Physical sciences topic list of research papers
-
The νMSM, dark matter and neutrino masses
Abstract We investigate an extension of the Minimal Standard Model by right-handed neutrinos (the νMSM) to incorporate neutrino masses consistent with oscillation experiments. Within this theory, the only candidates for dark matter particles are...
2005 / Takehiko Asaka, Steve Blanchet, Mikhail Shaposhnikov -
Finite size effects in stimulated laser pair production
Abstract We consider stimulated pair production employing strong-field QED in a high-intensity laser background. In an infinite plane wave, we show that light-cone quasi-momentum can only be transferred to the created pair as a multiple of the laser ...
2010 / Thomas Heinzl, Anton Ilderton, Mattias Marklund -
Time-dependent fluctuations and particle production in cosmological de Sitter and anti-de Sitter spaces
Abstract We study the evolution of time-dependent fluctuations and particle production in an expanding dS and contracting AdS universe. Using the functional Schrödinger formalism we are able to probe the time-dependent regime which is out of the...
2010 / Eric Greenwood, De Chang Dai, Dejan Stojkovic -
On the stability of field-theoretical regularizations of negative tension branes
Abstract Any attempt to regularize a negative tension brane through a bulk scalar requires that this field is a ghost. One can try to improve in this aspect in a number of ways. For instance, it has been suggested to employ a field whose kinetic...
2005 / N.J. Nunes, Marco Peloso -
Holographic dark energy: Quantum correlations against thermodynamical description
Abstract Classical and quantum entropic properties of holographic dark energy (HDE) are considered in view of the fact that its entropy is far more restrictive than the entropy of a black hole of the same size. In cosmological settings (in which HDE ...
2008 / R. Horvat -
Search for lepton flavor violation in the Higgs boson decay at a linear collider
Abstract We discuss possibility of direct search for lepton flavor violation (LFV) in Yukawa interaction by measuring the branching ratio for the decay of the lightest Higgs boson ( ...
2004 / Shinya Kanemura, Koichi Matsuda, Toshihiko Ota, Tetsuo Shindou, Eiichi Takasugi, et al. -
Spin structure of the pion from the instanton vacuum
Abstract We investigate the spin structure of the pion within the framework of the nonlocal chiral quark model from the instanton vacuum. We first evaluate the tensor form factors of the pion for the first and second moment ...
2011 / Seung-il Nam, Hyun-Chul Kim -
Noncompact Kaluza–Klein theory and inflationary cosmology: a complete formalism
Abstract A formalization of the recently introduced formalism for inflation is developed from a noncompact Kaluza–Klein theory. In particular, the case for a single scalar field inflationary model is studied. We obtain that the scalar potential,...
2004 / José Edgar Madriz Aguilar, Mauricio Bellini -
Canonical fermion determinants in lattice QCD – Numerical evaluation and properties
Abstract We analyze canonical fermion determinants, i.e., fermion determinants projected to a fixed quark number q. The canonical determinants are computed using a dimensional reduction formula and are studied for pure SU ...
2011 / Erek Bilgici, Julia Danzer, Christof Gattringer, C.B. Lang, Ludovit Liptak -
Exact solutions in bouncing cosmology
Abstract We discuss the effects of a (possibly) negative ( 1 + z ...
2007 / Tomasz Stachowiak, Marek Szydłowski -
Gravitational instantons and Euclidean supersymmetry
Abstract Supersymmetric instanton solutions in four-dimensional Euclidean ungauged Einstein–Maxwell theory are analysed and classified according to the fraction of supersymmetry they preserve, using spinorial geometry techniques. ...
2010 / J.B. Gutowski, W.A. Sabra -
Scalaron the mighty: Producing dark matter and baryon asymmetry at reheating
Abstract In R 2 -inflation scalaron slow roll is responsible for the inflationary stage, while its oscillations reheat the...
2011 / D.S. Gorbunov, A.G. Panin -
Cosmological model with energy transfer
Abstract The observations of SNIa suggest that we live in the acceleration epoch when the densities of the cosmological constant term and matter are almost equal. This leads to the cosmic coincidence conundrum. As the explanation for this problem we ...
2005 / Marek Szydłowski -
Are low-energy nuclear observables sensitive to high-energy phase shifts?
Abstract Conventional nucleon–nucleon potentials with strong short-range repulsion require contributions from high-momentum wave function components even for low-energy observables such as the deuteron binding energy. This can lead to the...
2007 / S.K. Bogner, R.J. Furnstahl, R.J. Perry, A. Schwenk -
Solutions of the renormalisation group equation in minimal supersymmetric Standard Model (MSSM)
Abstract Renormalisation group equation (RGE) for color and top couplings sector of MSSM has been solved. The mass of the top comes out to be 180.92 ± 10.87 ...
2005 / B.B. Deo, L. Maharana, P.K. Mishra -
Towards neutron drip line via transfer-type reactions
Abstract Possibilities of production of light neutron-rich isotopes 24,26O, 32Ne, 36,38Mg, 42Si and 56,58,60Ca in transfer-type reactions are analyzed. The optimal conditions for their production are suggested. The measurement of the excitation...
2005 / Yu.E. Penionzhkevich, G.G. Adamian, N.V. Antonenko -
Equivalence between Zwanziger's horizon function and Gribov's no-pole ghost form factor
Abstract The ghost form factor entering the Gribov no-pole condition is evaluated till the third order in the gauge fields. The resulting expression turns out to coincide with Zwanziger's horizon function implementing the restriction to the Gribov...
2009 / A.J. Gómez, M.S. Guimaraes, R.F. Sobreiro, S.P. Sorella -
Scalar perturbation and stability of Ricci dark energy
Abstract The Ricci dark energy (RDE) proposed to explain the accelerating expansion of the universe requires its parameter α < 1 , whose value will...
2009 / Chao-Jun Feng, Xin-Zhou Li -
Dark energy interacting with dark matter and a third fluid: Possible EoS for this component
Abstract A cosmological model of dark energy interacting with dark matter and another general component of the universe is considered. The equations for the coincidence parameters r and s, which represent the ratios between dark energy and dark...
2011 / Norman Cruz, Samuel Lepe, Francisco Peña -
Cosmic spherical void via coarse-graining and averaging non-spherical structures
Abstract Inhomogeneous cosmological models are able to fit cosmological observations without dark energy under the assumption that we live close to the “center” of a very large-scale under-dense region. Most studies fitting observations by means of...
2011 / Krzysztof Bolejko, Roberto A. Sussman