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Cosmological and astrophysical constraints on superconducting cosmic strings
http://dx.doi.org/10.1088/14757516/2013/07/012
by Miyamoto, Koichi (Institute for Cosmic Ray Research, University of Tokyo, Kashiwa 2778582 (Japan)); Nakayama, Kazunori (Department of Physics, University of Tokyo, Bunkyoku, Tokyo 1130033 (Japan)), Email: miyamone@icrr.utokyo.ac.jp, Email: kazunori@hepth.phys.s.utokyo.ac.jp
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http://dx.doi.org/10.1088/14757516/2013/07/012
by Miyamoto, Koichi (Institute for Cosmic Ray Research, University of Tokyo, Kashiwa 2778582 (Japan)); Nakayama, Kazunori (Department of Physics, University of Tokyo, Bunkyoku, Tokyo 1130033 (Japan)), Email: miyamone@icrr.utokyo.ac.jp, Email: kazunori@hepth.phys.s.utokyo.ac.jp
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[en]
We investigate the cosmological and astrophysical constraints on superconducting cosmic
strings (SCSs). SCS loops emit strong bursts of electromagnetic waves, which might
affect various cosmological and astrophysical observations. We take into account the
effect on the CMB anisotropy, CMB blackbody spectrum, BBN, observational implications
on radio wave burst and Xray or γray events, and stochastic gravitational wave background
measured by pulsar timing experiments. We then derive constraints on the parameters
of SCS from current observations and estimate prospects for detecting SCS signatures
in ongoing observations. As a result, we find that these constraints exclude broad
parameter regions, and also that ongoing radio wave observations can probe large
parameter space$$$$SubjectASTROPHYSICS, COSMOLOGY AND ASTRONOMY (S79)
Source/ReportJournal of Cosmology and Astroparticle Physics; v. 2013(07); ISSN 14757516; ; 1 Jul 2013; p. 012; Available from http://dx.doi.org/10.1088/14757516/2013/07/012; Country of input: International Atomic Energy Agency (IAEA)
Record TypeJournal article
Country/Org.United States
DECCOSMIC RADIO SOURCES, ELECTROMAGNETIC RADIATION, IONIZING RADIATIONS, PHYSICS, RADIATIONS
DEIANISOTROPY, ASTROPHYSICS, COSMOLOGY, GRAVITATIONAL WAVES, LIMITING VALUES, PULSARS, RADIOWAVE RADIATION, SPACE, STOCHASTIC PROCESSES, X RADIATION
LanguageEnglish
Ref. Number45104150
Publ. Year2013
INIS Volume45
INIS Issue46
External URLhttp://dx.doi.org/10.1088/14757516/2013/07/012
Curvature perturbation in multifield inflation with nonminimal coupling
http://dx.doi.org/10.1088/14757516/2012/07/039
by White, Jonathan; Minamitsuji, Masato; Sasaki, Misao (Yukawa Institute for Theoretical Physics, Kyoto University, Kitashirakawa Oiwakecho, Sakyoku, Kyoto 6068502 (Japan)), Email: jwhite@yukawa.kyotou.ac.jp, Email: masato@yukawa.kyotou.ac.jp, Email: misao@yukawa.kyotou.ac.jp
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http://dx.doi.org/10.1088/14757516/2012/07/039
by White, Jonathan; Minamitsuji, Masato; Sasaki, Misao (Yukawa Institute for Theoretical Physics, Kyoto University, Kitashirakawa Oiwakecho, Sakyoku, Kyoto 6068502 (Japan)), Email: jwhite@yukawa.kyotou.ac.jp, Email: masato@yukawa.kyotou.ac.jp, Email: misao@yukawa.kyotou.ac.jp
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[en]
In this paper we discuss a multifield model of inflation in which generally all fields
are nonminimally coupled to the Ricci scalar and have noncanonical kinetic terms.
The background evolution and firstorder perturbations for the model are evaluated
in both the Jordan and Einstein frames, and the respective curvature perturbations
compared. We confirm that they are indeed not the same  unlike in the singlefield
case  and also that the difference is a direct consequence of the isocurvature perturbations
inherent to multifield models. This result leads us to conclude that the notion of
adiabaticity is not invariant under conformal transformations. Using a twofield example
we show that even if in one frame the evolution is adiabatic, meaning that the curvature
perturbation is conserved on superhorizon scales, in general in the other frame isocurvature
perturbations continue to source the curvature perturbation. We also find that it
is possible to realise a particular model in which curvature perturbations in both
frames are conserved but with each being of different magnitude. These examples highlight
that the curvature perturbation itself, despite being gaugeinvariant, does not correspond
directly to an observable. The nonequivalence of the two curvature perturbations
would also be important when considering the addition of Standard Model matter into
the system$$$$SubjectASTROPHYSICS, COSMOLOGY AND ASTRONOMY (S79)
Source/ReportJournal of Cosmology and Astroparticle Physics; v. 2012(07); ISSN 14757516; ; 1 Jul 2012; p. 039; Available from http://dx.doi.org/10.1088/14757516/2012/07/039; Country of input: International Atomic Energy Agency (IAEA)
Record TypeJournal article
Country/Org.United States
DECCOSMOLOGICAL MODELS, ELEMENTARY PARTICLES, EVALUATION, FIELD THEORIES, GRAND UNIFIED THEORY, INVARIANCE PRINCIPLES, MATHEMATICAL MODELS, PARTICLE MODELS, PHYSICS, POSTULATED PARTICLES, QUANTUM FIELD THEORY, UNIFIED GAUGE MODELS
DEIASTROPHYSICS, COMPARATIVE EVALUATIONS, COSMOLOGY, COUPLING, DISTURBANCES, EVOLUTION, GAUGE INVARIANCE, INFLATIONARY UNIVERSE, INFLATONS, SCALARS, STANDARD MODEL, TRANSFORMATIONS
LanguageEnglish
Ref. Number45101404
Publ. Year2012
INIS Volume45
INIS Issue45
External URLhttp://dx.doi.org/10.1088/14757516/2012/07/039
Conserved charges of black holes in Weyl and EinsteinGaussBonnet gravities
http://dx.doi.org/10.1140/epjc/s1005201431560
by Peng, JunJin (SEEE, Wuhan Textile University, Institute of Technical Physics, Wuhan, Hubei (China); Chinese Academy of Sciences, Kavli Institute for Theoretical Physics China, Institute of Theoretical Physics, P.O. Box 2735, Beijing (China))
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http://dx.doi.org/10.1140/epjc/s1005201431560
by Peng, JunJin (SEEE, Wuhan Textile University, Institute of Technical Physics, Wuhan, Hubei (China); Chinese Academy of Sciences, Kavli Institute for Theoretical Physics China, Institute of Theoretical Physics, P.O. Box 2735, Beijing (China))
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[en]
An offshell generalization of the AbbottDeserTekin (ADT) conserved charge was recently
proposed by Kim et al. They achieved this by introducing offshell Noether currents
and potentials. In this paper, we construct the crucial offshell Noether current
by the variation of the Bianchi identity for the expression of EOM, with the help
of the property of Killing vector. Our Noether current, which contains an additional
term that is just one half of the Lie derivative of a surface term with respect to
the Killing vector, takes a different form in comparison with the one in their work.
Then we employ the generalized formulation to calculate the quasilocal conserved
charges for the most general charged spherically symmetric and the dyonic rotating
black holes with AdS asymptotics in fourdimensional conformal Weyl gravity, as well
as the charged spherically symmetric black holes in arbitrary dimensional EinsteinGaussBonnet
gravity coupled to Maxwell or nonlinear electrodynamics in AdS spacetime. Our results
confirm those obtained through other methods in the literature. (orig.)$$$$SubjectASTROPHYSICS, COSMOLOGY AND ASTRONOMY (S79)
Source/ReportEuropean Physical Journal. C; v. 74(11); ISSN 14346044; ; Nov 2014; p. 19; Available from: http://dx.doi.org/10.1140/epjc/s1005201431560
Record TypeJournal article
Country/Org.Germany
DECALGEBRAIC CURRENTS, CURRENTS, FIELD THEORIES, GEOMETRY, INVARIANCE PRINCIPLES, MATHEMATICAL SOLUTIONS, MATHEMATICAL SPACE, MATHEMATICS, MOTION, QUANTUM FIELD THEORY, RELATIVITY THEORY, SPACE, UNIFIEDFIELD THEORIES
DEIANTI DE SITTER SPACE, ASYMPTOTIC SOLUTIONS, BLACK HOLES, CONFORMAL INVARIANCE, CONSERVATION LAWS, CVC THEORY, DIFFERENTIAL GEOMETRY, ELECTRODYNAMICS, FOURDIMENSIONAL CALCULATIONS, GENERAL RELATIVITY THEORY, GRAVITATION, LAGRANGIAN FIELD THEORY, NONLINEAR PROBLEMS, ROTATION, SPACETIME, VECTOR CURRENTS, WEYL UNIFIED THEORY
LanguageEnglish
Ref. Number46017943
Publ. Year2014
INIS Volume46
INIS Issue08
External URLhttp://dx.doi.org/10.1140/epjc/s1005201431560
Solid inflation
http://dx.doi.org/10.1088/14757516/2013/10/011
by Endlich, Solomon; Nicolis, Alberto; Wang, Junpu (Department of Physics and ISCAP, Columbia University, New York, NY 10027 (United States)), Email: solomon@phys.columbia.edu, Email: nicolis@phys.columbia.edu, Email: junpu@phys.columbia.edu
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http://dx.doi.org/10.1088/14757516/2013/10/011
by Endlich, Solomon; Nicolis, Alberto; Wang, Junpu (Department of Physics and ISCAP, Columbia University, New York, NY 10027 (United States)), Email: solomon@phys.columbia.edu, Email: nicolis@phys.columbia.edu, Email: junpu@phys.columbia.edu
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[en]
We develop a cosmological model where primordial inflation is driven by a 'solid',
defined as a system of three derivatively coupled scalar fields obeying certain symmetries
and spontaneously breaking a certain subgroup of these. The symmetry breaking pattern
differs drastically from that of standard inflationary models: time translations are
unbroken. This prevents our model from fitting into the standard effective field theory
description of adiabatic perturbations, with crucial consequences for the dynamics
of cosmological perturbations. Most notably, nongaussianities in the curvature perturbations
are unusually large, with f_{NL} ∼ 1/(εc_{s}^{2}), and have
a novel shape: peaked in the squeezed limit, with anisotropic dependence on how the
limit is approached. Other unusual features include the absence of adiabatic fluctuation
modes during inflation — which does not impair their presence and near scaleinvariance
after inflation — and a slightly blue tilt for the tensor modes$$$$SubjectASTROPHYSICS, COSMOLOGY AND ASTRONOMY (S79)
Source/ReportJournal of Cosmology and Astroparticle Physics; v. 2013(10); ISSN 14757516; ; 1 Oct 2013; p. 011; Available from http://dx.doi.org/10.1088/14757516/2013/10/011; Country of input: International Atomic Energy Agency (IAEA)
Record TypeJournal article
Country/Org.United States
DECINVARIANCE PRINCIPLES, MATHEMATICAL MODELS, VARIATIONS
DEIANISOTROPY, COSMOLOGICAL MODELS, COSMOLOGY, FIELD THEORIES, FLUCTUATIONS, PERTURBATION THEORY, SCALAR FIELDS, SCALE INVARIANCE, SOLIDS, SYMMETRY BREAKING, TENSORS
LanguageEnglish
Ref. Number45104024
Publ. Year2013
INIS Volume45
INIS Issue46
External URLhttp://dx.doi.org/10.1088/14757516/2013/10/011
Interacting warm dark matter
http://dx.doi.org/10.1088/14757516/2013/05/034
by Cruz, Norman; Palma, Guillermo; Zambrano, David (Departamento de Física, Facultad de Ciencia, Universidad de Santiago de Chile, Casilla 307, Santiago (Chile)); Avelino, Arturo (Departamento de Física, DCI, Campus León, Universidad de Guanajuato, CP. 37150, León, Guanajuato (Mexico)), Email: norman.cruz@usach.cl, Email: guillermo.palma@usach.cl, Email: david.zambrano@gmail.com, Email: avelino@fisica.ugto.mx
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http://dx.doi.org/10.1088/14757516/2013/05/034
by Cruz, Norman; Palma, Guillermo; Zambrano, David (Departamento de Física, Facultad de Ciencia, Universidad de Santiago de Chile, Casilla 307, Santiago (Chile)); Avelino, Arturo (Departamento de Física, DCI, Campus León, Universidad de Guanajuato, CP. 37150, León, Guanajuato (Mexico)), Email: norman.cruz@usach.cl, Email: guillermo.palma@usach.cl, Email: david.zambrano@gmail.com, Email: avelino@fisica.ugto.mx
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[en]
We explore a cosmological model composed by a dark matter fluid interacting with a
dark energy fluid. The interaction term has the nonlinear λρ_{m}^{α}ρ_{e}^{β}
form, where ρ_{m} and ρ_{e} are the energy densities of the dark matter
and dark energy, respectively. The parameters α and β are in principle not constrained
to take any particular values, and were estimated from observations. We perform an
analytical study of the evolution equations, finding the fixed points and their stability
properties in order to characterize suitable physical regions in the phase space of
the dark matter and dark energy densities. The constants (λ,α,β) as well as w_{m}
and w_{e} of the EoS of dark matter and dark energy respectively, were estimated
using the cosmological observations of the type Ia supernovae and the Hubble expansion
rate H(z) data sets. We find that the best estimated values for the free parameters
of the model correspond to a warm dark matter interacting with a phantom dark energy
component, with a well goodnessoffit to data. However, using the Bayesian Information
Criterion (BIC) we find that this model is overcame by a warm dark matter – phantom
dark energy model without interaction, as well as by the ΛCDM model. We find also
a large dispersion on the best estimated values of the (λ,α,β) parameters, so even
if we are not able to set strong constraints on their values, given the goodnessoffit
to data of the model, we find that a large variety of theirs values are well compatible
with the observational data used$$$$SubjectASTROPHYSICS, COSMOLOGY AND ASTRONOMY (S79)
Source/ReportJournal of Cosmology and Astroparticle Physics; v. 2013(05); ISSN 14757516; ; 1 May 2013; p. 034; Available from http://dx.doi.org/10.1088/14757516/2013/05/034; Country of input: International Atomic Energy Agency (IAEA)
Record TypeJournal article
Country/Org.United States
DECBINARY STARS, ERUPTIVE VARIABLE STARS, MATHEMATICAL MODELS, MATHEMATICAL SPACE, MATTER, PHYSICAL PROPERTIES, SPACE, STARS, VARIABLE STARS
DEICOSMOLOGICAL CONSTANT, COSMOLOGICAL MODELS, DENSITY, ENERGY DENSITY, EVOLUTION, EXPANSION, LIMITING VALUES, NONLINEAR PROBLEMS, NONLUMINOUS MATTER, PHASE SPACE, SUPERNOVAE
LanguageEnglish
Ref. Number45104247
Publ. Year2013
INIS Volume45
INIS Issue46
External URLhttp://dx.doi.org/10.1088/14757516/2013/05/034
Constraining inflation with future galaxy redshift surveys
http://dx.doi.org/10.1088/14757516/2012/04/005
by Huang, Zhiqi; Vernizzi, Filippo (CEA, Institut de Physique Théorique, 91191 GifsurYvette cédex (France)); Verde, Licia (Institute of Sciences of the Cosmos (ICCUB), University of Barcelona, Marti i Franques 1, Barcelona 08024 (Spain)), Email: zhiqi.huang@cea.fr, Email: liciaverde@icc.ub.edu, Email: filippo.vernizzi@cea.fr
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http://dx.doi.org/10.1088/14757516/2012/04/005
by Huang, Zhiqi; Vernizzi, Filippo (CEA, Institut de Physique Théorique, 91191 GifsurYvette cédex (France)); Verde, Licia (Institute of Sciences of the Cosmos (ICCUB), University of Barcelona, Marti i Franques 1, Barcelona 08024 (Spain)), Email: zhiqi.huang@cea.fr, Email: liciaverde@icc.ub.edu, Email: filippo.vernizzi@cea.fr
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[en]
With future galaxy surveys, a huge number of Fourier modes of the distribution of
the large scale structures in the Universe will become available. These modes are
complementary to those of the CMB and can be used to set constraints on models of
the early universe, such as inflation. Using a MCMC analysis, we compare the power
of the CMB with that of the combination of CMB and galaxy survey data, to constrain
the power spectrum of primordial fluctuations generated during inflation. We base
our analysis on the Planck satellite and a spectroscopic redshift survey with configuration
parameters close to those of the Euclid mission as examples. We first consider models
of slowroll inflation, and show that the inclusion of large scale structure data
improves the constraints by nearly halving the error bars on the scalar spectral index
and its running. If we attempt to reconstruct the inflationary singlefield potential,
a similar conclusion can be reached on the parameters characterizing the potential.
We then study models with features in the power spectrum. In particular, we consider
ringing features produced by a break in the potential and oscillations such as in
axion monodromy. Adding large scale structures improves the constraints on features
by more than a factor of two. In axion monodromy we show that there are oscillations
with small amplitude and frequency in momentum space that are undetected by CMB alone
but can be measured by including galaxy surveys in the analysis$$$$SubjectASTROPHYSICS, COSMOLOGY AND ASTRONOMY (S79)
Source/ReportJournal of Cosmology and Astroparticle Physics; v. 2012(04); ISSN 14757516; ; 1 Apr 2012; p. 005; Available from http://dx.doi.org/10.1088/14757516/2012/04/005; Country of input: International Atomic Energy Agency (IAEA)
Record TypeJournal article
Country/Org.United States
DECCALCULATION METHODS, COSMOLOGICAL MODELS, ELECTROMAGNETIC RADIATION, EVALUATION, MATHEMATICAL MODELS, MICROWAVE RADIATION, PHYSICS, RADIATIONS, VARIATIONS
DEIASTROPHYSICS, COMPARATIVE EVALUATIONS, COSMOLOGY, FLUCTUATIONS, GALAXIES, INFLATIONARY UNIVERSE, MONTE CARLO METHOD, OSCILLATIONS, POTENTIALS, RED SHIFT, RELICT RADIATION, SCALARS, SPACE, UNIVERSE
LanguageEnglish
Ref. Number45101465
Publ. Year2012
INIS Volume45
INIS Issue45
External URLhttp://dx.doi.org/10.1088/14757516/2012/04/005
Cosmography with the SunyaevZeldovich effect and Xray data
http://dx.doi.org/10.1088/14757516/2013/06/033
by Holanda, R.F.L. (Departamento de Física, Universidade Estadual da Paraíba, 58429500, Campina Grande  PB (Brazil)); Alcaniz, J.S.; Carvalho, J.C. (Departamento de Astronomia, Observatório Nacional, 20921400, Rio de Janeiro  RJ (Brazil)), Email: holanda@uepb.edu.br, Email: alcaniz@on.br, Email: carvalho@dfte.ufrn.br
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http://dx.doi.org/10.1088/14757516/2013/06/033
by Holanda, R.F.L. (Departamento de Física, Universidade Estadual da Paraíba, 58429500, Campina Grande  PB (Brazil)); Alcaniz, J.S.; Carvalho, J.C. (Departamento de Astronomia, Observatório Nacional, 20921400, Rio de Janeiro  RJ (Brazil)), Email: holanda@uepb.edu.br, Email: alcaniz@on.br, Email: carvalho@dfte.ufrn.br
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[en]
Cosmography provides a direct method to map the expansion history of the Universe
in a modelindependent way. Recently, different kinds of observations have been used
in cosmographic analyses, such as SNe Ia and gamma ray bursts measurements, weak and
strong lensing, cosmic microwave background anisotropies, etc. In this work we examine
the prospects for constraining cosmographic parameters from current and future measurements
of galaxy clusters distances based on their SunyaevZeldovich effect (SZE) and Xray
observations. By assuming the current observational error distribution, we perform
Monte Carlo simulations based on a wellbehaved parameterization for the deceleration
parameter to generate samples with different characteristics and study the improvement
on the determination of the cosmographic parameters from upcoming data. The influence
of galaxy clusters (GC) morphologies on the H_{0}−q_{0} plane is also
investigated$$$$SubjectASTROPHYSICS, COSMOLOGY AND ASTRONOMY (S79)
Source/ReportJournal of Cosmology and Astroparticle Physics; v. 2013(06); ISSN 14757516; ; 1 Jun 2013; p. 033; Available from http://dx.doi.org/10.1088/14757516/2013/06/033; Country of input: International Atomic Energy Agency (IAEA)
Record TypeJournal article
Country/Org.United States
DECBINARY STARS, CALCULATION METHODS, COSMIC RADIATION, ELECTROMAGNETIC RADIATION, ERUPTIVE VARIABLE STARS, IONIZING RADIATIONS, MICROWAVE RADIATION, PHYSICS, PRIMARY COSMIC RADIATION, RADIATIONS, SIMULATION, STARS, VARIABLE STARS
DEIACCELERATION, ANISOTROPY, ASTROPHYSICS, COMPUTERIZED SIMULATION, COSMIC GAMMA BURSTS, COSMOLOGY, DISTANCE, EXPANSION, GALAXY CLUSTERS, MONTE CARLO METHOD, MORPHOLOGY, RELICT RADIATION, SUPERNOVAE, UNIVERSE
LanguageEnglish
Ref. Number45104128
Publ. Year2013
INIS Volume45
INIS Issue46
External URLhttp://dx.doi.org/10.1088/14757516/2013/06/033
Population study of pulsarwind nebulae with H.E.S.S
by Mayer, Michael (Universitaet Potsdam (Germany); DESY (Germany)); H.E.S.S.Collaboration
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by Mayer, Michael (Universitaet Potsdam (Germany); DESY (Germany)); H.E.S.S.Collaboration
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German 2013 [1 p.] Germany Mayer, Michael Universitaet Potsdam (Germany)
DESY (Germany) HESSCollaboration Bibliographic ... $$$$
Orig. TitlePopulationsstudie von Pulsarwindnebeln mit H.E.S.S.
SubjectASTROPHYSICS, COSMOLOGY AND ASTRONOMY (S79)
Source/ReportVerhandlungen der Deutschen Physikalischen Gesellschaft; (Dresden 2013 issue); ISSN 04200195; ; CODEN VDPEAZ; 2013; [1 p.]; 77. Annual meeting with ordinary general meeting of the DPG and 2013 Spring meeting with the divisions hadrons and nuclei, particle physics, the working teams equal opportunities, energy, the working groups information, young DPG, philosophy of the physics, physics and disarmament; 77. Jahrestagung der DPG mit Ordentlicher Mitgliederversammlung und DPGFruehjahrstagung 2013 mit den Fachverbaenden Physik der Hadronen und Kerne, Teilchenphysik den Arbeitskreisen Chancengleichheit, Energie den Arbeitsgruppen Information, junge DPG, Physik und Abruestung; Dresden (Germany); 48 Mar 2013; Available from http://www.dpgverhandlungen.de; Session: T 84.8 Mi 18:30; Also available as printed version: Verhandlungen der Deutschen Physikalischen Gesellschaft v. 48(2)
Record TypeJournal article
Country/Org.Germany
DECBOSONS, COSMIC RADIATION, COSMIC RADIO SOURCES, COSMIC RAY SOURCES, ELECTROMAGNETIC RADIATION, ELEMENTARY PARTICLES, ENERGY RANGE, GALAXIES, GEV RANGE, IONIZING RADIATIONS, MASSLESS PARTICLES, PHOTONS, RADIATIONS, STELLAR ACTIVITY
DEICOSMIC GAMMA SOURCES, COSMIC PHOTONS, GAMMA RADIATION, GEV RANGE 1001000, MILKY WAY, PULSARS, STELLAR WINDS, TEV RANGE
LanguageGerman
Ref. Number46000521
Publ. Year2013
INIS Volume46
INIS Issue01
DESY (Germany) HESSCollaboration Bibliographic ... $$$$
Orig. TitlePopulationsstudie von Pulsarwindnebeln mit H.E.S.S.
SubjectASTROPHYSICS, COSMOLOGY AND ASTRONOMY (S79)
Source/ReportVerhandlungen der Deutschen Physikalischen Gesellschaft; (Dresden 2013 issue); ISSN 04200195; ; CODEN VDPEAZ; 2013; [1 p.]; 77. Annual meeting with ordinary general meeting of the DPG and 2013 Spring meeting with the divisions hadrons and nuclei, particle physics, the working teams equal opportunities, energy, the working groups information, young DPG, philosophy of the physics, physics and disarmament; 77. Jahrestagung der DPG mit Ordentlicher Mitgliederversammlung und DPGFruehjahrstagung 2013 mit den Fachverbaenden Physik der Hadronen und Kerne, Teilchenphysik den Arbeitskreisen Chancengleichheit, Energie den Arbeitsgruppen Information, junge DPG, Physik und Abruestung; Dresden (Germany); 48 Mar 2013; Available from http://www.dpgverhandlungen.de; Session: T 84.8 Mi 18:30; Also available as printed version: Verhandlungen der Deutschen Physikalischen Gesellschaft v. 48(2)
Record TypeJournal article
Country/Org.Germany
DECBOSONS, COSMIC RADIATION, COSMIC RADIO SOURCES, COSMIC RAY SOURCES, ELECTROMAGNETIC RADIATION, ELEMENTARY PARTICLES, ENERGY RANGE, GALAXIES, GEV RANGE, IONIZING RADIATIONS, MASSLESS PARTICLES, PHOTONS, RADIATIONS, STELLAR ACTIVITY
DEICOSMIC GAMMA SOURCES, COSMIC PHOTONS, GAMMA RADIATION, GEV RANGE 1001000, MILKY WAY, PULSARS, STELLAR WINDS, TEV RANGE
LanguageGerman
Ref. Number46000521
Publ. Year2013
INIS Volume46
INIS Issue01
Realistic fission model and the rprocess in neutron star mergers
http://dx.doi.org/10.1063/1.4875313
by Shibagaki, S.; Kajino, T. (Department of Astronomy, Graduate School of Science, University of Tokyo, 731 Hongo, Bunkyoku, Tokyo 1130033, Japan and National Astronomical Observatory of Japan, 2211 Osawa, Mitaka, Tokyo 1818588 (Japan)); Chiba, S. (Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Ookayama, Meguroku, Tokyo, 1528850 (Japan)); Mathews, G. J. (Center for Astrophysics, Department of Physics, University of Notre Dame, IN 46556, U.S.A. and National Astronomical Observatory of Japan, 2211 Osawa, Mitaka, Tokyo 1818588 (Japan))
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http://dx.doi.org/10.1063/1.4875313
by Shibagaki, S.; Kajino, T. (Department of Astronomy, Graduate School of Science, University of Tokyo, 731 Hongo, Bunkyoku, Tokyo 1130033, Japan and National Astronomical Observatory of Japan, 2211 Osawa, Mitaka, Tokyo 1818588 (Japan)); Chiba, S. (Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Ookayama, Meguroku, Tokyo, 1528850 (Japan)); Mathews, G. J. (Center for Astrophysics, Department of Physics, University of Notre Dame, IN 46556, U.S.A. and National Astronomical Observatory of Japan, 2211 Osawa, Mitaka, Tokyo 1818588 (Japan))
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[en]
About half of heavy elements are considered to be produced by the rapid neutroncapture
process, rprocess. The neutron star merger is one of the viable candidates for the
astrophysical site of rprocess nucleosynthesis. Nuclear fission reactions play an
important role in the rprocess of neutron star mergers. However theoretical predictions
about fission properties of neutronrich nuclei have some uncertainties. Especially,
their fission fragment distributions are totally unknown and the phenomenologically
extrapolated distribution was often applied to nucleosynthesis calculations. In this
study, we have carried out rprocess nucleosynthesis calculations based upon new theoretical
estimates of fission fragment distributions. We discuss the effects on the rprocess
in neutron star mergers from the nuclear fission of heavy neutronrich actinide elements.
We also discuss how variations in the fission fragment distributions affect the abundance
pattern$$$$SubjectASTROPHYSICS, COSMOLOGY AND ASTRONOMY (S79), NUCLEAR PHYSICS AND RADIATION PHYSICS (S73)
Source/ReportAIP Conference Proceedings; v. 1595(1); ISSN 0094243X; ; CODEN APCPCS; 9 May 2014; p. 211213; 7. European summer school on experimental nuclear astrophysics; Santa Tecla, Sicily (Italy); 1517 Sep 2013; (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Record TypeJournal article
Country/Org.United States
DECABUNDANCE, BARYON REACTIONS, BETA DECAY RADIOISOTOPES, BETAMINUS DECAY RADIOISOTOPES, EVOLUTION, HADRON REACTIONS, ISOTOPES, NUCLEAR FRAGMENTS, NUCLEAR REACTIONS, NUCLEON REACTIONS, PHYSICS, RADIOISOTOPES, STAR EVOLUTION, STARS, SYNTHESIS
DEIASTROPHYSICS, CAPTURE, ELEMENT ABUNDANCE, FISSION, FISSION FRAGMENTS, NEUTRON REACTIONS, NEUTRON STARS, NEUTRONRICH ISOTOPES, NUCLEOSYNTHESIS, R PROCESS
LanguageEnglish
Ref. Number45101749
Publ. Year2014
INIS Volume45
INIS Issue45
External URLhttp://dx.doi.org/10.1063/1.4875313
Gradient expansion of superhorizon perturbations in Ginflation
http://dx.doi.org/10.1088/14757516/2013/07/020
by Frusciante, Noemi; Zhou, ShuangYong; Sotiriou, Thomas P. (SISSA and INFN Sezione di Trieste, Via Bonomea 265, 34136, Trieste (Italy)), Email: nfruscia@sissa.it, Email: szhou@sissa.it, Email: sotiriou@sissa.it
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http://dx.doi.org/10.1088/14757516/2013/07/020
by Frusciante, Noemi; Zhou, ShuangYong; Sotiriou, Thomas P. (SISSA and INFN Sezione di Trieste, Via Bonomea 265, 34136, Trieste (Italy)), Email: nfruscia@sissa.it, Email: szhou@sissa.it, Email: sotiriou@sissa.it
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[en]
We develop the gradient expansion formalism for shiftsymmetric Galileontype actions.
We focus on backgrounds that undergo inflation, work in the synchronous gauge, and
obtain a general solution up to second order without imposing extra conditions at
first order. The solution simplifies during the late stages of inflation. We also
define a curvature perturbation conserved up to first order$$$$SubjectASTROPHYSICS, COSMOLOGY AND ASTRONOMY (S79)
Source/ReportJournal of Cosmology and Astroparticle Physics; v. 2013(07); ISSN 14757516; ; 1 Jul 2013; p. 020; Available from http://dx.doi.org/10.1088/14757516/2013/07/020; Country of input: International Atomic Energy Agency (IAEA)
Record TypeJournal article
Country/Org.United States
DECCOSMOLOGICAL MODELS, ELEMENTARY PARTICLES, INTEGRALS, MATHEMATICAL MODELS, POSTULATED PARTICLES
DEIACTION INTEGRAL, COSMOLOGY, EXPANSION, INFLATIONARY UNIVERSE, INFLATONS, MATHEMATICAL SOLUTIONS, PERTURBATION THEORY, SYMMETRY
LanguageEnglish
Ref. Number45104158
Publ. Year2013
INIS Volume45
INIS Issue46
External URLhttp://dx.doi.org/10.1088/14757516/2013/07/020
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 MATERIALS SCIENCE (S36); ASTROPHYSICS, COSMOLOGY AND ASTRONOMY (S79) (> 22)
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