group) Einstein theory is reproduced unambiguously. The other possibility ...

No chiral truncation of quantum log gravity?

At the classical level, chiral gravity may be constructed as a consistent truncation of a larger theory called log gravity by requiring that left-moving charges vanish. In turn, log gravity is the limit of topologically massive gravity (TMG) at a special value of the coupling (the chiral point). We study the situation at the level of linearized quantum fields, focussing on a ...