Date: Thu, 28 Oct 10 00:06:13 GMT Subject: nucl-th daily 2 new + 3 crosses received by eprepget ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ Send any comments regarding submissions directly to submitter. ------------------------------------------------------------------------------ Archives at http://arxiv.org/ To unsubscribe, e-mail To: nucl-th@arXiv.org, Subject: cancel ------------------------------------------------------------------------------ received by eprepget from Tue 26 Oct 10 20:00:00 GMT to Wed 27 Oct 10 20:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:1010.5561 Date: Wed, 27 Oct 2010 03:31:01 GMT (463kb) Title: Shape of Lambda hypernuclei in (beta,gamma) deformation plane Authors: Myaing Thi Win, K. Hagino, and T. Koike Categories: nucl-th Comments: 10 pages, 15 figures \\ We study the shape of $\Lambda$ hypernuclei in the full ($\beta,\gamma$) deformation plane, including both axially symmetric and triaxial quadrupole deformations. To this end, we use the constrained Skyrme Hartree-Fock+BCS method on the three-dimensional Cartesian mesh. The potential energy surface is analyzed for carbon hypernuclei as well as for sd-shell hypernuclei such as $^{27,29}_{\Lambda}$Si and $^{25,27}_{\Lambda}$Mg. We show that the potential energy surface in the ($\beta,\gamma$) plane is similar to each other between the hypernuclei and the corresponding core nuclei, although the addition of $\Lambda$ hyperon makes the energy surface somewhat softer along the $\gamma$ direction. Our calculation implies that the energy of the $\gamma$ vibration for $^{25,27}_{\Lambda}$Mg nuclei is lowered by about 0.15 MeV with respect to that of $^{24,26}$Mg nuclei. \\ ( http://arxiv.org/abs/1010.5561 , 463kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5603 Date: Wed, 27 Oct 2010 08:30:00 GMT (39kb) Title: Chiral unitary approach to eta^prime N scattering at low energies Authors: E. Oset and A. Ramos Categories: nucl-th hep-ph Comments: 9 pages, 2 figures \\ We study the eta^prime N interaction using a chiral unitary approach in coupled channels. Since the SU(3) singlet does not contribute to the interaction and the eta^prime is mostly a singlet, the scattering amplitude obtained is small, consistent with some experimental estimate. The eta^prime N amplitude obtained is thus sensitive to the mixing angle between eta and eta^prime. For standard values of the eta-eta^prime mixing, we obtain a scattering length of a_{eta^prime N}=(-0.008+ i 0.025) fm, mostly imaginary and sensibly smaller than the corresponding one for eta N. \\ ( http://arxiv.org/abs/1010.5603 , 39kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:1010.5631 (*cross-listing*) Date: Wed, 27 Oct 2010 09:57:08 GMT (28kb) Title: Pasta Structures of Quark-Hadron Phase Transition in Proto-Neutron Stars Authors: Nobutoshi Yasutake, Toshiki Maruyama, Toshitaka Tatsumi Categories: astro-ph.HE nucl-th Comments: 6 pages, 3 figures, INPC 2010, will be published in "Journal of Physics: Conference Series (JPCS)" \\ We study the quark-hadron mixed phase in proto-neutron stars with the finite-size effects. In the calculations of pasta structures appeared in the mixed phase, the Gibbs conditions require the pressure balance and chemical equilibrium between two phases besides the thermal equilibrium. We find that the region of the mixed phase is limited due to thermal instability. Moreover, we study the effects of neutrinos to the pasta structures. As a result, we find that the existence of neutrinos make the pasta structures unstable, too. These characteristic features of the hadron-quark mixed phase should be important for the middle stage of the evolutions of proto-neutron stars. \\ ( http://arxiv.org/abs/1010.5631 , 28kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5660 (*cross-listing*) Date: Wed, 27 Oct 2010 12:02:10 GMT (65kb) Title: The chiral and angular momentum content of the $\rho$-mesons in lattice QCD Authors: L. Ya. Glozman, C. B. Lang, and M. Limmer Categories: hep-lat hep-ph nucl-th Comments: 7 pages, 1 figure, 1 table, talk given at the XXVIII International Symposium on Lattice Filed Theory (Lattice 2010), June 14-19,2010, Villasimius, Sardinia, Italy Journal-ref: PoS(Lattice 2010)149 \\ The variational method allows one to study the mixing of interpolators with different chiral transformation properties in the nonperturbatively determined physical state. It is then possible to define and calculate in a gauge-invariant manner the chiral as well as the partial wave content of the quark-antiquark component of a meson in the infrared, where mass is generated. Using a unitary transformation from the chiral basis to the $^{2S+1}L_J$ basis one may extract the partial wave content of a meson. We present results for the $\rho$- and $\rho'$-mesons using a simulation with $N_f=2$ dynamical quarks, all for lattice spacings close to 0.15 fm. Our results indicate a strong chiral symmetry breaking in the $\rho$ state and its simple $^3S_1$-wave composition in the infrared. For the $\rho'$-meson we find a small chiral symmetry breaking in the infrared as well as a leading contribution of the $^3D_1$ partial wave, which is contradictory to the quark model. \\ ( http://arxiv.org/abs/1010.5660 , 65kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5687 (*cross-listing*) Date: Wed, 27 Oct 2010 13:53:31 GMT (220kb) Title: Effective Potential and Phase Diagram in the Strong-Coupling Lattice QCD with Next-to-Next-to-Leading Order and Polyakov Loop Effects Authors: Takashi Z. Nakano, (Kyoto U., Yukawa Inst.), Kohtaroh Miura (INFN-Laboratori Nazionali di Frascati, Italy), Akira Ohnishi, (Kyoto U., Yukawa Inst., Kyoto) Categories: hep-lat hep-ph nucl-th Comments: Presented at 28th International Symposium on Lattice Field Theory (Lattice 2010), Villasimius, Sardinia, Italy, 14-19 June, 2010 \\ We investigate chiral and deconfinement transitions in the strong coupling lattice QCD for color SU(3). We combine the leading order Polyakov loop effective action of the strong coupling expansion and the next-to-next-to-leading order (1/g^4) fermionic effective action with one species of unrooted staggered fermion. Two approximation schemes are adopted to evaluate the Polyakov loop effects; a Haar measure method (no fluctuation from the mean field) and a Weiss mean-field method (with fluctuations). The Polyakov loop is found to suppress the chiral condensate and to reduce the chiral transition temperature at mu = 0. The chiral transition temperature roughly reproduces the Monte Carlo results in the region beta = 2N_c /g^2 < 4. \\ ( http://arxiv.org/abs/1010.5687 , 220kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:1007.0889 replaced with revised version Wed, 27 Oct 2010 14:25:58 GMT (73kb) Title: Dissipative Dynamics of Highly Anisotropic Systems Authors: Mauricio Martinez and Michael Strickland Categories: nucl-th hep-ph Comments: 17 pages, 5 figures; Published version Journal-ref: Nuclear Physics, Section A 848, 183 (2010) DOI: 10.1016/j.nuclphysa.2010.08.011 \\ ( http://arxiv.org/abs/1007.0889 , 73kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- For subscribe options to combined physics archives, e-mail To: physics@arXiv.org, Subject: subscribe ----------------------------------------------------------------------------- For help on viewing and making submissions, see http://arXiv.org/help/ For a list of archive mirror sites, see http://arXiv.org/servers.html ----------------------------------------------------------------------------- Third-party submissions cause excessive problems. 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