Physical sciences topic list of research papers
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Vacuum quantum effect for curved boundaries in static Robertson–Walker space–time
Abstract The energy–momentum tensor for a massless conformally coupled scalar field in the region between two curved boundaries in k = − 1 ...
2009 / M.R. Setare, J. Sadeghi -
The electric dipole form factor of the nucleon in chiral perturbation theory to sub-leading order
Abstract The electric dipole form factor (EDFF) of the nucleon stemming from the QCD θ ¯ term and from the quark...
2010 / E. Mereghetti, J. de Vries, W.H. Hockings, C.M. Maekawa, U. van Kolck -
Statistical entropy of two-dimensional dilaton de Sitter space
Abstract It has been proposed that a quantum group structure underlies de Sitter/conformal field theory duality. These ideas are used to give a microscopic operator counting interpretation for the entropy of two-dimensional dilaton de Sitter space....
2005 / David A. Lowe -
Supersymmetric threshold corrections to Δm2⊙
Abstract For nearly degenerate neutrinos, quantum corrections can modify the tree-level masses via low energy supersymmetric threshold corrections comparable to the solar oscillation mass scale. We numerically calculate corrections to neutrino...
2004 / Biswajoy Brahmachari, Eung Jin Chun -
A comment on discrete Kalb–Ramond field on orientifold and rank reduction
Abstract We show that the rank reduction of the gauge group on orientifolds in presence of non-vanishing discrete Kalb–Ramond field can be explained by the presence of an induced field strength in a non-trivial bundle on the branes. This field...
2008 / I. Pesando -
New quark relations for hadron masses and magnetic moments: A challenge for explanation from QCD
Abstract Prompted by the recent surprising results in QCD spectroscopy, we extend the treatment of the constituent quark model showing that mass differences and ratios have the same values when obtained from mesons and baryons. We obtain several new ...
2007 / Marek Karliner, Harry J. Lipkin -
Nearby resonances beyond the Breit–Wigner approximation
Abstract We consider a description of propagators for particle resonances which takes into account the quantum-mechanical interference due to the width of two or more nearby states that have common decay channels, by incorporating the effects...
2009 / Giacomo Cacciapaglia, Aldo Deandrea, Stefania De Curtis -
Search for spin-dependent macroscopic short-range interactions using neutron spin precession close to a mirror
Abstract Free neutrons can be employed as a sensitive probe to search for spin-dependent macroscopic short-range interactions induced by axion-like particles. In this Letter it is proposed to use pseudomagnetic precession of ultracold neutrons...
2010 / O. Zimmer -
Does the holographic principle determine the gravitational interaction?
Abstract It is likely that the holographic principle will be a consequence of the would be theory of quantum gravity. Thus, it is interesting to try to go in the opposite direction: can the holographic principle fix the gravitational interaction? It ...
2005 / F. Canfora, G. Vilasi -
Form factors and wave functions of vector mesons in holographic QCD
Abstract Within the framework of a holographic dual model of QCD, we develop a formalism for calculating form factors of vector mesons. We show that the holographic bound states can be described not only in terms of eigenfunctions of the equation of ...
2007 / Hovhannes R. Grigoryan, Anatoly V. Radyushkin -
Nuclear excitation by electron capture followed by fast x-ray emission
Abstract The resonance strength of the two-step process of nuclear excitation by electron capture followed by γ decay of the nucleus can be significantly increased in highly charged ions if the resonant capture proceeds via an excited electronic...
2008 / Adriana Pálffy, Zoltán Harman, Christophor Kozhuharov, Carsten Brandau, Christoph H. Keitel, et al. -
Transparency, mixing and reflection of initial flows in relativistic nuclear collisions
Abstract We propose to use the hadron number fluctuations in the limited momentum regions to study the evolution of initial flows in high energy nuclear collisions. In this method by a proper preparation of a collision sample the projectile and...
2006 / Marek Gaździcki, Mark Gorenstein -
Di-neutron elastic transfer in the 4He(6He,6He)4He reaction
Abstract Elastic 6He+4He data measured at E c.m.=11.6, 15.9, and 60.3 MeV have been analyzed within the coupled reaction channels (CRC) formalism, with the elastic-scattering and two-neutron (2n) transfer amplitudes coherently...
2004 / Dao T. Khoa, W. von Oertzen -
Holographic bounds and Higgs inflation
Abstract In a recently proposed scenario for primordial inflation, where the Standard Model (SM) Higgs boson plays a role of the inflation field, an effective field theory (EFT) approach is the most convenient for working out the consequences of...
2011 / R. Horvat -
The quark mixing matrix with manifest Cabibbo substructure and an angle of the unitarity triangle as one of its parameters
Abstract The quark mixing matrix is parameterised such that its “Cabibbo substructure” is emphasised. One can choose one of the parameters to be an arbitrarily chosen angle of the unitarity triangle, for example, the angle β (also called ...
2005 / C. Jarlskog -
Charming penguins in B→PP decays and the extraction of γ
Abstract It is shown that inclusion of charming penguins of the size suggested by short-distance dynamics may shift down by 10°–15° the value of γ extracted via the overall fit to the B→PP branching ratios. A substantial dependence of the fit on...
2004 / P. Żenczykowski -
Born–Infeld determinantal gravity and the taming of the conical singularity in 3-dimensional spacetime
Abstract In the context of Born–Infeld determinantal gravity formulated in an n-dimensional spacetime with absolute parallelism, we found an exact 3-dimensional vacuum circular symmetric solution without cosmological constant consisting in a...
2010 / Rafael Ferraro, Franco Fiorini -
VPγ radiative decay of resonances dynamically generated from the vector meson–vector meson interaction
Abstract We evaluate the radiative decay into a vector, a pseudoscalar and a photon of several resonances dynamically generated from the vector–vector interaction. The process proceeds via the decay of one of the vector components into a...
2010 / J. Yamagata-Sekihara, E. Oset -
Spectroscopy, leptonic decays and the nature of heavy quarkonia
Abstract We examine the electronic width ratios of ϒ resonances below the B B ¯ threshold by means ...
2008 / Juan-Luis Domenech-Garret, Miguel-Angel Sanchis-Lozano -
10D Euclidean dynamical triangulations
Abstract We investigate numerically 10-dimensional Euclidean quantum gravity (with discretized Einstein–Hilbert action) in the framework of the dynamical triangulation approach. For the considered values of the gravitational coupling we observed two ...
2004 / A.I. Veselov, M.A. Zubkov