Physical sciences topic list of research papers
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Testing Chameleon Fields with Ultra Cold Neutron Bound States and Neutron Interferometry
Abstract Chameleons can play a role in the recent acceleration of the expansion of the Universe. We present results where chameleon fields modify the terrestrial gravitational potential above a mirror and lead to a small perturbation of the energy...
2014 / Philippe Brax -
Dark matter coupling to electroweak gauge and Higgs bosons: An effective field theory approach
Abstract If dark matter is a new species of particle produced in the early universe as a cold thermal relic (a weakly-interacting massive particle—WIMP), its present abundance, its scattering with matter in direct-detection experiments, its...
2013 / Jing-Yuan Chen, Edward W. Kolb, Lian-Tao Wang -
Triviality of theory in a finite volume scheme adapted to the broken phase
Abstract We study the standard one-component φ 4 ...
2014 / Johannes Siefert, Ulli Wolff -
Design and characterization of novel monolithic pixel sensors for the ALICE ITS upgrade
Abstract Within the R&D activities for the upgrade of the ALICE Inner Tracking System (ITS), Monolithic Active Pixel Sensors (MAPS) are being developed and studied, due to their lower material budget ( ~ ...
2014 / C. Cavicchioli, P.L. Chalmet, P. Giubilato, H. Hillemanns, A. Junique, et al. -
a0(980)–f0(980) mixing and isospin violation in the reactions pN→da0, pd→3He/3Ha0 and dd→4Hea0
Abstract It is demonstrated that f 0–a 0 mixing can lead to a comparatively large isospin violation in the reactions pN→da 0, pd→3 He/3 H ...
2002 / V.Yu Grishina, L.A Kondratyuk, M Büscher, W Cassing, H Ströher -
Determination of ΛMS from quenched and Nf=2 dynamical QCD
Abstract The scale parameter Λ MS is computed on the lattice in the quenched approximation and for N ...
2002 / S. Booth, M. Göckeler, R. Horsley, A.C. Irving, B. Joo, et al. -
Supersymmetric model of neutrino mass and leptogenesis with string-scale unification
Abstract Adjoint supermultiplets (1,3,0) and (8,1,0) modify the evolution of gauge couplings. If the unification of gauge couplings occurs at the string scale, their masses are fixed at around 1013 GeV. This scale coincides with expected gaugino...
2002 / Biswajoy Brahmachari, Ernest Ma, Utpal Sarkar -
Traveltime biases in random media and the S-wave discrepancy2004 / A. M. Baig, F. A. Dahlen
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Effective action for the homogeneous radion in brane cosmology
Abstract We consider cosmological two-brane models with AdS bulk, for which the radion, i.e., the separation between the two branes, is time dependent. In the case of two de Sitter branes (including Minkowski branes as a limiting case), we compute...
2002 / David Langlois, Lorenzo Sorbo -
Has neutrinoless double β decay of 76Ge been really observed?
Abstract The claim of discovery of the neutrinoless double beta (0ν2β) decay of 76Ge [Mod. Phys. Lett. A 16 (2001) 2409] is considered critically and firm conclusion about, at least, prematurity of such a claim is derived on the basis of a simple...
2002 / Yu.G Zdesenko, F.A Danevich, V.I Tretyak -
Democratic approach to atmospheric and solar neutrino oscillations
Abstract Working with a U(1) flavor symmetry, we show how the hierarchical structure in the charged fermion sector and a democratic approach for neutrinos that yields large solar and atmospheric neutrino mixings can be...
2002 / Qaisar Shafi, Zurab Tavartkiladze -
Order αs2 perturbative QCD corrections to the Gottfried sum rule
Abstract The order α s 2 perturbative QCD correction to the Gottfried sum rule is obtained. The result is based on numerical calculation of the order α ...
2003 / A.L. Kataev, G. Parente -
Relating different approaches to nuclear broadening
Abstract Transverse momentum broadening of fast partons propagating through a large nucleus is proportional to the average color field strength in the nucleus. In this work, the corresponding coefficient is determined in three different frameworks,...
2003 / Jörg Raufeisen -
Higher-order calculations of electron–deuteron scattering in nuclear effective theory
Abstract Motivated by recent advances in the application of effective field theory techniques to light nuclei we revisit the problem of electron–deuteron scattering in these approaches. Applying Weinberg's power counting for two-nucleon processes to ...
2003 / Daniel R. Phillips -
Final state interaction effects in 3He(e→,e′p)
Abstract Asymmetries in quasi-elastic 3 He ( e ...
2003 / C. Carasco, J. Bermuth, P. Merle, P. Bartsch, D. Baumann, et al. -
Renormalisability of non-homogeneous T-dualised sigma-models
Abstract The quantum equivalence between σ-models and their non-Abelian T-dualised partners is examined for a large class of four dimensional non-homogeneous and quasi-Einstein metrics with an isometry group SU(2)×U(1). We prove that the one-loop...
2002 / Pierre-Yves Casteill -
Multiscale origin of the magnetocaloric effect in Ni-Mn-Ga shape-memory alloys2003 / Jordi Marcos, Lluís Mañosa, Antoni Planes, Fèlix Casanova, Xavier Batlle, et al.
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A note on the Cardy–Verlinde formula
Abstract We generalize the results of hep-th/0008140 to the case of the (n+1)-dimensional closed FRW universe satisfying a general equation of state of the form p=wρ. We find that the entropy of the universe can no longer be expressed in a form...
2002 / Donam Youm -
Complete factorization of equations of motion in Wess–Zumino theory
Abstract We prove that the equations of motion describing domain walls in a Wess–Zumino theory involving only one chiral matter multiplet can be factorized into first order Bogomol'nyi equations, so that all the topological defects are of the...
2002 / D Bazeia, J Menezes, M.M Santos -
Noncommutative gauge field theories: a no-go theorem
Abstract Studying the general structure of the noncommutative (NC) local groups, we prove a no-go theorem for NC gauge theories. According to this theorem, the closure condition of the gauge algebra implies that: (1) the local NC u(n) algebra only...
2002 / M. Chaichian, P. Prešnajder, M.M. Sheikh-Jabbari, A. Tureanu