Physical sciences topic list of research papers
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Implications of graviton–graviton interaction to dark matter
Abstract Our present understanding of the universe requires the existence of dark matter and dark energy. We describe here a natural mechanism that could make exotic dark matter and possibly dark energy unnecessary. Graviton–graviton interactions...
2009 / A. Deur -
Effects of ion and electron correlations on neutrino scattering in the infall phase of a supernova
Abstract Many authors have used one-component plasma simulations in discussing the role of ion–ion correlations in reducing neutrino opacities during the collapse phase of a supernova. In a multicomponent plasma in which constituent ions have even a ...
2005 / R.F. Sawyer -
Singlet deformation and non(anti)commutative N=2 supersymmetric U(1) gauge theory
Abstract We study N=2 supersymmetric U(1) gauge theory in non(anti)commutative N=2 harmonic superspace with the singlet deformation, which preserves chirality. We construct a Lagrangian which is...
2004 / Takeo Araki, Katsushi Ito -
Loop corrections in higher dimensions via deconstruction
Abstract We calculate the one-loop corrections to the Kaluza–Klein gauge boson excitations in the deconstructed version of the 5D QED. Deconstruction provides a renormalizable UV completion of the 5D theory that enables to control the cut-off...
2003 / Adam Falkowski, Christophe Grojean, Stefan Pokorski -
Brane worlds in 5D and warped compactifications in IIB
Abstract In computing potentials for moduli in, for instance, type IIB string theory in the presence of fluxes and branes a factorisable ansatz for the ten-dimensional metric is usually made. We investigate the validity of this ansatz by examining...
2004 / S.P. de Alwis -
Schwinger model and string percolation in hadron–hadron and heavy ion collisions
Abstract In the framework of the Schwinger model for percolating strings we establish a general relation between multiplicity and transverse momentum square distributions in hadron–hadron and heavy ion collisions. Some of our results agree with the...
2004 / J. Dias de Deus, E.G. Ferreiro, C. Pajares, R. Ugoccioni -
Trimaximal lepton mixing with a trivial Dirac phase
Abstract We present a model which employs the seesaw mechanism with five right-handed neutrinos, leading to trimaximal and CP-conserving lepton mixing. Tri-bimaximal mixing is a natural limiting case of our model which occurs when one particular...
2010 / W. Grimus, L. Lavoura, A. Singraber -
Stopping and isospin equilibration in heavy ion collisions
Abstract We investigate the density behavior of the symmetry energy with respect to isospin equilibration in the combined systems Ru ( Zr ) ...
2004 / T. Gaitanos, M. Colonna, M. Di Toro, H.H. Wolter -
Supersymmetric coloured/hairy black holes
Abstract We discuss all possible spherically symmetric black hole type solutions to an N = 2 supergravity model with SO ...
2008 / Patrick Meessen -
Beyond twisted tori
Abstract Exploiting the fact that Kaluza–Klein monopoles and the associated generalized orbifold planes are sources for geometrical fluxes, ω, we show that the standard constraint ω ω ...
2007 / Giovanni Villadoro, Fabio Zwirner -
Computation of the string tension in four-dimensional Yang–Mills theory using large N reduction
Abstract Continuum reduction and Monte Carlo simulation are used to calculate the heavy quark potential and the string tension in large N Yang–Mills theory in four dimensions. The potential is calculated out to a separation of nine lattice units on...
2009 / Joe Kiskis, Rajamani Narayanan -
Lie-algebra expansions, Chern–Simons theories and the Einstein–Hilbert Lagrangian
Abstract Starting from gravity as a Chern–Simons action for the AdS algebra in five dimensions, it is possible to modify the theory through an expansion of the Lie algebra that leads to a system consisting of the Einstein–Hilbert action plus...
2006 / José D. Edelstein, Mokhtar Hassaïne, Ricardo Troncoso, Jorge Zanelli -
Democratic neutrino mixing reexamined
Abstract We reexamine the democratic neutrino mixing ansatz, in which the mass matrices of charged leptons and Majorana neutrinos arise, respectively, from the explicit breaking of S ...
2004 / Harald Fritzsch, Zhi-Zhong Xing -
The probable fate of the Standard Model
Abstract Extrapolating the Standard Model to high scales using the renormalisation group, three possibilities arise, depending on the mass of the Higgs boson: if the Higgs mass is large enough the Higgs self-coupling may blow up, entailing some new...
2009 / J. Ellis, J.R. Espinosa, G.F. Giudice, A. Hoecker, A. Riotto -
Kaonic nitrogen X-ray transition yields in a gaseous target
Abstract The first measurement of the yields of three kaonic nitrogen X-ray transitions, using the DEAR (DAΦNE Exotic Atom Research) setup at the DAΦNE collider of Frascati, is reported. The yields are 41.5±8.7(stat.)±4.1(sys.)% for the n=7→6...
2004 / T Ishiwatari, G Beer, A.M Bragadireanu, M Cargnelli, C Curceanu (Petrascu), et al. -
Majorana neutrinos and lepton-number-violating signals in top-quark and W-boson rare decays
Abstract We discuss rare lepton-number-violating top-quark and W-boson four-body decays to final states containing a same-charge lepton pair, of the same or of different flavors: t → ...
2006 / Shaouly Bar-Shalom, Nilendra G. Deshpande, Gad Eilam, Jing Jiang, Amarjit Soni -
R-violating decay of Wino dark matter and electron/positron excesses in the PAMELA/Fermi experiments
Abstract We show that R-parity violating decay of Wino dark matter of mass about 3 TeV can naturally account for the flux and spectral shape of the cosmic-ray electrons and positrons observed by the PAMELA and Fermi satellites. To provide a...
2009 / Satoshi Shirai, Fuminobu Takahashi, T.T. Yanagida -
Bound diquarks and their Bose–Einstein condensation in strongly coupled quark matter
Abstract We explore the formation of diquark bound states and their Bose–Einstein condensation (BEC) in the phase diagram of three-flavor quark matter at nonzero temperature, T, and quark chemical potential, μ. Using a quark model with a...
2008 / Masakiyo Kitazawa, Dirk H. Rischke, Igor A. Shovkovy -
M(B∗c)–M(Bc) splitting from nonrelativistic renormalization group
Abstract We compute the hyperfine splitting in a heavy quarkonium composed of different flavors in next-to-leading logarithmic approximation using the nonrelativistic renormalization group. We predict the mass difference of the vector and...
2004 / A.A. Penin, A. Pineda, V.A. Smirnov, M. Steinhauser -
High resolution measurement of the 208Pb(p,γ) capture reaction up to Eγ=19 MeV
Abstract High-energy γ rays produced by the 208Pb(p,γ) reaction were measured with the AFRODITE germanium detector array. The use of Ge instead of NaI detectors improved the energy resolution by more than a factor of 10 in the γ-ray energy range...
2004 / M Lipoglavšek, R.A Bark, M Benatar, E Gueorguieva, J Kau, et al.