Physical sciences topic list of research papers
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The Ademollo–Gatto theorem for lattice semileptonic decays
Abstract We present the results of the calculation of the K ℓ 3 ...
2005 / D. Bećirević, G. Martinelli, G. Villadoro -
Constraints on oscillating dark energy models
Abstract The oscillating scenario of route to Lambda was recently proposed by us [O. Hrycyna, M. Szydlowski, Phys. Lett. B 651 (2007) 8, arXiv: 0704.1651 [hep-th]] as an alternative to a cosmological constant in a explanation of the current...
2007 / Aleksandra Kurek, Orest Hrycyna, Marek Szydłowski -
Secluded WIMP dark matter
Abstract We consider a generic mechanism via which thermal relic WIMP dark matter may be decoupled from the Standard Model, namely through a combination of WIMP annihilation to metastable mediators with subsequent delayed decay to Standard Model...
2008 / Maxim Pospelov, Adam Ritz, Mikhail Voloshin -
Demonstration of a solid deuterium source of ultra-cold neutrons
Abstract Ultra-cold neutrons (UCN), neutrons with energies low enough to be confined by the Fermi potential in material bottles, are playing an increasing role in measurements of fundamental properties of the neutron. The ability to manipulate UCN...
2004 / A Saunders, J.M Anaya, T.J Bowles, B.W Filippone, P Geltenbort, et al. -
Detecting a first-order transition in the QCD phase diagram with baryon–baryon correlations
Abstract We suggest baryon–baryon correlations as an experimentally accessible signature for a first-order phase transition between a baryon-rich phase, like quarkyonic, and a baryon-suppressed hadronic phase in the QCD phase diagram. We examine the ...
2010 / Ágnes Mócsy, Paul Sorensen -
T-duality in Ramond–Ramond backgrounds
Abstract Using the pure spinor formalism on the world-sheet, we derive the T-duality rules for all target space couplings in an efficient manner. The world-sheet path integral derivation is a proof of the equivalence of the T-dual Ramond–Ramond...
2008 / Raphael Benichou, Giuseppe Policastro, Jan Troost -
The quark–gluon mixed condensate calculated via field correlators
Abstract The quark–gluon mixed condensate g〈 q ̄ σμνFμνq〉 is calculated in the Gaussian approximation of the field correlator method. In the large N ...
2004 / A. Di Giacomo, Yu.A. Simonov -
Short and long distance contributions to B→K∗γγ
Abstract We study the decay of the neutral B meson to K∗γγ within the framework of the Standard Model, including long distance contributions.
2003 / S.R. Choudhury, A.S. Cornell, Namit Mahajan -
Comparison between decoherence time for a two-state spin ½ system with its corresponding quantum retrieval period2011 / Afshin Shafiee, Arash Tirandaz
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Proton–proton bremsstrahlung towards the elastic limit at 190 MeV incident beam energy
Abstract A series of nucleon–nucleon bremsstrahlung (NNγ) experiments at 190 MeV incident beam energy have been performed at KVI in order to gain more insight into the dynamics governing the bremsstrahlung reaction. After initial measurements...
2005 / M. Mahjour-Shafiei, H.R. Amir-Ahmadi, J.C.S. Bacelar, R. Castelijns, K. Ermisch, et al. -
Heal the world: Avoiding the cosmic doomsday in the holographic dark energy model
Abstract The current observational data imply that the universe would end with a cosmic doomsday in the holographic dark energy model. However, unfortunately, the big-rip singularity will ruin the theoretical foundation of the holographic dark...
2009 / Xin Zhang -
Non-perturbative renormalisation of left–left four-fermion operators with Neuberger fermions
Abstract We outline a general strategy for the non-perturbative renormalisation of composite operators in discretisations based on Neuberger fermions, via a matching to results obtained with Wilson-type fermions. As an application, we consider the...
2006 / P. Dimopoulos, L. Giusti, P. Hernández, F. Palombi, C. Pena, et al. -
Dynamic Causal Models for phase coupling
Abstract This paper presents an extension of the Dynamic Causal Modelling (DCM) framework to the analysis of phase-coupled data. A weakly coupled oscillator approach is used to describe dynamic phase changes in a network of oscillators. The use of...
2009 / W.D. Penny, V. Litvak, L. Fuentemilla, E. Duzel, K. Friston -
Recent neutrino data and a realistic tribimaximal-like neutrino mixing matrix
Abstract In light of the recent neutrino experimental results from the Daya Bay and RENO Collaborations, we construct a realistic tribimaximal-like Pontecorvo–Maki–Nakagawa–Sakata (PMNS) leptonic mixing matrix. Motivated by the Qin–Ma (QM)...
2012 / Y.H. Ahn, Hai-Yang Cheng, Sechul Oh -
Quaternionic and hyper-Kähler metrics from generalized sigma models
Abstract The problem of finding new metrics of interest, in the context of SUGRA, is reduced to two stages: first, solving a generalized BPS sigma model with full quaternionic structure proposed by the authors and, second, constructing the...
2012 / V.I. Afonso, D. Bazeia, D.J. Cirilo-Lombardo -
On the luminescence and absence of luminescence of F centers
Abstract A model, proposed originally by Dexter, Klick and Russell, is used to explain the occurence or non-occurence of F-center luminescence in ionic crystals, in terms of a simple two-state configuration coordinate diagram. In this model, which...
2002 / R.H. Bartram, A.M. Stoneham -
The temperature dependence of the linewidth of iron group ions in MgO
Abstract The linewidths of the paramagnetic resonance lines of Fe1+, Fe3+ and Mn2+ in MgO decrease as a function of increasing temperature in the helium range. This decrease appears to result from a motional narrowing of the contribution to the...
2002 / A.M. Stoneham, K.A. Müller, W. Berlinger -
Hydrogenic-Donor Impurity Binding Energy Dependence of the Electric Field in GaAs/AlxGa1−xAs Quantum Rings2013 / Guangxin Wang, Xiuzhi Duan, Wei Chen
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Development of a NRSE Spectrometer with the Help of McStas – Application to the Design of Present and Future Instruments
Abstract The flux is still a major limiting factor in neutron research. For instruments being supplied by cold neutrons using neutron guides, both at present steady-state and at new spallation neutron sources, it is therefore important to optimize...
2013 / L. Kredler, W. Häußler, N. Martin, P. Böni -
Edge Enhancement in Cold Neutron Imaging: A Comparison of Experiments at Edges and Interfaces with Ray-tracing based on Refraction and Reflection
Abstract In the past decade, increased neutron image resolution with digital detectors, approaching 10μm, combined with more images obtained with cold neutrons, i.e., with neutrons having wavelengths longer than 3Å, have yielded many examples of...
2013 / Leslie G. Butler, Eberhard H. Lehmann