Talk detail

Participant	Stuchlik, Zdenek
Institution	Silesian University in Opava - Bezrucovo nam. 13 - Opava - Czech republic - Czech Republic

Session	BH3	Accepted		Order	Time
Talk	Oral abstract	Title	Ultra-high energy collisions in the superspinning Kerr geometry
Co-authors
Abstract	Kerr naked singularities (superspinars) have to be efficiently converted to a black hole due to accretion from Keplerian discs. Such superspinning geometries can serve as an efficient accelerator for extremely high-energy collisions enabling direct demonstration of the outcomes of the collision processes. We discuss the efficiency and visibility of the ultra-high energy collisions in the deepest parts of the gravitational well of superspinning near-extreme Kerr geometries for the whole variety of particles freely falling from infinity. The ultra high-energy processes can be obtained with no fine tuning of the motion constants and the products of the collision can escape to infinity with efficiency higher than in the case of the near-extreme black holes. The strongest efficiency of the collision process is reached for particles falling along purely radial trajectories.

Session	AN1	Accepted		Order	Time
Talk	Oral abstract	Title	The cosmological constant and the motion of Magellanic Clouds in the gravitational field of Milky Way
Co-authors
Abstract	Using the pseudo-Newtonian (PN) potential, we estimate the influence of the repulsive cosmological constant Λ ~ 1.3 × 10-56cm-2 implied by recent cosmological tests onto the motion of both Small and Large Magellanic Clouds (SMC and LMC) in the gravitational field of the Milky Way. The role of the cosmological constant is most conspicuous when binding mass is estimated for the satellite galaxies. We have found a strong influence of cosmic repulsion on the total binding mass for both galaxies. We have found that in some cases, the effect of the cosmic repulsion can be even comparable to the effects of the dynamical friction and the Andromeda Galaxy.