Polygonal Gravity Seminars
January 28 | 11:30 - 16:30
Madrid’s Polygonal Gravity Seminar Series
Wednesday, January 28th. Red Room (IFT)
11:00 Welcome coffee
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11:30h First talk
Speaker: Robie Hennigar (U. Durham, UK)
Title: Building Regular Black Holes
Abstract: The study of regular (singularity-free) black holes has a long
history, but progress has been limited by the absence of a dynamical
framework in which they form and by conceptual issues at the kinematical
level. In this talk I will discuss recent work in which spherically
symmetric regular black holes emerge as unique solutions of gravity
theories with infinite towers of higher-curvature corrections, enabling
explicit analyses of their formation and dynamics. I will review the
construction, summarize key results, and highlight open problems.
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12:45-15:00 Lunch break
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15:00h Second talk
Speaker: Pablo Cano (U. Murcia)
Title: Amplification of new physics in the quasinormal mode spectrum of
highly-rotating black holes
Abstract: The computation of quasinormal modes of rotating black holes in
modified theories of gravity has been recently made possible thanks to the
development of new techniques, like a modified Teukolsky equation and
spectral methods. However, no method so far has been able to peek into the
highly rotating regime — close to extremality. In this talk, I will
consider a newly identified higher-curvature modification of GR that
preserves the isospectrality of quasinormal modes in the eikonal limit. In
this theory, eikonal perturbations can be described in terms of an
effective scalar equation, and solving it we will obtain the corrections
to the eikonal Kerr quasinormal modes for arbitrary rotation. For moderate
rotation, we check that the eikonal computation gives a good approximation
to the exact QNMs obtained from the modified Teukolsky equation, even for
low harmonics. For high rotation, we discover that the corrections to GR
become much larger and can lead to dramatic effects. Our results suggest
that the observation of the ringdown of a highly rotating black hole would
be a “golden event” to search for new physics.
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16:15 Farewell coffee
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