BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Black holes with primary hair DTSTART:20260521T143000Z DTEND:20260521T160000Z DTSTAMP:20260810T103741Z UID:6c810ff3-2f90-4113-9167-1ab29653afa3 SEQUENCE:2 CREATED:20260519T131802Z DESCRIPTION:General Relativity black holes are described by mass\, angular momentum and electric/magnetic charge. They are said to have no hair in t he sense that they are uniquely defined by these charges as measured from a far away observer and not by other details. These characteristics are th ought to persist in modified theories of gravity by so called no hair theo rems. We will see how one can bifurcate the no hair paradigm and construct explicit black hole solutions that admit additional independent charges i n theories modifying general relativity. These black holes have additional properties that make them quite different from their GR solutions. We wil l give two different classes of theories with two different explicit examp les and their properties. One originates from DHOST theories with scalar p rimary hair and one from vector tensor with Proca primary hair. The latter admits a cosmological constant as a free integration constant. LAST-MODIFIED:20260519T131811Z LOCATION:DF Seminar Room (2-8.3)\, 2nd floor of Physics Building URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/black-holes-with-primary-h air/ X-ALT-DESC;FMTTYPE=text/html:

General Relativity black holes are described by mass\, angular momentum and electric/magnetic charge. They are said to have no hair in the sense that they are uniquely defined by these charges as measured from a far away observer and not by other details. These characteristics are thought to persist in modified th eories of gravity by so called no hair theorems.

We will see how one can bifurcate the no hair paradigm and construct explicit black hole solutions that admit additional independent charges in theories modifying general relativity. These black holes have additional properties that make them quite different from their GR solutions.

We will give two different classes of theories with two different explicit examples and the ir properties. One originates from DHOST theories with scalar primary hair and one from vector tensor with Proca primary hair. The latter admits a c osmological constant as a free integration constant.

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