Physical sciences topic list of research papers
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Revisiting parton evolution and the large-x limit
Abstract This remark is part of an ongoing project to simplify the structure of the multi-loop anomalous dimensions for parton distributions and fragmentation functions. It answers the call for a “structural explanation” of a “very suggestive”...
2006 / Yu.L. Dokshitzer, G. Marchesini, G.P. Salam -
Pairing in fermion systems with unequal masses: Nonperturbative renormalisation group approach
Abstract The application of the nonperturbative renormalisation group approach to a system with two fermion species is studied. Assuming a simple ansatz for the effective action with effective bosons, describing pairing effects we derive a set of...
2006 / Boris Krippa -
Fixed point scenario in the two Higgs doublet model inspired by degenerate vacua
Abstract We consider the renormalisation group flow of Higgs and Yukawa couplings within the simplest non-supersymmetric two Higgs doublet extension of the Standard Model (SM). In this model the couplings are adjusted so that the multiple point...
2007 / C.D. Froggatt, R. Nevzorov, H.B. Nielsen, D. Thompson -
Current lookback time-redshift bounds on dark energy
Abstract We investigate observational constraints on dark energy models from lookback time (LT) estimates of 32 old passive galaxies distributed over the redshift interval 0.11 ⩽ ...
2009 / M.A. Dantas, J.S. Alcaniz, N. Pires -
Exploring proton rich systems and Coulomb induced instabilities
Abstract The thermodynamic properties of proton rich systems are explored in a mean field approach which is generated from a Skyrme interaction. The addition of Coulomb interactions result in asymmetries which modify the chemical and mechanical...
2003 / S.J Lee, A.Z Mekjian -
Proton–nucleus scattering and cross section fluctuations at RHIC and LHC
Abstract We consider high-energy proton–heavy nucleus scattering within the framework of the Glauber–Gribov approximation and taking into account cross section fluctuations. Fixing parameters of the model for cross section fluctuations by the...
2005 / V. Guzey, M. Strikman -
1S0 proton and neutron superfluidity in β-stable neutron star matter
Abstract We investigate the effect of a microscopic three-body force on the proton and neutron superfluidity in the 1S0 channel in β-stable neutron star matter. It is found that the three-body force has only a small effect on the neutron 1S0 pairing ...
2004 / W. Zuo, Z.H. Li, G.C. Lu, J.Q. Li, W. Scheid, et al. -
Dynamically induced spontaneous symmetry breaking in 3–3–1 models
Abstract We show that in SU ( 3 ) ...
2005 / Alex G. Dias, C.A. de S. Pires, V. Pleitez, P.S. Rodrigues da Silva -
Ratio of absorption cross section for Dirac fermion to that for scalar in the higher-dimensional black hole background
Abstract The ratio of the low-energy absorption cross section for Dirac fermion to that for minimally coupled scalar is computed when the spacetimes are various types of the higher-dimensional Reissner–Nordström black holes. It is found that the...
2005 / Eylee Jung, Sung Hoon Kim, D.K. Park -
Interference effect in elastic parton energy loss in a finite medium
Abstract Similar to the radiative parton energy loss due to gluon bremsstrahlung, elastic energy loss of a parton undergoing multiple scattering in a finite medium is demonstrated to be sensitive to interference effect. The interference between...
2007 / Xin-Nian Wang -
On the physical parametrization and magnetic analogs of the Emparan–Teo dihole solution
Abstract The Emparan–Teo non-extremal black dihole solution is reparametrized using Komar quantities and the separation distance as arbitrary parameters. We show how the potential A ...
2008 / J.A. Cázares, H. García-Compeán, V.S. Manko -
Universality of decay-out of superdeformed bands in the 190 mass region
Abstract Superdeformed nuclei in the 190 mass region exhibit a striking universality in their decay-out profiles. We show that this universality can be explained in the two-level model of superdeformed decay as related to the strong separation of...
2008 / D.M. Cardamone, B.R. Barrett, C.A. Stafford -
Harmonic superspaces from superstrings
Abstract We derive harmonic superspaces for N=2,3,4 SYM theory in four dimensions from superstring theory. The pure spinors in ten dimensions are dimensionally reduced and yield the harmonic coordinates. Two anticommuting BRST charges implement...
2004 / P.A Grassi, P van Nieuwenhuizen -
Unnatural oscillon lifetimes in an expanding background
Abstract We consider a classical toy model of a massive scalar field in 1 + 1 dimensions with a constant exponential expansion rate of space. The...
2006 / N. Graham, N. Stamatopoulos -
Generalized Calogero model in arbitrary dimensions
Abstract We define a new multispecies model of Calogero type in D dimensions with harmonic, two-body and three-body interactions. Using the underlying conformal SU(1,1) algebra, we indicate how to find the complete set of the states in Bargmann–Fock ...
2004 / S. Meljanac, M. Mileković, A. Samsarov -
Space–time noncommutativity from particle mechanics
Abstract We exploit the reparametrization symmetry of a relativistic free particle to impose a gauge condition which upon quantization implies space–time noncommutativity. We show that there is an algebraic map from this gauge back to the standard...
2004 / A Pinzul, A Stern -
Effective theory for dark matter and a new force in the dark matter sector
Abstract An effective theory for dark matter has recently been proposed. The key assumption is that the dark matter particle which is a Dirac fermion is protected from decaying by a global U(1) symmetry. We point out that quantum gravity effects...
2009 / Xavier Calmet, Swarup Kumar Majee -
Exploring correlations in the stochastic Yang–Mills vacuum
Abstract The correlation lengths of nonperturbative-nonconfining and confining stochastic background Yang–Mills fields are obtained by means of a direct analytic path-integral evaluation of the Green functions of the so-called one- and two-gluon...
2010 / Dmitri Antonov -
On quantum corrections to spinning strings and Bethe equations
Abstract Recently, it was demonstrated that one-loop energy shifts of spinning superstrings on AdS 5 × ...
2005 / N. Beisert, A.A. Tseytlin -
Extension of an empirical charged lepton mass relation to the neutrino sector
Abstract It is known that the charged lepton masses obey to high precision an interesting empirical relation (Koide relation). In turn, the light neutrino masses cannot obey such a relation. We note that if neutrinos acquire their mass via the...
2011 / Werner Rodejohann, He Zhang