Physical sciences topic list of research papers
-
Effect of the Born–Infeld parameter in higher dimensional Hawking radiation
Abstract We show in detail that the Hawking temperature calculated from the surface gravity is in agreement with the result of exact semi-classical radiation spectrum for higher dimensional linear dilaton black holes in various theories. We extend...
2009 / S. Habib Mazharimousavi, I. Sakalli, M. Halilsoy -
Pion–photon transition distribution amplitudes in the spectral quark model
Abstract The vector and axial pion–photon transition distribution amplitudes are analyzed in the spectral quark model. We proceed by the evaluation of double distributions through the use of a manifestly covariant calculation based on the α...
2007 / Wojciech Broniowski, Enrique Ruiz Arriola -
Type II seesaw and the PAMELA/ATIC signals
Abstract We discuss how the cosmic ray signals reported by the PAMELA and ATIC/PPB-BETS experiments may be understood in a Standard Model (SM) framework supplemented by type II seesaw and a stable SM singlet scalar boson as dark matter. A particle...
2009 / Ilia Gogoladze, Nobuchika Okada, Qaisar Shafi -
Static BPS black hole in 4d higher-spin gauge theory
Abstract We find exact spherically symmetric solution of 4d nonlinear bosonic higher-spin gauge theory, that preserves a quarter of supersymmetries of N = 2 ...
2009 / V.E. Didenko, M.A. Vasiliev -
A simple derivation of the overlap Dirac operator
Abstract We derive the vector-like four-dimensional overlap Dirac operator starting from a five-dimensional Dirac action in the presence of a delta-function space–time defect. The effective operator is obtained by first integrating out all the...
2007 / C.D. Fosco, G. Torroba, H. Neuberger -
The nucleon axial-vector coupling beyond one loop
Abstract We analyze the nucleon axial-vector coupling to two loops in chiral perturbation theory. We show that chiral extrapolations based on this representation require lattice data with pion masses below 300 MeV.
2006 / Véronique Bernard, Ulf-G. Meißner -
Normal ordering and boundary conditions for fermionic string coordinates
Abstract We build up normal ordered products for fermionic open string coordinates consistent with boundary conditions. The results are obtained considering the presence of antisymmetric tensor fields. We find a discontinuity of the normal ordered...
2006 / Nelson R.F. Braga, Hector L. Carrion, Cresus F.L. Godinho -
Deeply virtual Compton scattering beyond next-to-leading order: The flavor singlet case
Abstract We study radiative corrections to deeply virtual Compton scattering in the kinematics of HERA collider experiments to next-to-leading and next-to-next-to-leading order. In the latter case the radiative corrections are evaluated in a special ...
2007 / K. Kumerički, D. Müller, K. Passek-Kumerički, A. Schäfer -
The private Higgs
Abstract We introduce Higgs democracy in the Yukawa sector by constructing a model with a private Higgs and a dark scalar for each fermion thus addressing the large hierarchy among fermion masses. The model has interesting implications for the LHC,...
2008 / Rafael A. Porto, A. Zee -
Polarized proton scattering on 58Ni at small momentum transfer: A test of the microscopic optical model and effective interactions
Abstract The reaction 58Ni( p → , p ...
2005 / F. Hofmann, C. Bäumer, A.M. van den Berg, D. Frekers, V.M. Hannen, et al. -
On Sp(0) factors and orientifolds
Abstract We discuss the geometric engineering of SO/Sp gauge theories with symmetric or antisymmetric tensor matter and show that the ‘mysterious’ rank zero gauge group factors observed by a few authors can be traced back to the effects of an...
2004 / K. Landsteiner, C.I. Lazaroiu -
Chaplygin gas may prevent big trip
Abstract This Letter deals with the study of the accretion of a generalized Chaplygin gas with equation of state p = − A / ...
2006 / José A. Jiménez Madrid -
Weak gravity conjecture with large extra dimensions
Abstract In the presence of large extra dimensions, the fundamental Planck scale can be much lower than the apparent four-dimensional Planck scale. In this setup, the weak gravity conjecture implies a much more stringent constraint on the UV cutoff...
2007 / Qing-Guo Huang -
CP-odd invariants in models with several Higgs doublets
Abstract We present CP-odd Higgs-basis invariants, which can be used to signal explicit CP violation in a multi-Higgs system, written in an arbitrary Higgs basis. These invariants are constructed in terms of the parameters of the Lagrangian and are...
2005 / Gustavo C. Branco, M.N. Rebelo, J.I. Silva-Marcos -
No “big trips” for the universe
Abstract It has been claimed in several papers that a phantom energy-dominated universe can undergo a “big trip”, i.e., tunneling through a wormhole that grows faster than the cosmic substratum due to the accretion of phantom energy, and will...
2007 / Valerio Faraoni -
Dark matter annihilation in the Galactic Center as seen by the Fermi Gamma Ray Space Telescope
Abstract We analyze the first two years of data from the Fermi Gamma Ray Space Telescope from the direction of the inner 10° around the Galactic Center with the intention of constraining, or finding evidence of, annihilating dark matter. We find...
2011 / Dan Hooper, Lisa Goodenough -
Explosive phenomena in modified gravity
Abstract Observational manifestations of some models of modified gravity, which have been suggested to explain the accelerated cosmological expansion, are analyzed for gravitating systems with time dependent mass density. It is shown that if the...
2011 / E.V. Arbuzova, A.D. Dolgov -
Charged condensation
Abstract We consider Bose–Einstein condensation of massive electrically charged scalars in a uniform background of charged fermions. We focus on the case when the scalar condensate screens the background charge, while the net charge of the system...
2007 / Gregory Gabadadze, Rachel A. Rosen -
High energy neutrino spin light
Abstract The quantum theory of spin light (electromagnetic radiation emitted by a Dirac massive neutrino propagating in dense matter due to the weak interaction of a neutrino with background fermions) is developed. In contrast to the Cherenkov...
2005 / A.E. Lobanov -
How to observe 8B solar neutrinos in liquid scintillator detectors
Abstract We show that liquid organic scintillator detectors (e.g., KamLAND and Borexino) can measure the 8B solar neutrino flux by means of the ν e ...
2005 / A. Ianni, D. Montanino, F.L. Villante