Talk detail

Participant	Radu, Eugen
Institution	Aveiro University - Campus de Santiago - Aveiro - - Portugal

Session	BH7-8	Accepted		Order	Time
Talk	Oral abstract	Title	Black ringoids: new higher dimensional black objects with non-spherical horizon topology
Coauthors
Abstract	We discuss the properties of a new class of solutions of Einstein equations reported recently in the literature -- the black ringoids. These asymptotically flat black objects have an $S^{n+1} \times S^{2k+1}$ horizon topology, being supported against collapse by rotation, with $k+1$ equal magnitude angular momenta and no singularity on and outside the horizon. Based on the nonperturbative numerical results found for several values of $(n, k)$, we also propose a general picture for the properties and the phase diagram of these solutions and the associated black holes with spherical horizon topology.
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Session	AT4	Accepted		Order	Time
Talk	Oral abstract	Title	Vortons in General Relativity
Coauthors
Abstract	The vortons can be viewed as field theory analogues of black rings in general relativity, being spinning vortex loops stabilized by the centrifugal force. Moreover, it has been shown recently that thick vortons with small radius preserve their form in the 3 + 1 non-linear dynamical evolution. In this talk, we discuss the basic features of these objects when including the general relativity effects. For example, we find that gravity imposes an upper bound on the vortons mass and angular momentum. Moreover, the coupling to gravity gives rise to a spiral-like frequency dependence of the mass and charge. We also show that the vortons may contain a black hole in their center. Then the vortons are in synchronous rotation with the horizon, the resulting configuration describing a black hole surrounded by a vortex ring.
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