Talk detail

Participant	Kubiznak, David
Institution	Perimeter Institute - 31 Caroline St. N. - Waterloo - Ontario - Canada

Session	BH5	Accepted		Order	Time
Talk	Oral abstract	Title	Thermodynamic Volume And Phase Transitions Of AdS Black Holes
Coauthors
Abstract	I describe a new perspective on black hole thermodynamics, one that identifies the cosmological constant with thermodynamic pressure and its conjugate quantity with thermodynamic volume. This leads to an understanding of black holes from the viewpoint of chemistry, in terms of concepts such as Van der Waals fluids, reentrant phase transitions, and triple points. Both charged and rotating black holes exhibit novel chemical-type phase behaviour, hitherto unseen.
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Session	BH7-8	Accepted		Order	Time
Talk	Oral abstract	Title	Super-Entropic Black Holes
Coauthors
Abstract	We construct a new class of rotating AdS black hole solutions in four and higher dimensions that have non-compact horizons with topology of a sphere with two punctures and finite horizon area. We find that their entropy exceeds the maximum implied from the conjectured reverse isoperimetric inequality, which states that for a given thermodynamic volume, the black hole entropy is maximized for Schwarzschild-AdS. Such black holes are hence super-entropic.
Pdf file

Session	BH7-8	Accepted		Order	Time
Talk	Oral abstract	Title	Higgs hair of a rotating black hole
Coauthors
Abstract	A Kerr black hole sporting cosmic string hair is studied in the context of the abelian Higgs model vortex. It is shown that such a system displays much richer phenomenology than its static Schwarzschild or Reissner-Nordstrom cousins, for example, the rotation generates a near horizon electric field. In the case of an extremal rotating black hole, two phases of the Higgs hair are possible: large black holes exhibit standard hair, with the vortex piercing the event horizon. Small black holes on the other hand, exhibit a flux-expelled solution, with the gauge and scalar field remaining identically in their false vacuum state on the event horizon. Interestingly, backreaction of the Higgs vortex on the Kerr geometry cannot be described as a mere conical deficit as expected in many studies.
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