BEGIN:VCALENDAR
VERSION:2.0
PRODID:researchseminars.org
CALSCALE:GREGORIAN
X-WR-CALNAME:researchseminars.org
BEGIN:VEVENT
SUMMARY:Tomas Ortin (Madrid IFT)
DTSTART:20200807T123000Z
DTEND:20200807T133000Z
DTSTAMP:20260423T035611Z
UID:EGSS/14
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/EGSS/14/">Co
 mpactification\, duality and black-hole entropy in stringy black  hole</a>
 \nby Tomas Ortin (Madrid IFT) as part of Exceptional geometry seminar seri
 es\n\n\nAbstract\nIn this talk I will review results obtained by our group
  over the last few years concerning the calculation of alpha' corrections 
 of 4- and 5-dimensional stringy black-hole geometries and the computation 
 of their Wald entropies\, always in the context of the Heterotic Superstri
 ng effective action.\n\nFirst\, I will describe the corrections to that ac
 tion in the Bergshoeff-de Roo formalism and how we can compute the corresp
 onding corrections to the simplest 5- and 4-dimensional (3- and 4-charge) 
 stringy black holes.\n\nThen\, I will comment on the problems surrounding 
 the application of the Iyer-Wald prescription to the calculation of the Wa
 ld entropy of those black holes directly in terms of their 10-dimensional 
 oxidized counterparts and I will argue that the calculation has to be done
  using the 4- and 5-dimensional actions.\n\nI will then show how to obtain
  these actions by direct dimensional reduction and how they provide us wit
 h alpha'-corrected T-duality rules. I will derive duality invariant Wald e
 ntropy formulas using the Iyer-Wald prescription and I will show that the 
 entropies obtained satisfy the expected properties.\n\nFinally\, I will co
 mment on the many unresolved problems related to all these issues.\n
LOCATION:https://researchseminars.org/talk/EGSS/14/
END:VEVENT
END:VCALENDAR