Speaker
Anna Kostouki
(King's College London)
Description
Applying a novel non-perturbative functional method framework to a
two-dimensional bosonic sigma model with tachyon, dilaton and graviton
backgrounds we construct exact (non perturbative in alpha') inflationary
solutions, consistent with world-sheet Weyl Invariance. The mechanism
for inflation entails a (partial) "alignment" between tachyon and
dilaton backgrounds in the solution space, in a way to be explained in
detail in the talk. Some speculative remarks as to how one can exit from
the inflationary phase, as well as possible scenarios for reheating based
on string creation at the end of inflation, may also be presented, if
time allows. The advantage of our method is that the solutions are valid
directly in four target-space-time dimensions, as a result of the non
trivial dilaton configurations. Whether the model is phenomenologically
realistic, with respect to its particle physics aspects, remains an open
issue.
Author
Anna Kostouki
(King's College London)
