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Showing papers in "Physics Letters B in 2007"


Journal ArticleDOI
TL;DR: In this article, the authors consider examples of hidden-valley models, where a new confining gauge group is added to the standard model, and find LHC production cross-sections typically in the 1-100 fb range, though they can be larger.

781 citations


Journal ArticleDOI
TL;DR: In this article, the age of the universe is introduced as the length measure and a dark energy model is proposed based on the energy density of quantum fluctuations of space-time, which is consistent with astronomical data if the unique numerical parameter is taken to be a number of order one.

585 citations


Journal ArticleDOI
TL;DR: In this article, the Friedmann equation for modified gravity models is calculated, and it is shown that these models must mimic general relativity plus Λ throughout the cosmic history, with exponentially suppressed corrections.

540 citations


Journal ArticleDOI
TL;DR: In this article, two realistic f(R) and one F(G) modified gravities are proposed, which are consistent with local tests and cosmological bounds, and the typical property of such theories is that early-time inflation and late-time cosmic acceleration are naturally unified within a single model.

520 citations


Journal ArticleDOI
TL;DR: In this article, it was shown that the thermal relic abundance of the dark matter is strongly altered by a non-perturbative effect called the Sommerfeld enhancement, when constituent particles are non-singlet under the SU(2)L gauge interaction and much heavier than the weak gauge bosons.

451 citations


Journal ArticleDOI
TL;DR: In this article, the equivalence principle is violated in the case of the Abell cluster A586, which exhibits evidence of the interaction between dark matter and dark energy and argues that this interaction implies a violation.

400 citations


Journal ArticleDOI
Howard Georgi1
TL;DR: In this article, the peculiar propagator of scale invariant unparticles has phases that produce unusual patterns of interference with standard model processes, and they illustrate some of these effects in e + e − → μ + μ −.

393 citations


Journal ArticleDOI
TL;DR: In this paper, the authors explore a "fertile patch" of the heterotic landscape based on a 6-II orbifold with SO(10) and E6 local GUT structures.

391 citations


Journal ArticleDOI
TL;DR: In this paper, the authors re-examine the question of radiative symmetry breaking in the Standard Model in the presence of right-chiral neutrinos and a minimally enlarged scalar sector.

388 citations


Journal ArticleDOI
TL;DR: In this paper, a non-commutative geometry inspired solution of the coupled Einstein-Maxwell field equations describing a variety of charged, self-gravitating objects, including extremal and non-extremal black holes, was found.

333 citations


Journal ArticleDOI
TL;DR: In this article, a cosmological application of holographic dark energy density in the Brans-Dicke framework is studied, where the authors employ the holographic model of dark energy to obtain the equation of state for the hologram density in non-flat (closed) universe.

Journal ArticleDOI
M. Aguilar, J. Alcaraz, J.V. Allaby1, Behcet Alpat2  +211 moreInstitutions (27)
TL;DR: In this article, a measurement of the cosmic ray positron fraction in the energy range of 1 −30 GeV was presented, based on data taken by the AMS-01 experiment during its 10-day Space Shuttle flight in June 1998.

Journal ArticleDOI
TL;DR: In this article, it is shown that modified gravity becomes complex at the region where the original phantom dark energy theory develops a Big Rip singularity, and that even for even scalar potentials, the ensuing modified gravity real.

Journal ArticleDOI
TL;DR: Eling et al. as mentioned in this paper showed that the horizon thermodynamics is non-equilibrium one for the f ( R ) gravity, whose action is a function of the curvature scalar R.

Journal ArticleDOI
TL;DR: In this paper, a correspondence between the holographic dark energy density and Chaplygin gas energy density in FRW universe is considered. And the potential and the dynamics of the scalar field are reconstructed.

Journal ArticleDOI
TL;DR: In this article, a non-Abelian discrete group is constructed in which the tri-bi-maximal mixing directly follows from the vacuum structure enforced by the discrete symmetry.

Journal ArticleDOI
TL;DR: In this paper, the authors studied the thermally produced gravitino yield to leading order in the Standard Model gauge couplings and found a maximum reheating temperature of about 10 7 GeV taking into account bound-state effects on the primordial 6Li abundance.

Journal ArticleDOI
TL;DR: In this paper, a correspondence between the holographic dark energy density and interacting generalized Chaplygin gas energy density in FRW universe is considered. And the potential of the scalar field is reconstructed to describe the generalized Chapleygin cosmology.

Journal ArticleDOI
TL;DR: In this article, a string-motivated dark energy scenario featuring a scalar field coupled to the Gauss-Bonnet invariant is investigated, and the evolution of the universe in such a model, identifying its key properties.

Journal ArticleDOI
TL;DR: In this article, the anomalous magnetic moment of the muon and the value of the QED coupling at the Z-boson mass were updated, incorporating the new e^+e^- \to \pi\pi data obtained by CMD-2 and KLOE, as well as the corrected SND data.

Journal ArticleDOI
TL;DR: The ϕ 4 model on four-dimensional Moyal space with harmonic potential is asymptotically safe up to three loops, as shown by H. Grosse and R. Rivasseau as discussed by the authors.

Journal ArticleDOI
TL;DR: In this article, the authors developed a unitarity method to compute one-loop amplitudes with massless propagators in d = 4 − 2 ϵ dimensions, which yields results valid for arbitrary values of ϵ.

Journal ArticleDOI
TL;DR: In this paper, a model based on SU ( 5 ) × T ( d ) which successfully gives rise to near tri-bimaximal leptonic mixing as well as realistic CKM matrix elements for the quarks is presented.

Journal ArticleDOI
TL;DR: In this paper, the holographic dark energy model is described by a quintessence scalar field with dimensionless parameter c ≥ 1 and the potential and dynamics of the field are reconstructed.

Journal ArticleDOI
TL;DR: In this article, it is shown how the extra CP-odd phases of a general non-unitary matrix allow for sizeable CP-asymmetries in channels other than those dominant in the standard unitary case.

Journal ArticleDOI
V.Yu. Alexakhin1, Yu. Alexandrov2, G. D. Alexeev1, M.G. Alexeev3  +242 moreInstitutions (25)
TL;DR: In this paper, a measurement of the deuteron spin-dependent structure function g 1 d based on the data collected by the COMPASS experiment at CERN during the years 2002-2004 is presented.

Journal ArticleDOI
TL;DR: In this article, the effects of the generalized uncertainty principle (GUP) on black hole thermodynamics were investigated and a drastic reduction of the decay time was obtained in comparison with the results obtained in the Hawking semi classical picture and with the GUP to leading order in the Planck length.

Journal ArticleDOI
TL;DR: In this article, the authors show how the reduction of the underlying symmetry to a discrete subgroup of SO(3) or SU(3), rendering this alignment a generic property of such models, can be quite naturally accommodated in a complete unified theory of quark and lepton masses.

Journal ArticleDOI
TL;DR: In this article, a model of quark and lepton masses and mixings based on A4 family symmetry, a discrete subgroup of an SO(3) flavour symmetry, together with Pati-Salam unification is presented.

Journal ArticleDOI
TL;DR: In this paper, a new set of parton distributions obtained at NNLO were presented, including a full treatment of heavy flavors in the region near the quark mass, and the improved treatment leads to a significant change in the gluon and heavy quark distributions, and a larger value of the QCD coupling at N NLO, α S (M Z 2 ) = 0.1191 ± 0.002 ( expt. ) ± 0.003 ( theory ).