Preprints

1.     astro-ph/0212483 

Title: The theoretical model of a magnetic white dwarf
Authors: I. Bednarek, A. Brzezina, R. Manka, M. Zastawny-Kubica (University of Silesia, Poland)
Comments: 16 pages, latex2e, 3 figures, submitted to Astronomische Nachrichten

In this paper a theoretical model of a magnetic white dwarf is studied. All numerical calculations are performed under the assumption of a spherically symmetric star. The obtained equation of state is stiffer for the increasing value of magnetic field B. The numerical values of the maximum mass and radius are presented. Sensibility of the results to the choice of the magnetic field strength is evident. Finally the departure from the condition of isothermality of degenerated electron gas in gravitational field is discussed.

2.       nucl-th/0212065

Title: The extended, relativistic hyperon star model
Authors: I. Bednarek, M.Keska, R. Manka (University of Silesia, Poland)
Comments: 22 pages, revtex4, 13 figures

In this paper an equation of state of neutron star matter which includes strange baryons in the framework of Zimanyi and Moszkowski (ZM) model has been obtained. We concentrate on the effects of the isospin dependence of the equation of state constructing for the appropriate choices of parameters the hyperons star model. Numerous neutron star models show that the appearance of hyperons is connected with the increasing density in neutron star interiors. Various studies have indicated that the inclusion of delta meson mainly affects the symmetry energy and through this the chemical composition of a neutron star. As the effective nucleon mass contributes to hadron chemical potentials it alters the chemical composition of the star. In the result the obtained model of the star not only excludes large population of hadrons but also does not reduce significantly lepton contents in the star interior.

3.  nucl-th/0212056 

Title: The influence of asymmetry on a magnetized proto-neutron star
Authors: I. Bednarek, A. Brzezina, R. Manka, M. Zastawny-Kubica (University of Silesia, Poland)
Comments: 14 pages, latex2e (elsart), 4 figures, to appear in Nuclear Physics A

Using the Relativistic Mean Field Theory (RMF) it is shown that different proton fraction which is directly connected with the neutron excess and with the asymmetry of the system affects proto-neutron stars parameters and changes their composition. The obtained form of the equation of state allows to construct the mass-radius relations and shows that the increasing asymmetry creates more compact stars. The inclusion of delta meson together with nonlinear vector meson interaction terms and magnetic field make this effect even stronger.

4. nucl-th/0211030 

Title: A neutron star model in the nonlinear Relativistic Mean-Field Theory
Authors: Ilona Bednarek, Ryszard Manka (Uniwersity of Silesia, Poland)
Comments: 4 pages, 4 figures, Proceedings of the 17th Divisional Conference on Nuclear Physics in Astrophysics (NPDC17), 30th September-4th October 2002, ATOMKI, Debrecen, Hungary, to appear in Nuclear Physics A

The neutron star parameters in the RMF model extended by the inclusion of delta meson and additional nonlinear vector meson interactions are studied.

5. astro-ph/0202303 

Title: Effects of the magnetic fields on the protoneutron star structure
Authors: R. Manka, M. Zastawny-Kubica, A. Brzezina, I. Bednarek (University of Silesia, Poland)
Comments: 7 pages, latex2e, 3 figures, submitted to J. Phys. G: Nucl. Phys

6. nucl-th/0201003

Title: The quark strange star in the enlarged Nambu-Jona-Lasinio model
Authors: R. Manka, I. Bednarek, G.Przybyla (University of Silesia, Poland)
Comments: 23 pages, iop latex2e + hyperref, 11 figures, to appear in NJP
Journal-ref: New J.Phys. 4 (2002) 14

The strange quark star is investigated within the enlarged SU(3) Nambu-Jona-Lasinio (NJL). The stable quark star exists till maximal configutation with rho_m=3.1, 10^15, g/cm^3 with M_m=1.61, M_Sun and R_m=8.74, km is reached. Strange quarks appear for density above rho_c=9.84 10^14 g/cm^3 for the quark star with radius R_c=8.003 km and M_c=0.77, M_Sun. The comparison of a quark star properties obtained in the Quark Mean Field (QMF) approach to a neutron star model constructed within the Relativistic Mean Field (RMF) theory is presented.

7. astro-ph/0112512 

Title: Effects of the magnetic fields on the helium white dwarfs structure
Authors: R. Manka, M. Zastawny-Kubica, A. Brzezina, I. Bednarek (University of Silesia, Poland)
Comments: 20 pages, latex2e, 10 figures, submitted to Physica Script

8.  astro-ph/0012088

       Title: Protoneutron star in the Relativistic Mean - Field Theory

       Authors: R. Manka, M. Zastawny-Kubica, A. Brzezina, I. Bednarek (University of Silesia, Poland.)          Comments: 21 pages, iop latex2e, 18 colour figures, submitted to Journal of Physics G: Nuclear and        Particle

In this review the basic properties of nonrotating and slowly rotating protoneutron stars in the relativistic mean-field approach are discussed. The equation of state is the main input to the structure equations. The TM1 parameter set extended to the case of finite temperature is used to obtain the mass-radius relation for protoneutron stars. The occurrence of unstable areas in the mass-radius relation are presented. This allows for the existence of distinctively different evolutionary of tracks of the protoneutron stars. The low density protoneutron star configurations are estimated. The obtained stable configurations for the fixed lepton number Y_L=0.4 are compared with ones obtained for the fixed proton fraction Y_P=0.1776.

9. nucl-th/0012026

Title: Structure and properties of neutron stars in the Relativistic Mean - Field Theory

Authors: Ilona Bednarek, Ryszard Manka (University of Silesia, Poland) 

Comments: 18 pages, latex2e, 10 colour eps figures,

Journal-ref: Int.J.Mod.Phys. D10 (2001) 607-624

Properties of rotating neutron stars with the use of relativistic mean-field theory are considered. The performed analysis of neutron star matter is based on the nonlinear Lgrangian density. The presence of nonlinear interaction of vector mesons modifies the density dependence of the rho field and influences bulk parameters of neutron stars. The observed quasi-periodic X-ray oscillations of low mass X-ray binaries can be used in order to constrain the equation of state of neutron star matter. Having assumed that the maximum frequency of the quasi periodic oscillations originates at the circular orbit it is possible to estimate masses and radii of neutron stars.

10.  hep-ph/0011113

Title: Sphaleron in the Dilatonic Gauge Field Theory

11. nucl-th/0011084

Title: The nucleon and mesons effective masses in the Relativistic Mean-Field Theory

Nucleon and meson effective masses in the nonlinear Relativistic Mean - Field Theory (RMF) introducing a nonlinear omega - rho and sigma coupling motivated by the Quark Meson Coupling model (QMC) is explored. It is shown that, in contrast to the usual Walecka model, not only the effective nucleon mass m_{eff,N} but also the effective sigma, rho meson masses (m_{eff, sigma}, m_{eff, rho}) and the effective omega meson mass m_{eff, omega} are nucleon density dependent.

12.  nucl-th/0007071

Title: The quark star in the Quark Mean Field approach

13. hep-th/0005238

Title: Monopole in the dilatonic gauge field theory

A numerical study of coupled to the dilaton field, static, spherically symmetric monopole solutions inspired by the Kaluza-Klein theory with large extra dimensions are presented. The generalized Prasad-Sommerfield solution is obtained. We show that monopole may have also the dilaton cloud configurations.
 

14. astro-ph/0005116

Title: The neutrino star in the bulk Universe

15.  nucl-th/0001017

Title: The neutron star in the Relativistic Mean-Field Theory

16.  nucl-th/9912039

Title: The hot neutron star

17. gr-qc/9904027

Title: Vacuum structure for expanding geometry

18.  hep-th/9705134

Title: Double Universe

19.  hep-th/9612020

Title: Sphaleron in the dilatonic electroweak theory

20.  astro-ph/9608055

Title: The soliton stars evolution

The evolution of a soliton star filled with fermions is studied in the framework of general relativity. Such a system can be described by the surface tension $\sigma$, the bag constant $B$, and the fermion number density $\rho_{0}$. Usually one of these parameters prevails in the system and thus affects the spacetime inside the soliton. Whether it is described by Friedman or de Sitter metric depends on the prevailing parameter. The whole spacetime is devided by the surface of the soliton into the false vacuum region inside the soliton and the true vacuum region outside, the latter being described by the Schwarzschild line element. The aim of this paper is to study the equations of motion of the domain wall in two cases. In the first case the de Sitter metric describes the interior in the first case, and in the second case it is replaced by the Friedman metric. In both of them the Schwarzschild metric is outside the soliton. From the analysis of obtained equations one can draw conclusions concerning further evolution of a soliton star.

21.  astro-ph/9608053

Title: QCD deconfinement -- phase transitions and collapsing quark stars

22.  hep-th/9608037

Title: Baryogenesis and phase transition in the standard model

23.  hep-ph/9405305

Title: Phase Transition in Extended Electroweak Theory

24.  astro-ph/9309025

Title: Astrophysical aspects of fermion number violation in the supersymmetrical standard model

25.  astro-ph/9304007

 The Neutrino Ball Model of a Quasar

26.  

Authors: M. Biesiada, R.Manka, J.Syska

Title: A New Static spherically symmetric solution in the six-dimmension dilatonic Kaluza-Klein theory 

Journal-ref: International Journal of Modern Physics D. Vol.9, No1, (2000), 71-78.

27.
Ilona Bednarek Ryszard Mańka
Phase Transitions in the  Soliton Star Model, 1997,