Mass Ejection by Strange Star Mergers and Observational Implications (2008)
Bauswein, A., Janka, H. -Th., Oechslin, R., Pagliara, G., Sagert, I., Schaffner-Bielich, J., ...
We determine the Galactic production rate of strangelets as a canonical input to calculations of the measurable cosmic ray flux of strangelets by performing simulations of strange star mergers and...
The Quest for the Nuclear Equation of State (2008)
Aichelin, J., Schaffner-Bielich, J.
The present status of the efforts to determine the nuclear equation of state from results of heavy ion reactions and from astrophysical observations is reviewed
Signals of the QCD phase transition in core-collapse supernovae (2008)
Sagert, I., Hempel, M., Pagliara, G., Schaffner-Bielich, J., Fischer, T., Mezzacappa, A., ...
We explore the implications of the QCD phase transition during the postbounce evolution of core-collapse supernovae. Using the MIT bag model for the description of quark matter and assuming small bag...
Neutron stars within the SU(2) parity doublet model (2008)
Dexheimer, V., Pagliara, G., Tolos, L., Schaffner-Bielich, J., Schramm, S.
The equation of state of beta-stable and charge neutral nucleonic matter is computed within the SU(2) parity doublet model in mean field and in the relativistic Hartree approximation. The mass of the...
Stability of CFL cores in Hybrid Stars (2007)
Pagliara, G., Schaffner-Bielich, J.
We study the equation state of strongly interacting quark matter within a NJL-like model in which the chiral condensates and the color superconducting gaps are computed self-consistently as a...
Signals of the QCD Phase Transition in the Heavens (2007)
The modern phase diagram of strongly interacting matter reveals a rich structure at high-densities due to phase transitions related to the chiral symmetry of quantum chromodynamics (QCD) and the...
Pulsar kicks by anisotropic neutrino emission from quark matter in strong magnetic fields (2007)
Sagert, I., Schaffner-Bielich, J.
We discuss a pulsar acceleration mechanism based on asymmetric neutrino emission from the direct quark Urca process in the interior of proto neutron stars. The anisotropy is caused by a strong...
Cosmology of fermionic dark matter (2007)
Boeckel, T., Schaffner-Bielich, J.
We explore a model for a fermionic dark matter particle family which decouples from the rest of the partices when at least all standard model particles are in equilibrium. We calculate the allowed...
Pulsar kicks by anisotropic neutrino emission from quark matter (2007)
Sagert, I., Schaffner-Bielich, J.
We discuss an acceleration mechanism for pulsars out of their supernova remnants based on asymmetric neutrino emission from quark matter in the presence of a strong magnetic field. The polarized...
Formation of Quark Phases in compact stars and their connection to Gamma-Ray-Bursts (2007)
Drago, A., Pagliara, G., Schaffner-Bielich, J.
We analyse the occurrence of quiescent times in the temporal structure of the Gamma-Ray-Bursts (GRBs) light curves. We show that if a long quiescent time is present, it is possible to divide the...
Triaxial nuclear models and the outer crust of nonaccreting cold neutron stars (2007)
Guo, Lu, Hempel, M., Schaffner-Bielich, J., Maruhn, J. A.
The properties and composition of the outer crust of nonaccreting cold neutron stars are studied by applying the model of Baym, Pethick, and Sutherland (BPS) and taking into account for the first...
Hypernuclear Physics and Compact Stars (2007)
Hypernuclear physics plays a decisive role for several features of compact star physics. I review the impact of hypernuclear potential depths, two-body hyperon-nucleon and hyperon three-body forces...
Asymmetric neutrino emission in quark matter and pulsar kicks (2006)
Sagert, I., Schaffner-Bielich, J.
The puzzling phenomenon of pulsar kicks, i.e. the observed large escape velocities of pulsars out of supernova remnants, is examined for compact stars with a strange quark matter core. The direct...
Neutron stars and quark stars: Two coexisting families of compact stars? (2006)
The mass-radius relation of compact stars is discussed with relation to the presence of quark matter in the core. The existence of a new family of compact stars with quark matter besides white dwarfs...
In-medium properties of D-mesons at FAIR (2006)
Tolos, L., Schaffner-Bielich, J., Stoecker, H.
We obtain the D-meson spectral density at finite temperature for the conditions of density and temperature expected at FAIR. We perform a self-consistent coupled-channel calculation taking, as a bare...
D-mesons: In-medium effects at FAIR (2005)
Tolos, L., Schaffner-Bielich, J., Stoecker, H.
The $D$-meson spectral density at finite temperature is obtained within a self-consistent coupled-channel approach. For the bare meson-baryon interaction, a separable potential is taken, whose...
D-mesons in dense nuclear matter (2005)
Tolos, L., Schaffner-Bielich, J., Mishra, A.
The D-meson properties in dense nuclear matter are studied. The D-meson spectral density is obtained within the framework of a coupled-channel self-consistent calculation assuming, as bare...
What is so special about strangeness in hot matter? (2004)
The production of strange particles in a hot medium as produced in collisions of heavy ions is considered one of the most important signals for the phase transition to a quark-gluon plasma. In the...
In-medium properties of antikaons at finite temperature: the K^-/K^+ ratio at GSI (2004)
Tolos, L., Schaffner-Bielich, J., Polls, A., Ramos, A.
The $K^-/K^+$ ratio in heavy-ion collisions at GSI is studied including the properties of the participating hadrons in hot and dense matter, paying a particular attention to the in-medium properties...
Properties of D-mesons in nuclear matter within a self-consistent coupled-channel approach (2004)
Tolos, L., Schaffner-Bielich, J., Mishra, A.
The spectral density of the $D$-meson in the nuclear environment is studied within a self-consistent coupled-channel approach assuming a separable potential for the bare meson-baryon interaction. The...
Structure of Stars and Nuclei (2004)
The properties of dense hadronic and quark matter and its relation to compact stars are discussed. In a bottom-up approach one starts with nuclear and hypernuclear physics at low density and...
Kaons and antikaons in hot and dense hadronic matter (2004)
Mishra, A., Bratkovskaya, E. L., Schaffner-Bielich, J., Schramm, S., Stoecker, H.
The medium modification of kaon and antikaon masses, compatible with low energy KN scattering data, are studied in a chiral SU(3) model. The mutual interactions with baryons in hot hadronic matter...
In-medium effects on the $K^-/K^+$ ratio at GSI (2003)
Tolos, L., Polls, A., Ramos, A., Schaffner-Bielich, J.
The in-medium modifications on the $K^-/K^+$ ratio produced at GSI are studied. Particular attention is paid to the properties of antikaons, which determine the chemical potential and temperature at...
Mass modification of D-meson in hot hadronic matter (2003)
Mishra, A., Bratkovskaya, E. L., Schaffner-Bielich, J., Schramm, S., Stöcker, H.
We evaluate the in-medium $D$ and $\bar D$-meson masses in hot hadronic matter induced by interactions with the light hadron sector described in a chiral SU(3) model. The effective Lagrangian...
K^-/K^+ ratio at GSI in hot and dense matter (2003)
Tolos, L., Polls, A., Ramos, A., Schaffner-Bielich, J.
The $K^-/K^+$ ratio in heavy-ion collisions at GSI energies is studied including the properties of the participating hadrons in hot and dense matter. The determination of the temperature and chemical...
Dilute Nuclear Matter in Chiral Perturbation Theory (2003)
Fraga, E. S., Hatta, Y., Pisarski, R. D., Schaffner-Bielich, J.
We use chiral perturbation theory to compute the effective nucleon propagator in an expansion about low density in the chiral limit. We neglect four-nucleon interactions and focus on pion exchange....
The Equation of State for Cold and Dense Strongly Interacting Matter (2003)
Fraga, E. S., Hatta, Y., Pisarski, R. D., Schaffner-Bielich, J.
We discuss recent results for the equation of state for cold and dense strongly interacting matter. We consider the extreme cases of very high densities, where weak-coupling approaches may in...
Particle ratios at RHIC: Effective hadron masses and chemical freeze-out (2002)
Zschiesche, D., Schramm, S., Schaffner-Bielich, J., Stoecker, H., Greiner, W.
The measured particle ratios in central heavy-ion collisions at RHIC-BNL are investigated within a chemical and thermal equilibrium chiral SU(3) \sigma-\omega approach. The commonly adopted...
Effect of in-medium properties on heavy-ion collisions (2000)
The properties of strange hadrons, i.e. of kaons and hyperons, in the nuclear medium are discussed in connection with neutron star properties and relativistic heavy-ion collisions. Firstly, the...
Critical Review Of Quark Gluon Plasma Signals (2000)
Zschiesche, D., Gerland, L., Schramm, S., Schaffner-Bielich, J., Stoecker, H., Greiner, W.
Compelling evidence for a new form of matter has been claimed to be formed in Pb+Pb collisions at SPS. We critically review two suggested signatures for this new state of matter: First the...
Properties of Strange Hadronic Matter in Bulk and in Finite Systems (2000)
Schaffner-Bielich, J., Gal, A.
The hyperon-hyperon potentials due to a recent SU(3) Nijmegen soft-core potential model are incorporated within a relativistic mean field calculation of strange hadronic matter. We find considerably...
Lenaghan, J. T., Rischke, D. H., Schaffner-Bielich, J.
We study patterns of chiral symmetry breaking at zero temperature and its subsequent restoration at nonzero temperature within the $SU(3)_{r} \times SU(3)_{\ell}$ linear sigma model. Gap equations...
Hadrons in Dense Resonance-Matter: A Chiral SU(3) Approach (2000)
Zschiesche, D., Papazoglou, P., Schramm, S., Schaffner-Bielich, J., Stoecker, H., Greiner, W.
A nonlinear chiral SU(3) approach including the spin 3/2 decuplet is developed to describe dense matter. The coupling constants of the baryon resonances to the scalar mesons are determined from the...
Schertler, K, Greiner, C, Schaffner-Bielich, J, Thoma, M H
The appearance of quark phases in the dense interior of neutron stars provides one possibility to soften the equation of state (EOS) of neutron star matter at high densities. This softening leads to...
Schertler, K., Greiner, C., Schaffner-Bielich, J., Thoma, M. H.
The appearance of quark phases in the dense interior of neutron stars provides one possibility to soften the equation of state (EOS) of neutron star matter at high densities. This softening leads to...
Chiral model for dense, hot and strange hadronic matter (1999)
Zschiesche, D., Papazoglou, P., Beckmann, Ch. W., Schramm, S., Schaffner-Bielich, J., Stocker, H., ...
An extended chiral SU(3) model is applied to the description of dense, hot and strange hadronic matter. The degrees of freedom are the baryon octet and decuplet and the spin-0 and spin-1 meson...
Schaffner-Bielich, J., Mattiello, R., Sorge, H.
Weak SU(3) symmetry is successfully applied to the weak hadronic decay amplitudes of octet hyperons. Weak nonmesonic and mesonic decays of various dibaryons with strangeness, their dominant decay...
Schaffner-Bielich, J., Koch, V., Effenberger, M.
The medium modifications of antikaons in dense matter are studied in a coupled channel calculation for scenarios more closely related to the environment encountered in heavy-ion collisions. We find...
Last Call for RHIC Predictions (1999)
Bass, S., Bleicher, M., Cassing, W., Dumitru, A., Drescher, H. J., Eskola, K., ...
This paper contains the individual contributions of all speakers of the session on 'Last Call for RHIC Predictions' at Quark Matter 99, and a summary by the convenor.
Effective Restoration of the U_A(1) symmetry in the SU(3) linear sigma model (1999)
The effective restoration of the chiral U(A)(1) symmetry in strong interactions is studied using the linear chiral SU(3)xSU(3) model at finite temperatures. We find that the disappearance of the...
Neutron stars and quark phases in the NJL model (1999)
Schertler, K., Leupold, S., Schaffner-Bielich, J.
We study the possible existence of deconfined quark matter in the interior of neutron stars using the Nambu-Jona-Lasinio model to describe the quark phase. We find that typical neutron stars with...
DCC dynamics with the SU(3) linear sigma model (1998)
Schaffner-Bielich, J., Randrup, J.
The SU(3) extension of the linear sigma model is employed to elucidate the effect of including strangeness on the formation of disoriented chiral condensates. By means of a Hartree factorization,...
Nuclei in a chiral SU(3) model (1998)
Papazoglou, P., Zschiesche, D., Schramm, S., Schaffner-Bielich, J., Stocker, H., Greiner, W.
Nuclei can be described satisfactorily in a nonlinear chiral SU(3)-framework, even with standard potentials of the linear $\sigma$-model. The condensate value of the strange scalar meson is found to...
Schaffner-Bielich, J., Vischer, A. P.
We discuss the possibility, that multiply charmed exotics are produced in ultrarelativistic heavy ion collisions. Production probabilities at RHIC are estimated and found to be large enough to allow...
Chiral Lagrangian for strange hadronic matter (1997)
Papazoglou, P., Schramm, S., Schaffner-Bielich, J., Stöcker, H., Greiner, W.
A generalized Lagrangian for the description of hadronic matter based on the linear $SU(3)_L \times SU(3)_R$ $\sigma$-model is proposed. Besides the baryon octet, the spin-0 and spin-1 nonets, a...