Bulletin of the American Physical Society
2007 APS April Meeting
Volume 52, Number 3
Saturday–Tuesday, April 14–17, 2007; Jacksonville, Florida
Session B12: Physics of Extreme Gravitational Fields I |
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Sponsoring Units: GGR DAP Chair: Robert Jantzen, Villanova University Room: Hyatt Regency Jacksonville Riverfront City Terrace 8 |
Saturday, April 14, 2007 10:45AM - 11:15AM |
B12.00001: The physics of GRBs Invited Speaker: The fundamental role of recent astrophysical observations pertaining to GRBs are shown to promote a revival of fundamental issues in GRBs, in black hole physics and in relativistic quantum field theory. The possibility to observe for the first time the process of vacuum polarization at the energy scale of $10^{54}$ ergs is presented. The profound consequences of the results on the physics of neutron stars and on black hole electrodynamics are presented and discussed. Some new perspectives in relativistic quantum field theory are as well outlined. In collaboration with Maria Grazia Bernardini, Carlo Luciano Bianco, Donato Bini, Letizia Caito, Pascal Chardonnet, Maria Giovanna Dainotti, Federico Fraschetti, Andrea Geralico, Roberto Guida, Michael Rotondo, Gregory Vereshchagin, and She-Sheng Xue, ICRA, ICRANet and Dipartimento di Fisica - Universit\`a di Roma ``La Sapienza''. [Preview Abstract] |
Saturday, April 14, 2007 11:15AM - 11:27AM |
B12.00002: Connecting vectors and relativistic strains Donato Bini, Andrea Geralico The definition of relative accelerations and strains among a set of comoving particles is studied in connection with the geometric properties of the frame adapted to a ``fiducial observer.'' A relativistically complete and correct definition of strains is given taking into account the transport law of the chosen spatial triad along the observer's congruence. The celebrated idea of Szekeres' compass of inertia is then generalized, contributing also to the theory of relativistic gravity gradiometer. The observer-dependent form of our analysis might be very useful when thinking about general relativistic tests on space stations orbiting compact objects like black holes and also in other interesting gravitational situations. [Preview Abstract] |
Saturday, April 14, 2007 11:27AM - 11:39AM |
B12.00003: Scattering problems on rotating acoustic black holes Christian Cherubini, Simonetta Filippi Analog curved spacetimes emerging from non relativistic consensed matter systems can be very useful to understand General Relativistic effects. Scattering problems on rotating acoustic black holes in particular can be studied in the time domain by using numerical methods only. In order to obtain high quality results in simulations, tools developed by numerical relativists in the case of rotating Kerr black holes must be adopted, i.e. constrained evolution schemes for strongly symmetric and non symmetric hyperbolic systems of PDEs and excision techniques in horizon penetrating coordinates. In this talk such a program is presented and analogies between astrophysical and acoustic black holes are discussed in relation with Press and Teukolsky's relativistic ``black hole bomb.'' [Preview Abstract] |
Saturday, April 14, 2007 11:39AM - 11:51AM |
B12.00004: Classical and Quantum features of the spin-curvature coupling Francesco Cianfrani, Giovanni Montani We analyze the behavior of a spinning particle in gravity, both from a quantum and a classical perspective point of view. We infer that, since the interaction between the space-time curvature and a spinning test particle is expected, then the main features of such an interaction can get light on which degrees of freedom have physical meaning in a quantum gravity theory with fermions. Finally, the dimensional reduction of Papapetrou equations is performed in a 5-dimensional Kaluza-Klein background and Dixon-Souriau results for the motion of a charged spinning body are obtained. [Preview Abstract] |
Saturday, April 14, 2007 11:51AM - 12:03PM |
B12.00005: Generalized axisymmetric models of self-gravitating systems Simonetta Filippi, Christian Cherubini, Remo Ruffini, Alonso Sepulveda Non-homogeneous axisymmetric models of self-gravitating systems are discussed by using functional methods and integrability conditions are established in the case of barotropic and baroclinic configurations. For various velocity profiles, in the case of polytropic index n=1, analytic approaches are tempted by using the matching techinque developed by Williams in 1987 in order to find the density profile and in particular the configuration's surface. [Preview Abstract] |
Saturday, April 14, 2007 12:03PM - 12:15PM |
B12.00006: Perturbations of a Reissner-Nordstrom black hole by a charged massive particle at rest Andrea Geralico, Donato Bini, Remo Ruffini A new perturbative solution describing a two-body system consisting of a Reissner-Nordstrom black hole and a charged massive particle at rest is presented. The general properties of the perturbed metric, completely reconstructed analytically, are discussed. The perturbed electromagnetic field is also analyzed by plotting the associated lines of force. [Preview Abstract] |
Saturday, April 14, 2007 12:15PM - 12:27PM |
B12.00007: Lorentz gauge theory and its phenomenological implications Orchidea Maria Lecian, Giovanni Montani A gauge theory of the Lorentz group, based on the different behaviour of spinors and vectors under local space-time transformations, is formulated. The role of the torsion field within this gauge scheme is discussed and Lorentz connections are identified with suitable bein projections of the contortion field. Our approach predicts a propagating torsion field having the density spin current as a source, and, in this sense, provides an extension of the U$^4$ theory. An application of this theory to an accelerated beam of electrons is proposed; therefore, an upper limit to the Lorentz interaction coupling constant is discussed. [Preview Abstract] |
Saturday, April 14, 2007 12:27PM - 12:39PM |
B12.00008: Non-homogeneous axisymmetric models of self-gravitating systems: the numerical matching Alonso Sepulveda, Christian Cherubini, Simonetta Filippi, Remo Ruffini, Jorge Iv\'an Zuluaga Callejas Non homogeneous axisymmetric models of self-gravitating systems are discussed by using functional methods and numerical techinques. More in detail, in a reference frame, rotating with constant angular velocity Omega, a self-gravitating incompressible fluid, in steady state is considered. In particular the internal velocity field has flow lines normal to the global angular velocity. Deriving a generalized Lane-Emden equation and using a procedure inspired by the method of Eriguchi-Muller, for selected velocity profiles, a sequence of equilibrium configurations is found and discussed. [Preview Abstract] |
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