Bulletin of the American Physical Society
2007 APS April Meeting
Volume 52, Number 3
Saturday–Tuesday, April 14–17, 2007; Jacksonville, Florida
Session C11: Physics of Extreme Gravitational Fields II |
Hide Abstracts |
Sponsoring Units: DAP GGR Chair: Abe Falcone, Penn State University Room: Hyatt Regency Jacksonville Riverfront City Terrace 7 |
Saturday, April 14, 2007 1:30PM - 2:00PM |
C11.00001: Theoretical interpretation of GRB060614 Invited Speaker: GRB060614 is examined within our theoretical framework. This burst displays unusually an hard-multipeaked emission followed by an extended soft one. The most interesting peculiarity of this source is that, although it lasts about one hundred seconds and its redshift is very low (0.125), there is no evidence of an associated supernova explosion. In collaboration with Maria Grazia Bernardini, Letizia Caito, Maria Giovanna Dainotti, Roberto Guida, and Remo Ruffini, ICRANet and Dipartimento di Fisica - Universit\`a di Roma ``La Sapienza''. [Preview Abstract] |
Saturday, April 14, 2007 2:00PM - 2:12PM |
C11.00002: GRB970228: a prototype for a new GRB class Maria Grazia Bernardini, Carlo Luciano Bianco, Letizia Caito, Maria Giovanna Dainotti, Roberto Guida, Remo Ruffini GRB970228 has been analyzed within our theoretical framework as a prototype for a new class of GRBs, characterized by ``hybrid'' properties between short and long GRBs. Detailed theoretical computation of the GRB970228 light curves in selected energy bands as well as of the instantaneous and time-integrated spectra are presented and compared with observational BeppoSAX data. [Preview Abstract] |
Saturday, April 14, 2007 2:12PM - 2:24PM |
C11.00003: Theoretical interpretation of GRB011121 Letizia Caito, Maria Grazia Bernardini, Carlo Luciano Bianco, Maria Giovanna Dainotti, Roberto Guida, Remo Ruffini The most recent developments in Gamma-Ray Burst's (GRB) observations have imposed as a characteristic of strong interest the presence of some flares in the afterglow of many GRB sources. The explanation of these bumps in the light curves is a very important issue to resolve for the understanding of the GRB phenomenon. In this work, GRB011121 is analyzed as a prototipe to understand the flares recently observed by Swift. Detailed theoretical computations of the GRB011121 light curves in selected energy bands are presented and compared with observational BeppoSAX data. [Preview Abstract] |
Saturday, April 14, 2007 2:24PM - 2:36PM |
C11.00004: GRB060218: another example of GRB-Supernova connection Maria Giovanna Dainotti, Maria Grazia Bernardini, Carlo Luciano Bianco, Letizia Caito, Roberto Guida, Remo Ruffini We study the Gamma-Ray Burst (GRB) 060218 related to SN 2006aj. This source appears to be a very soft burst, therefore interpreted as an X-Ray Flash (XRF). We successfully fit the entire set of X- and gamma-ray observations by Swift of GRB 060218 in the 0.3-150 keV energy band during the entire time of observations within a unified theoretical model. We make as well definite predictions about the spectral distribution in the early part of the light curve. By our fit we show that there are no basic differences between XRFs and more general GRBs. [Preview Abstract] |
Saturday, April 14, 2007 2:36PM - 2:48PM |
C11.00005: The Amati relation and the atypical case of GRB980425 Roberto Guida, Maria Grazia Bernardini, Carlo Luciano Bianco, Letizia Caito, Maria Giovanna Dainotti, Remo Ruffini The existence of the phenomenological Amati relation is discussed within our theoretical GRB model. In this framework we perform a reanalysis of GRB980425, the only clear long GRB which does not follow such relation. Possible reasons for its peculiar behavior are discussed. [Preview Abstract] |
Saturday, April 14, 2007 2:48PM - 3:00PM |
C11.00006: Electrodynamics for neutron stars: generalized analytical solutions Michael Rotondo, Vladimir Popov, Remo Ruffini, She-Sheng Xue The relativistic Thomas-Fermi equation and energetic equation of beta equilibrium are used to describe degenerate neutrons, protons and electrons in neutron stars. The analytical approach is adopted to found equilibrium configurations which obey the global neutrality. Several generalized exact solutions are presented and discussed. [Preview Abstract] |
Saturday, April 14, 2007 3:00PM - 3:12PM |
C11.00007: On vacuum polarization and plasma oscillations Gregory Vereshchagin, Remo Ruffini, She-Sheng Xue Vacuum polarization in a strong electric field results in electron-positron pair creation. We study collective effects in the pair plasma emerged in this way, including vacuum polarization itself, back-reaction of the plasma on initial electric field and plasma oscillations. With this goal we consider energy conservation and electromagnetic field equations, comparing these to the traditional Vlasov-Boltzmann treatment. We conclude that under certain conditions plasma oscillations may occur in a weak electric field. We present single equation describing these oscillations in the weak field limit. Time and length scales of oscillations are discussed. [Preview Abstract] |
Saturday, April 14, 2007 3:12PM - 3:24PM |
C11.00008: Energetically favorable electrodynamical configuration for neutron stars She-Sheng Xue, Vladimir Popov, Michael Rotondo, Remo Ruffini We use the relativistic Thomas Fermi equation and energetic equation of beta equilibrium to describe degenerate neutrons, protons and electrons in neutron stars. An analytical approach are adopted to analyze these equations, implemented with the global neutrality: total proton and electron numbers are the same. We find a unique configuration of protons and electrons distributions which has an critical electric field at the surface of neutron stars. It is shown that such an electrodynamic configuration is (i) energetically stable against the Coulomb repulsion; and (ii) energetically favorable, against the configuration which obeys the local neutrality: proton and electron number-densities are the same in neutron stars. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700