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DTSTART:20180627T110000Z
DTEND:20180627T123000Z
DTSTAMP:20190619T092253Z
CREATED:20180619T085923Z
LAST-MODIFIED:20180619T090708Z
UID:177-1530097200-1530102600@jacobi.fis.ucm.es
SUMMARY:Breno Giacchini
DESCRIPTION:Fecha y hora: Miércoles 27 de junio\, 15:00\nLugar: Seminario de Física Teórica 3º planta\n\n\nPonente: Breno L. Giacchini (CBPF\, Río de Janeiro)\n\nTítulo: Regularities in polynomial higher-derivative gravities.\n\nAbstract:\nIn this talk we present some results on regular solutions in linearized polynomial higher-derivative gravity models. In the first part we discuss the Newtonian limit and we show that\, even though fourth-order gravity still has curvature singularities\, any model with at least six derivatives in both spin-2 and spin-0 sectors is regular when coupled to a pointlike mass. In the second part of the talk we discuss the collapse of a small mass\, considered as a spherical superposition of gyratons. Similarly to the static case\, for models with more than four derivatives the Kretschmann scalar is regular during the collapse of a thick null shell. We also verify the existence of the mass gap for the formation of mini black holes even if complex and/or degenerate poles are allowed\, generalizing previous considerations on the subject and covering the case of Lee-Wick gravity. These interesting regularity properties of sixth- and higher-derivative models at the linear level reinforce the question of whether there can be nonsingular black holes in the full nonlinear model.\n\n\n
URL:http://jacobi.fis.ucm.es/wordpress/seminario/breno-giacchini/
LOCATION:Avenida Complutense\, Madrid\, Madrid\, 28011\, España
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