Physical sciences topic list of research papers
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Minimal supergravity, inflation, and all that
Abstract We consider an inflationary model in the hidden-sector broken supergravity with an effectively large cutoff. The inflaton decay into right-handed neutrinos naturally causes the observed baryon asymmetry of the universe with a reheating...
2006 / M. Ibe, K.-I. Izawa, Y. Shinbara, T.T. Yanagida -
Logarithm of the scale factor as a generalised coordinate in a Lagrangian for dark matter and dark energy
Abstract A Lagrangian for the k-essence field is set up with canonical kinetic terms and incorporating the scaling relation of [R.J. Scherrer, Phys. Rev. Lett. 93 (2004) 011301]. There are two degrees of freedom, viz., q ...
2008 / Debashis Gangopadhyay, Somnath Mukherjee -
Probing leptonic CP phases in LFV processes
Abstract We study a CP and T violating triple (spin) correlation in the muon to electron conversion in nuclei in the context of the seesaw mechanism. After concluding that the results are negative for all three seesaw types, we turn to the...
2010 / Borut Bajc, Miha Nemevšek, Goran Senjanović -
Metastable supersymmetry breaking without scales
Abstract We construct new examples of models of metastable D = 4 N = ...
2011 / Felix Brümmer -
Unparticle physics and Higgs phenomenology
Abstract Recently, conceptually new physics beyond the Standard Model has been proposed, where a hidden conformal sector provides “unparticle” which couples to the Standard Model sector through higher dimensional operators in low energy effective...
2008 / Tatsuru Kikuchi, Nobuchika Okada -
Fragment formation in proton induced reactions within a BUU transport model
Abstract The formation of fragments in proton-induced reactions at low relativistic energies within a combination of a covariant dynamical transport model and a statistical approach is investigated. In particular, we discuss in detail the...
2008 / T. Gaitanos, H. Lenske, U. Mosel -
Repulsive Casimir force from fractional Neumann boundary conditions
Abstract This Letter studies the finite temperature Casimir force acting on a rectangular piston associated with a massless fractional Klein–Gordon field at finite temperature. Dirichlet boundary conditions are imposed on the walls of a...
2009 / S.C. Lim, L.P. Teo -
Observational constraints on phantom power-law cosmology
Abstract We investigate phantom cosmology in which the scale factor is a power law, and we use cosmological observations from Cosmic Microwave Background (CMB), Baryon Acoustic Oscillations (BAO) and observational Hubble data, in order to impose...
2010 / Chakkrit Kaeonikhom, Burin Gumjudpai, Emmanuel N. Saridakis -
Cosmological constant from gauge fields on extra dimensions
Abstract We present a new model of dark energy which could explain the observed accelerated expansion of our Universe. We show that a five-dimensional Einstein–Yang–Mills theory defined in a flat Friedmann–Robertson–Walker universe compactified on a ...
2006 / Hing-Tong Cho, Choon-Lin Ho, Kin-Wang Ng -
A new approach to quintessence and a solution of multiple attractors
Abstract We take a new approach to construct quintessential models. With this approach, we first easily obtain a tracker solution that is different from those discovered before and straightforwardly find a solution of multiple attractors, i.e., a...
2008 / Shuang-Yong Zhou -
Flavor violation in warped extra dimensions and CP asymmetries in B decays
Abstract We show that CP asymmetries in b→s hadronic decays are potentially affected by the presence of massive color–octet particles strongly coupled to the third generation quarks. Theories with warped extra dimensions provide natural candidates...
2004 / Gustavo Burdman -
Duality symmetry of string theory: A worldsheet perspective
Abstract We study duality and local symmetries of closed bosonic string from the perspectives of worldsheet approach in the phase space path integral formalism. It is shown that the Ward identities reflecting the local symmetries associated with...
2010 / Jnanadeva Maharana -
Observations on dA scattering at forward rapidities
Abstract We point out that the suppression in the ratio R dAu recently observed by the BRAHMS Collaboration in forward...
2004 / V. Guzey, M. Strikman, W. Vogelsang -
Jet lag effect and leading hadron production
Abstract We propose a solution for the long standing puzzle of a too steeply falling fragmentation function for a quark fragmenting into a pion, calculated by Berger [E.L. Berger, Phys. Lett. B 89 (1980) 241] in the Born approximation. Contrary to...
2008 / B.Z. Kopeliovich, H.-J. Pirner, I.K. Potashnikova, Ivan Schmidt -
Spontaneous Lorentz violation: Non-Abelian gauge fields as pseudo-Goldstone vector bosons
Abstract We argue that non-Abelian gauge fields can be treated as the pseudo-Goldstone vector bosons caused by spontaneous Lorentz invariance violation (SLIV). To this end, the SLIV which evolves in a general Yang–Mills type theory with the...
2007 / J.L. Chkareuli, J.G. Jejelava -
Decaying gravitino dark matter and an upper bound on the gluino mass
Abstract We show that, if decaying gravitino dark matter is responsible for the PAMELA and ATIC/PPB-BETS anomalies in the cosmic-ray electron and positron fluxes, both reheating temperature and the gluino mass are constrained from above. In...
2009 / Koichi Hamaguchi, Fuminobu Takahashi, T.T. Yanagida -
The generalized Gerasimov–Drell–Hearn sum rule for deuteron electrodisintegration
Abstract The generalized Gerasimov–Drell–Hearn sum rule I GDH γ∗d(Q2) for deuteron electrodisintegration d(e,e′)np as function of the squared four-momentum transfer Q ...
2004 / Hartmuth Arenhövel -
Brane tachyon dynamics
Abstract The dynamics of a tachyon attached to a Dvali, Gabadadze and Porrati (DGP) brane is investigated. Exponential potential and inverse power law potential are explored, respectively. The quasi-attractor behavior, for which the universe will...
2010 / Hongsheng Zhang, Xin-Zhou Li, Hyerim Noh -
The role of photon polarization modes in the magnetization and instability of the vacuum in a supercritical field
Abstract The response of the QED vacuum in an asymptotically large electromagnetic field is studied. In this regime the vacuum energy is strongly influenced by the vacuum polarization effect. The possible interaction between the virtual...
2010 / Selym Villalba-Chávez -
CFT adapted gauge invariant formulation of massive arbitrary spin fields in AdS
Abstract Using Poincaré parametrization of AdS space, we study massive totally symmetric arbitrary spin fields in AdS space of dimension greater than or equal to four. CFT adapted gauge invariant formulation for such fields is developed. Gauge...
2009 / R.R. Metsaev