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18 December 2009 year (time zone GMT 00:00)  Number of sources in English: 4957
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Energy dependence of pion interferometry scales in ultra-relativistic heavy ion collisions. (arXiv:0912.3457v1 [nucl-th])

18.12.2009 19:52    arxiv.org
A study of energy behavior of the pion spectra and interferometry scales iscarried out for the top SPS, RHIC and LHC energies within the hydrokineticapproach. The latter allows one to describe evolution of quark-gluon and hadronmatter as well as continuous
World    Physics    Articles
Energy dependence of pion interferometry scales in ultra-relativistic heavy ion collisions. (arXiv:0912.3457v1 [nucl-th])


A relativistic coupled-channel formalism for the pion form factor. (arXiv:0912.3454v1 [nucl-th])

18.12.2009 19:52    arxiv.org
The electromagnetic form factor of a confined quark-antiquark pair iscalculated within the framework of point-form relativistic quantum mechanics.The dynamics of theexchanged photon is explicitly taken into account bytreating theelectromagnetic scattering of an electron by a meson as arelativistic two-channel problem
World    Physics    Articles
A relativistic coupled-channel formalism for the pion form factor. (arXiv:0912.3454v1 [nucl-th])

Transverse hydrodynamics with sudden hadronization -- production of strangeness. (arXiv:0912.3451v1 [nucl-th])

18.12.2009 19:51    arxiv.org
We consider a physical scenario for ultra-relativistic heavy-ion collisionswhere, at the early stage, only transverse degrees of freedom of partons arethermalized, while the longitudinal motion is described by free streaming. Whenthe energy density of the partonic system drops to a
World    Physics    Articles
Transverse hydrodynamics with sudden hadronization -- production of strangeness. (arXiv:0912.3451v1 [nucl-th])

Parton rescattering effect on particle production in ultra-relativistic p+p collisions. (arXiv:0912.3342v1 [nucl-th])

18.12.2009 19:51    arxiv.org
The parton rescattering effect on the charged particle production inultra-relativistic p+p collisions is studied by the parton and hadron cascademodel, PACIAE, based on PYTHIA. We have calculated charged particlepseudorapidity density ($dN_{ch}/d\eta$) at mid-rapidity and the pseudorapiditydistribution in inelastic and non-single
World    Physics    Articles
Parton rescattering effect on particle production in ultra-relativistic p+p collisions. (arXiv:0912.3342v1 [nucl-th])


Nuclear astrophysics studies with ultra-peripheral heavy-ion collisions. (arXiv:0912.3307v1 [nucl-th])

18.12.2009 19:51    arxiv.org
I describe in very simple terms the theoretical tools needed to investigateultra-peripheral nuclear reactions for nuclear astrophysics purposes. For amore detailed account, see .
World    Physics    Articles
Nuclear astrophysics studies with ultra-peripheral heavy-ion collisions. (arXiv:0912.3307v1 [nucl-th])

Calculations of Polarization Observables in Pseudoscalar Meson Photo-production Reactions. (arXiv:0912.3505v2 [nucl-th])

18.12.2009 19:50    arxiv.org
In preparation for the extraction of pseudoscalar meson photo-productionamplitudes from a new generation of complete experiments, we assemble therelations between experimental observables and the Chew-Goldberger-Low-Nambuamplitudes. We present expressions that allow the direct calculation of matrixelements with arbitrary spin projections and
World    Physics    Articles
Calculations of Polarization Observables in Pseudoscalar Meson Photo-production Reactions. (arXiv:0912.3505v2 [nucl-th])

Isospin effects in a covariant transport approach to spallation reactions: Analysis of $p+Fe$ and $Pb$ reactions at 0.8, 1.2 and

18.12.2009 19:50    arxiv.org
We have investigated the influence of different non-linear relativistic meanfield models ($NL$, $NL\rho$ and $NL\rho\delta$) on spallation neutrons forp+Fe and Pb reactions at 0.8, 1.2 and 1.6 GeV by means of a relativisticBoltzmann Uehling Uhlenbeck (RBUU) approach plus a statisticalmultifragmentation
World    Physics    Articles
Isospin effects in a covariant transport approach to spallation reactions: Analysis of $p+Fe$ and $Pb$ reactions at 0.8, 1.2 and

Double and single pion photoproduction within a dynamical coupled-channels model. (arXiv:0909.1129v2 [nucl-th] UPDATED)

18.12.2009 19:49    arxiv.org
Within a dynamical coupled-channels model which has already been fixed fromanalyzing the data of the pi N -> pi N and gamma N -> pi N reactions, wepresent the predicted double pion photoproduction cross sections up to thesecond resonance region,
World    Physics    Articles
Double and single pion photoproduction within a dynamical coupled-channels model. (arXiv:0909.1129v2 [nucl-th] UPDATED)

Kaons in Dense Half-Skyrmion Matter. (arXiv:0912.3213v1 [hep-ph] CROSS LISTED)

18.12.2009 19:49    arxiv.org
Dense hadronic matter at low temperature is expected to be in crystal and athigh density make a transition to a {\em chirally restored but color-confined}state which is a novel phase hitherto unexplored. This phase transition ispredicted in both skyrmion matter
World    Physics    Articles
Kaons in Dense Half-Skyrmion Matter. (arXiv:0912.3213v1 [hep-ph] CROSS LISTED)

Strange Quark Contributions to Parity-Violating Asymmetries in the Backward Angle G0 Electron Scattering Experiment. (arXiv:0909.5107v2 [nucl-ex] UPDATED)

18.12.2009 19:49    arxiv.org
We have measured parity-violating asymmetries in elastic electron-proton andquasi-elastic electron-deuteron scattering at Q^2 = 0.22 and 0.63 GeV^2. Theyare sensitive to strange quark contributions to currents in the nucleon, and tothe nucleon axial current. The results indicate strange quark contributions
World    Physics    Articles
Strange Quark Contributions to Parity-Violating Asymmetries in the Backward Angle G0 Electron Scattering Experiment. (arXiv:0909.5107v2 [nucl-ex] UPDATED)

CDMS gives possible evidence for dark matter

18.12.2009 16:40    physicsweb.org
Two 'events' silence the rumour mill
World    Physics
CDMS gives possible evidence for dark matter

'Electroweak' stars predicted

18.12.2009 16:40    physicsweb.org
New kind of star would burn quarks and generate neutrinos
World    Physics
'Electroweak' stars predicted

Atomic spins measure ultracold temperatures

18.12.2009 16:40    physicsweb.org
New thermometer could work down to a few trillionths of a Kelvin
World    Physics
Atomic spins measure ultracold temperatures

Multifractal dynamics of stock markets. (arXiv:0912.3390v1 [q-fin.ST])

18.12.2009 14:39    arxiv.org
We present a comparative analysis of multifractal properties of financialtime series built on stock indices from developing (WIG) and developed (S&P500)financial markets. It is shown how the multifractal image of the market isaltered with the change of the length of
World    Physics    Articles
Multifractal dynamics of stock markets. (arXiv:0912.3390v1 [q-fin.ST])

Fractal design for efficient brittle plates under gentle pressure loading. (arXiv:0912.3383v1 [physics.class-ph])

18.12.2009 14:39    arxiv.org
We consider a plate made from an isotropic but brittle elastic material,which is used to span a rigid aperture, across which a small pressuredifference is applied. The problem we address is to find the structure whichuses the least amount of
World    Physics    Articles
Fractal design for efficient brittle plates under gentle pressure loading. (arXiv:0912.3383v1 [physics.class-ph])

Resonance enhancement effects in Raman-enhancing pyramid-like V-shape groove microstructures. (arXiv:0912.3371v1 [physics.optics])

18.12.2009 14:39    arxiv.org
Microscopic pyramidal pits in a reflective surface, a geometry similar to aretroreflector, are frequently used to enhance signal strength. The enhancementeffect is generally attributed to surface plasmons, however, the sub-wavelengthto near-wavelength dimensions of the pyramidal 3D geometry suggestcontributions from diffraction
World    Physics    Articles
Resonance enhancement effects in Raman-enhancing pyramid-like V-shape groove microstructures. (arXiv:0912.3371v1 [physics.optics])

"Shadowing" of the electromagnetic field of relativistic charged particles. (arXiv:0912.3361v1 [physics.acc-ph])

18.12.2009 14:39    arxiv.org
In radiation processes such as a transition radiation, diffraction radiation,etc. based on relativistic electrons passing through or near an opaque screen,the electron self-field is partly shadowed after the screen over a distance ofthe order of the formation length $\gamma^2\lambda$. This
World    Physics    Articles
"Shadowing" of the electromagnetic field of relativistic charged particles. (arXiv:0912.3361v1 [physics.acc-ph])

Performance and Stability of a Winged Vehicle in Ground Effect. (arXiv:0912.3355v1 [physics.class-ph])

18.12.2009 14:38    arxiv.org
Present work deals with the dynamics of vehicles which intentionally operatein the ground proximity. The dynamics in ground effect is influenced by thevehicle orientation with respect to the ground, since the aerodynamic force andmoment coefficients, which in turn depend on
World    Physics    Articles
Performance and Stability of a Winged Vehicle in Ground Effect. (arXiv:0912.3355v1 [physics.class-ph])

Free particle gauge invariance of the Maxwell equations. (arXiv:0912.3324v1 [physics.gen-ph])

18.12.2009 14:38    arxiv.org
In a previous study it was demonstrated that Dirac's relativistic quantumequation for free electrons (DRQM)can be obtained from Maxwell's classicalelectromagnetic field equations (MaxEq). This raises fundamental issues aboutthe demarcation between the classical and quantum domain and about spin. In thepresent
World    Physics    Articles
Free particle gauge invariance of the Maxwell equations. (arXiv:0912.3324v1 [physics.gen-ph])

Wavefunction correction scheme for non fixed-node diffusion Monte Carlo. (arXiv:0912.3401v1 [physics.comp-ph])

18.12.2009 14:38    arxiv.org
Wavefunction correction scheme, which was developed as a variance reductiontool for the fixed-node diffusion Monte Carlo (DMC) computations by Andersonand Freihaut, is applied on the DMC computations without using the fixed-nodeconstraint. This technique is found to be more suitable for
World    Physics    Articles
Wavefunction correction scheme for non fixed-node diffusion Monte Carlo. (arXiv:0912.3401v1 [physics.comp-ph])

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