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http://hdl.handle.net/10261/49
20150227T05:49:17Z

Hindered gamowteller decay to the oddodd N=Z Ga 62: Absence of protonneutron T=0 condensate in A=62
http://hdl.handle.net/10261/110287
Title: Hindered gamowteller decay to the oddodd N=Z Ga 62: Absence of protonneutron T=0 condensate in A=62
Authors: Grodner, E.; Gadea, A.; Sarriguren, Pedro; Lenzi, S.M.; Poves, A.; Quintana, B.; RintaAntila, S.; Rubio, B.; Nara Singh, B.S.; Steer, A.N.; Verma, S.; Wadsworth, R.; Wieland, O.; Wollersheim, H.J.
Abstract: Search for a new kind of superfluidity built on collective protonneutron pairs with aligned spin is performed studying the GamowTeller decay of the T=1, Jπ=0+ ground state of Ge62 into excited states of the oddodd N=Z nucleus Ga62. The experiment is performed at GSI Helmholtzzentrum für Shwerionenforshung with the Ge62 ions selected by the fragment separator and implanted in a stack of Sistrip detectors, surrounded by the RISING Ge array. A halflife of T1/2=82.9(14)ms is measured for the Ge62 ground state. Six excited states of Ga62, populated below 2.5 MeV through GamowTeller transitions, are identified. Individual GamowTeller transition strengths agree well with theoretical predictions of the interacting shell model and the quasiparticle random phase approximation. The absence of any sizable lowlying GamowTeller strength in the reported betadecay experiment supports the hypothesis of a negligible role of coherent T=0 protonneutron correlations in Ga62. © 2014 American Physical Society.
Description: E. Grodner et al. ; 5 pags. ; 4 figs. ; 1 tab. ; PACS numbers: 21.60.Cs, 23.20.Lv, 23.40.−s
20150205T10:42:15Z

Hindered gamowteller decay to the oddodd N=Z Ga 62: Absence of protonneutron T=0 condensate in A=62
http://hdl.handle.net/10261/110287
Title: Hindered gamowteller decay to the oddodd N=Z Ga 62: Absence of protonneutron T=0 condensate in A=62
Authors: Grodner, E.; Gadea, A.; Sarriguren, Pedro; Lenzi, S.M.; Poves, A.; Quintana, B.; RintaAntila, S.; Rubio, B.; Nara Singh, B.S.; Steer, A.N.; Verma, S.; Wadsworth, R.; Wieland, O.; Wollersheim, H.J.
Abstract: Search for a new kind of superfluidity built on collective protonneutron pairs with aligned spin is performed studying the GamowTeller decay of the T=1, Jπ=0+ ground state of Ge62 into excited states of the oddodd N=Z nucleus Ga62. The experiment is performed at GSI Helmholtzzentrum für Shwerionenforshung with the Ge62 ions selected by the fragment separator and implanted in a stack of Sistrip detectors, surrounded by the RISING Ge array. A halflife of T1/2=82.9(14)ms is measured for the Ge62 ground state. Six excited states of Ga62, populated below 2.5 MeV through GamowTeller transitions, are identified. Individual GamowTeller transition strengths agree well with theoretical predictions of the interacting shell model and the quasiparticle random phase approximation. The absence of any sizable lowlying GamowTeller strength in the reported betadecay experiment supports the hypothesis of a negligible role of coherent T=0 protonneutron correlations in Ga62. © 2014 American Physical Society.
Description: E. Grodner et al. ; 5 pags. ; 4 figs. ; 1 tab. ; PACS numbers: 21.60.Cs, 23.20.Lv, 23.40.−s
20150205T10:42:15Z

PRISM (Polarized Radiation Imaging and Spectroscopy Mission): an extended white paper
http://hdl.handle.net/10261/110222
Title: PRISM (Polarized Radiation Imaging and Spectroscopy Mission): an extended white paper
Authors: André, Philippe; Barreiro, R. Belén; Casas, F. J.; Diego, J. M.; Fosalba, Pablo; GarcíaBellido, Juan; GonzálezNuevo, J.; Herranz, D.; LópezCaniego, M.; MartínezGonzález, Enrique; Toffolatti, L.; Vielva, P.
Abstract: PRISM (Polarized Radiation Imaging and Spectroscopy Mission) was proposed to ESA in May 2013 as a largeclass mission for investigating within the framework of the ESA Cosmic Vision program a set of important scientific questions that require high resolution, high sensitivity, fullsky observations of the sky emission at wavelengths ranging from millimeterwave to the farinfrared. PRISM's main objective is to explore the distant universe, probing cosmic history from very early times until now as well as the structures, distribution of matter, and velocity flows throughout our Hubble volume. PRISM will survey the full sky in a large number of frequency bands in both intensity and polarization and will measure the absolute spectrum of sky emission more than three orders of magnitude better than COBE FIRAS. The data obtained will allow us to precisely measure the absolute sky brightness and polarization of all the components of the sky emission in the observed frequency range, separating the primordial and extragalactic components cleanly from the galactic and zodiacal light emissions. The aim of this Extended White Paper is to provide a more detailed overview of the highlights of the new science that will be made possible by PRISM, which include: (1) the ultimate galaxy cluster survey using the SunyaevZeldovich (SZ) effect, detecting approximately 106 clusters extending to large redshift, including a characterization of the gas temperature of the brightest ones (through the relativistic corrections to the classic SZ template) as well as a peculiar velocity survey using the kinetic SZ effect that comprises our entire Hubble volume; (2) a detailed characterization of the properties and evolution of dusty galaxies, where the most of the star formation in the universe took place, the faintest population of which constitute the diffuse CIB (Cosmic Infrared Background); (3) a characterization of the B modes from primordial gravity waves generated during inflation and from gravitational lensing, as well as the ultimate search for primordial nonGaussianity using CMB polarization, which is less contaminated by foregrounds on small scales than the temperature anisotropies; (4) a search for distortions from a perfect blackbody spectrum, which include some nearly certain signals and others that are more speculative but more informative; and (5) a study of the role of the magnetic field in star formation and its interaction with other components of the interstellar medium of our Galaxy. These are but a few of the highlights presented here along with a description of the proposed instrument.
20150204T11:13:55Z

Finite theories before and after the discovery of a Higgs boson at the LHC
http://hdl.handle.net/10261/109250
Title: Finite theories before and after the discovery of a Higgs boson at the LHC
Authors: Heinemeyer, Sven; Mondragón, M.; Zoupanos, George
Abstract: Finite Unified Theories (FUTs) are N = 1 supersymmetric Grand Unified Theories (GUTs) which can be made finite to allloop orders, based on the principle of reduction of couplings, and therefore are provided with a large predictive power. Confronting the predictions of SU(5) FUTs with the top and bottom quark masses and other lowenergy experimental constraints a light Higgsboson mass in the range Mh ~ 121126 GeV was predicted, in striking agreement with the recent discovery of a Higgslike state around ~ 125.5 GeV at ATLAS and CMS. Furthermore the favoured model, a finiteness constrained version of the MSSM, naturally predicts a relatively heavy spectrum with coloured supersymmetric particles above ~ 1.5 TeV, consistent with the nonobservation of those particles at the LHC. Restricting further the best FUT's parameter space according to the discovery of a Higgslike state and Bphysics observables we find predictions for the rest of the Higgs masses and the supersymmetric particle spectrum. The combination of results of Finite Unified Theories (FUT) based on SU(5) with the top and bottom quark masses and other lowenergy experimental constraints leads to the prediction of a light Higgsboson mass in the range 121126 GeV in striking agreement with the recent discovery of a Higgslike state around 125.5 GeV at ATLAS and CMS. The favoured model, a finiteness constrained version of the MSSM, naturally predicts a relatively heavy spectrum with coloured supersymmetric particles above 1.5 TeV, consistent with the nonobservation of those particles at the LHC. Restricting the best FUT parameter space according to the discovery of a Higgslike state and Bphysics observables one finds predictions for the rest of the Higgs masses and the supersymmetric particle spectrum. Copyright © 2013 WILEYVCH Verlag GmbH & Co. KGaA, Weinheim.
20150112T10:55:18Z

The Baryon Oscillation Spectroscopic Survery Of SDSSIII
http://hdl.handle.net/10261/108519
Title: The Baryon Oscillation Spectroscopic Survery Of SDSSIII
Authors: Dawson, Kyle; GénovaSantos, Ricardo; PérezFournon, I.; Rebolo López, Rafael; RubinoMartin, J. A.; Scoccola, C. G.; Streblyanska, A.; Prada, Francisco; Mena, Olga
Abstract: The Baryon Oscillation Spectroscopic Survey (BOSS) is designed to measure the scale of baryon acoustic oscillations (BAO) in the clustering of matter over a larger volume than the combined efforts of all previous spectroscopic surveys of largescale structure. BOSS uses 1.5 million luminous galaxies as faint as i = 19.9 over 10,000 deg(2) to measure BAO to redshifts z < 0.7. Observations of neutral hydrogen in the Ly alpha forest in more than 150,000 quasar spectra (g < 22) will constrain BAO over the redshift range 2.15 < z < 3.5. Early results from BOSS include the first detection of the largescale threedimensional clustering of the Ly alpha forest and a strong detection from the Data Release 9 data set of the BAO in the clustering of massive galaxies at an effective redshift z = 0.57. We project that BOSS will yield measurements of the angular diameter distance d(A) to an accuracy of 1.0% at redshifts z = 0.3 and z = 0.57 and measurements of H(z) to 1.8% and 1.7% at the same redshifts. Forecasts for Ly alpha forest constraints predict a measurement of an overall dilation factor that scales the highly degenerate DA(z) and H1(z) parameters to an accuracy of 1.9% at z similar to 2.5 when the survey is complete. Here, we provide an overview of the selection of spectroscopic targets, planning of observations, and analysis of data and data quality of BOSS
20141209T12:15:45Z

Condensed matter realization of the axial magnetic effect
http://hdl.handle.net/10261/98797
Title: Condensed matter realization of the axial magnetic effect
Authors: Chernodub, Maxim N.; Cortijo, Alberto; Grushin, Adolfo G.; Landsteiner, Karl; Vozmediano, María A. H.
Abstract: The axial magneticeffect, i.e., the generation of an energy current parallel to an axial magnetic field coupling with opposite signs to left and righthanded fermions, is a nondissipative transport phenomenon intimately related to the gravitational contribution to the axial anomaly. An axial magnetic field emerges naturally in condensed matter in socalled Weyl semimetals. We present a measurable implementation of the axial magnetic effect. We show that the edge states of a Weyl semimetal at finite temperature possess a temperature dependent angular momentum in the direction of the vector potential intrinsic to the system. Such a realization provides a plausible context for the experimental confirmation of the elusive gravitational anomaly. © 2014 American Physical Society.
20140624T07:44:19Z

Consistent highenergy constraints in the anomalous QCD sector
http://hdl.handle.net/10261/96667
Title: Consistent highenergy constraints in the anomalous QCD sector
Authors: Roig, Pablo; Sanz, Juan José
Abstract: The anomalous 〈VVP〉〈VVP〉 Green function and related formfactors (π0→γ⁎γ⁎π0→γ⁎γ⁎ and τ−→X−νττ−→X−ντ vector formfactors, with X−=(KKπ)−X−=(KKπ)−, φ−γφ−γ, (φV)−(φV)−) are analyzed in this letter in the largeNCNC limit. Within the single (vector and pseudoscalar) resonance approximation and the context of Resonance Chiral Theory, we show that all these observables overdetermine in a consistent way a unique set of compatible highenergy constraints for the resonance couplings. This result is in agreement with analogous relations found in the even intrinsicparity sector of QCD like, e.g., View the MathML sourceFV2=3F2. The antisymmetric tensor formalism is considered for the spinone resonance fields. Finally, we have also worked out and provide here the relation between the two bases of odd intrinsicparity Lagrangian operators commonly employed in the literature.
20140514T09:03:08Z

Critical behavior of 3D Z(N)Z(N) lattice gauge theories at zero temperature
http://hdl.handle.net/10261/96611
Title: Critical behavior of 3D Z(N)Z(N) lattice gauge theories at zero temperature
Authors: Borisenko, O.; Chelnokov, V.; Cortese, G.; Gravina, M.; Papa, Anna; Surzhikov, I.
Abstract: Threedimensional Z(N)Z(N) lattice gauge theories at zero temperature are studied for various values of N . Using a modified phenomenological renormalization group, we explore the critical behavior of the generalized Z(N)Z(N) model for N=2,3,4,5,6,8N=2,3,4,5,6,8. Numerical computations are used to simulate vector models for N=2,3,4,5,6,8,13,20N=2,3,4,5,6,8,13,20 for lattices with linear extension up to L=96L=96. We locate the critical points of phase transitions and establish their scaling with N . The values of the critical indices indicate that the models with N>4N>4 belong to the universality class of the threedimensional XY model. However, the exponent α derived from the heat capacity is consistent with the Ising universality class. We discuss a possible resolution of this puzzle.
20140513T11:45:47Z

A geometric Monte Carlo algorithm for the antiferromagnetic Ising model with “topological” term at θ=π
http://hdl.handle.net/10261/96603
Title: A geometric Monte Carlo algorithm for the antiferromagnetic Ising model with “topological” term at θ=π
Authors: Azcoitia, V.; Cortese, G.; Follana, E.; Giordano, Mara
Abstract: In this work we study the two and threedimensional antiferromagnetic Ising model with an imaginary magnetic field iθ at θ=πθ=π. In order to perform numerical simulations of the system we introduce a new geometric algorithm not affected by the sign problem. Our results for the 2D model are in agreement with the analytical solution. We also present new results for the 3D model which are qualitatively in agreement with meanfield predictions.
20140513T11:17:31Z

Antisymmetric tensor Z p gauge symmetries in field theory and string theory
http://hdl.handle.net/10261/96598
Title: Antisymmetric tensor Z p gauge symmetries in field theory and string theory
Authors: BerasaluceGonzález, Mikel; Ramírez, G.; Uranga Urteaga, Ángel M.
Abstract: We consider discrete gauge symmetries in D dimensions arising as remnants of broken continuous gauge symmetries carried by general antisymmetric tensor fields, rather than by standard 1forms. The lagrangian for such a general Z p gauge theory can be described in terms of a rform gauge field made massive by a (r − 1)form, or other dual realizations, that we also discuss. The theory contains charged topological defects of different dimensionalities, generalizing the familiar charged particles and strings in D = 4. We describe realizations in string theory compactifications with torsion cycles, or with background field strength fluxes. We also provide examples of nonabelian discrete groups, for which the group elements are associated with charged objects of different dimensionality.
Description: BerasaluceGonzález, Mikel et al.
20140513T10:58:49Z