BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Accelerating Universes in String Theory via Field Redefinition - O
 hta\, N (Kinki University)
DTSTART:20120626T131500Z
DTEND:20120626T133000Z
UID:TALK38651@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:We study cosmological solutions in the effective heterotic str
 ing theory with lpha'-correction terms in string frame. It is pointed out
  that the effective theory has an ambiguity via field redefinition and we 
 analyze generalized effective theories due to this ambiguity. We restrict 
 our analysis to the effective theories which give equations of motion of s
 econd order in the derivatives\, just as ``Galileon" field theory. This cl
 ass of effective actions contains two free coupling constants. We find de 
 Sitter solutions as well as the power-law expanding universes in our four-
 dimensional Einstein frame. The accelerated expanding universes are always
  the attractors in the present dynamical system. \n
LOCATION:Seminar Room 2\, Newton Institute Gatehouse
END:VEVENT
END:VCALENDAR