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On the gravitational and electrodynamical stability of nuclear matter cores. Michael rotondo* R. Ruffini*°^ S-S . Xue*° *Department of physics and Icra , University of rome “Sapienza” °Icranet , pescara ^Icranet , university of nice “ sophia antipolis” Third stueckelberg meeting - PowerPoint PPT Presentation
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MICHAEL ROTONDO*
R. RUFFINI*°^S-S. XUE*°
*DEPARTMENT OF PHYSICS AND ICRA, UNIVERSITY OF ROME “SAPIENZA”°ICRANET, PESCARA
^ICRANET,UNIVERSITY OF NICE “SOPHIA ANTIPOLIS”
THIRD STUECKELBERG MEETINGJULY 11 2008, PESCARA, ITALY
Some astrophysical open problems
The problem of the almost known equations of state for neutron stars which are not able to reproduce the observations in millisecond binary pulsars
The problem of explaining the energetics of the emission of the remnant during the collapse to a neutron star
The problem of formation of the supercritical fields during the collapse to a black hole
It is our opinion that the solution of these problems could find their natural explanation from a yet unexplored field : the electro-dynamical structure of a neutron star.
In this work we outline a few crucial ideas of how a Thomas-Fermi approach to neutron stars can indeed represent an important step in identify this crucial feature.
Conclusions
1- The requirement of beta decay equilibrium appears to be necessary for obtaining from first principles the phenomenological relations between A and Np adopted in superheavy nuclei.
2-The Thomas-Fermi equation is a good example of the possibility that collective effects of relativistic quantum statistics leads to electric fields in astrophysical situations with values much larger than the ones suggested by the test particle approximation.
3-The possibility of having stable massive cores describable based solely on gravitational, electromagnetic and weak interactions and relativistic quantum statistics opens a whole new scenario for the study of neutron star configurations close to their critical mass and the subsequent approach to process of gravitational collapse to a Kerr-Newman black hole.
References
[1] J. Ferreirinho, R. Ruffini, L. Stella, Phys. Lett. B 91, (1980) 442.
[2] R.Ruffini, M. Rotondo, S.S. Xue, Int. Journal of Modern Phys. D Vol. 16, No. 1 (2007) 1-9.
[3] A.B. Migdal, D.N. Voskresenskii, V.S. Popov, Sov. Phys. JETP 45 (3), (1977) 436.
[4] R.Rotondo, R. Ruffini, S.S.Xue, in the “Proceedings of the fourth Italian-Sino Workshop on Relativistic Astrophysics”, C.L. Bianco, S.S. Xue (eds.), AIP Conf. Proc. 966, 147 (2008).
[5] B. Patricelli, R.Rotondo, R. Ruffini, in the “Proceedings of the fourth Italian-Sino Workshop on Relativistic Astrophysics”, C.L. Bianco, S.S. Xue (eds.), AIP Conf. Proc. 966, 143 (2008).
[6] J. Madsen, Phys. Rev. Lett., Vol. 100, 151102 (2008).
[7] R.Ruffini, M. Rotondo, S.S. Xue , submitted to Phys. Rev. Lett. (2008).