Showing papers in "Physics Letters B in 2005"

TL;DR: In this paper, a new scenario of dark energy dubbed quintom was proposed, which gives rise to the equation of state larger than -1 in the past and less than −1 today, satisfying current observations.

TL;DR: In this article, a modified Gauss-Bonnet (GB) term is added to the Einstein action as gravitational dark energy to describe the transition from deceleration to acceleration, crossing the phantom divide, current acceleration with effective (cosmological constant, quintessence or phantom) equation of the universe.

TL;DR: In this article, it was shown that the extension of the standard model by three right-handed neutrinos with masses smaller than the electroweak scale (the νMSM) can explain simultaneously dark matter and baryon asymmetry of the universe and be consistent with the experiments on neutrino oscillations.

TL;DR: In this paper, the cosmological evolution of a dark energy model with two scalar fields where one of the scalars has canonical kinetic energy and another scalar has negative kinetic energy term is investigated.

TL;DR: In this article, an extension of the Minimal Standard Model by right-handed neutrinos (the νMSM) was proposed to incorporate neutrino masses consistent with oscillation experiments.

TL;DR: In this paper, a model of holographic dark energy with an interaction with matter fields has been investigated, and it has been shown that the ratio of energy densities can vary with time.

TL;DR: In this paper, it was shown that any interaction of pressureless dark matter with holographic dark energy, whose infrared cutoff is set by the Hubble scale, implies a constant ratio of the energy densities of both components thus solving the coincidence problem.

TL;DR: In this article, the primordial abundance of late-decaying particles with hadronic branching ratio was derived for the non-thermal production process of D, 3 He and 6 Li.

TL;DR: In this article, the authors report the complete GNO solar neutrino results for the measuring periods GNO, III, GNO II, and GNO I. The GNO experiment is now terminated after altogether 58 solar exposure runs that were performed between 20 May 1998 and 9 April 2003.

TL;DR: In this paper, the authors derived the complete threshold-enhanced third-order (N 3 LO) QCD corrections to the total cross sections for the production of lepton pairs and the Higgs boson in hadron collisions.

TL;DR: The New Minimal Standard Model (NMMS) as discussed by the authors is a model that incorporates the new discoveries of physics beyond the minimal standard model (MSM): Dark Energy, non-baryonic Dark Matter, neutrino masses, as well as baryon asymmetry and cosmic inflation.

TL;DR: In this paper, it was shown that a family of local toric Kahler-Einstein metrics can be obtained by taking a certain scaling limit of a Euclideanised form of the Plebanski-Demianski metrics.

TL;DR: In this article, the existence of simple, realistic N=1 supersymmetric vacua that are compatible with low energy particle physics was shown, and the construction exploits a mechanism for splitting multiplets.

TL;DR: In this paper, a simple coordinate system of Kerr-Newman space-time is introduced, which has several attractive properties: the time direction is a Killing vector, the metric is smooth at the horizons, constant-time slices are just flat Euclidean space in radial and satisfy Landau's condition of clock synchronization.

TL;DR: In this article, a signal for the doubly charmed baryon Ξ c c + → p D + K − π + in the decay mode was observed in data from SELEX, the charm hadroproduction experiment at Fermilab.

TL;DR: In this paper, the authors presented a new value for the neutron lifetime of 878.5 ± 0.7stat. This result differs from the world average value by 6.5 standard deviations and by 5.6 standard deviations from the previous most precise result.

TL;DR: In this article, a coupled quintessence scenario was proposed to solve the problem of cosmic coincidence by introducing a coupling between the two dark sectors, and it was shown that the evolving trajectory of this scenario in the s-r diagram is quite different from those of other dark energy models.

TL;DR: In this article, the infrared finite absolute ratio of the time-like and space-like gluon form factors up to the fourth order in the strong coupling constant was derived.

TL;DR: In this article, the authors used chiral perturbation theory to study finite-volume effects with twisted boundary conditions for quantities without final state interactions, such as meson masses, decay constants and semileptonic form factors, and confirm that they remain exponentially small with the volume.

TL;DR: In this paper, the authors explicitly compute the two-point correlation function of the boundary stress energy tensor in a large class of type IIB supergravity backgrounds with a regular translationally invariant horizon.

TL;DR: In this article, it was shown that sneutrinos can play the role of dark matter in a previously studied variant of the MSSM in which the light neutrino masses result from higher-dimensional supersymmetry-breaking terms.

TL;DR: In this paper, the authors compute the two-loop corrections to the massless quark form factor γ ∗ → q q ¯ and gluon form factor H → g g to all orders in the dimensional regularization parameter e = ( 4 − d ) / 2.

TL;DR: In this article, it was shown that the effective EOS associated to a renormalization group (RG) model can correspond to both normal quintessence and phantom dark energy, depending on the value of a single parameter of the RG model.

TL;DR: In this paper, the authors re-analyze charged lepton corrections to neutrino mixing angles and CP phases, carefully including CP phases from the charged leptonic sector.

TL;DR: In this paper, a weakly model-dependent analysis is performed in terms of the modification factor of the dip, bump and Greisen-Zatsepin-Kuzmin (GZK) cutoff.

TL;DR: In this article, the authors studied the evolution of the dark energy universe by taking into account the higher-order string corrections to the Einstein-Hilbert action with fixed dilaton and modulus fields.

TL;DR: In this paper, it was shown that the string result required artificial regularization by zeta-function and that this matching is indeed correct up to fourth order in effective coupling; beyond, new contributions at odd powers.

TL;DR: In this article, a reasonable quantitative agreement between predictions of the cosmic microwave background radiation at small l and the WMAP observations was reached, showing the power of the holographic idea.

TL;DR: In this paper, the authors measured the cross section σ ( e + e − → π + π − γ ) at an energy W = m ϕ = 102 ÂGeV with the KLOE detector at the electron-positron collider.

TL;DR: In this article, the authors present a solution to this problem that does not require an extension of the MSSM at the weak scale, and obtain rather sharp predictions on the spectrum.