A theory of thin shells with orbiting constituents

The self-gravitating, spherically symmetric thin shells built of orbiting particles are sstudied. Two new features are found. One is the minimal possible value for an angular momentum of particles, above which elleptic orbits become possible. The second is the coexistence of both the wormhole solutions and the elleptic or hyperbolic orbits for the same values of the parameters (but different initial conditions). Possible applications of these results to astrophysics and quantum black holes are briefly discussed.Comment: 22 pages, Latex, 10 eps figures. CERN preprint no. CERN-TH 2000-16

Relativistic Laser-Matter Interaction and Relativistic Laboratory Astrophysics

The paper is devoted to the prospects of using the laser radiation interaction with plasmas in the laboratory relativistic astrophysics context. We discuss the dimensionless parameters characterizing the processes in the laser and astrophysical plasmas and emphasize a similarity between the laser and astrophysical plasmas in the ultrarelativistic energy limit. In particular, we address basic mechanisms of the charged particle acceleration, the collisionless shock wave and magnetic reconnection and vortex dynamics properties relevant to the problem of ultrarelativistic particle acceleration.Comment: 58 pages, 19 figure

Fizicheskie voprosy teorii zvezdno i evol i u t sii. English

2 v. : ill. ; 24 cm

Gamma-ray burst investigation via polarimetry and spectroscopy (GRIPS)

59The primary scientific goal of the GRIPS mission is to revolutionize our understanding of the early universe using gamma-ray bursts. We propose a new generation gamma-ray observatory capable of unprecedented spectroscopy over a wide range of gamma-ray energies (200 keV-50 MeV) and of polarimetry (200-1000 keV). The gamma-ray sensitivity to nuclear absorption features enables the measurement of column densities as high as 10(28)cm (-aEuro parts per thousand 2). Secondary goals achievable by this mission include direct measurements of all types of supernova interiors through gamma-rays from radioactive decays, nuclear astrophysics with massive stars and novae, and studies of particle acceleration near compact stars, interstellar shocks, and clusters of galaxies.nonenoneGreiner J.; Iyudin A.; Kanbach G.; Zoglauer A.; Diehl R.; Ryde F.; Hartmann D.; v. Kienlin A.; McBreen S.; Ajello M.; Bagoly Z.; Balasz L. G.; Barbiellini G.; Bellazini R.; Bezrukov L.; Bisikalo D. V.; Bisnovaty-Kogan G.; Boggs S.; Bykov A.; Cherepashuk A. M.; Chernenko A.; Collmar W.; DiCocco G.; Droege W.; Gierlik M.; Hanlon L.; Horvath I.; Hudec R.; Kiener J.; Labanti C.; Langer N.; Larsson S.; Lichti G.; Lipunov V. M.; Lubsandorgiev B. K.; Majczyna A.; Mannheim K.; Marcinkowski R.; Marisaldi M.; McBreen B.; Meszaros A.; Orlando E; Panasyuk M. I.; Pearce M.; Pian E.; Poleschuk R. V.; Pollo A.; Pozanenko A.; Savaglio S.; Shustov B.; Strong A.; Svertilov S.; Tatischeff V.; Uvarov J.; Varshalovich D. A.; Wunderer C. B.; Wrochna G.; Zabrodskij A. G.; Zeleny L. M.Greiner, J.; Iyudin, A.; Kanbach, G.; Zoglauer, A.; Diehl, R.; Ryde, F.; Hartmann, D.; v. Kienlin, A.; Mcbreen, S.; Ajello, M.; Bagoly, Z.; Balasz, L. G.; Barbiellini, G.; Bellazini, R.; Bezrukov, L.; Bisikalo, D. V.; Bisnovaty-Kogan, G.; Boggs, S.; Bykov, A.; Cherepashuk, A. M.; Chernenko, A.; Collmar, W.; Dicocco, G.; Droege, W.; Gierlik, M.; Hanlon, L.; Horvath, I.; Hudec, R.; Kiener, J.; Labanti, C.; Langer, N.; Larsson, S.; Lichti, G.; Lipunov, V. M.; Lubsandorgiev, B. K.; Majczyna, A.; Mannheim, K.; Marcinkowski, R.; Marisaldi, M.; Mcbreen, B.; Meszaros, A.; Orlando, E; Panasyuk, M. I.; Pearce, M.; Pian, E.; Poleschuk, R. V.; Pollo, A.; Pozanenko, A.; Savaglio, S.; Shustov, B.; Strong, A.; Svertilov, S.; Tatischeff, V.; Uvarov, J.; Varshalovich, D. A.; Wunderer, C. B.; Wrochna, G.; Zabrodskij, A. G.; Zeleny, L. M