Dr. Lorenzo
Sorbo
Title: Moduli Entrapment with Primordial Black Holes
Moduli Stabilization
represents a crucial issue in the construction of string-theoretical models.
Even when the moduli potential has some nontrivial
local minimum, in general cosmological evolution is not expected to bring the
system there: moduli will rapidly roll along their
potential and overshoot the minimum, opening new large dimensions and
preventing inflation from starting. I will discuss how primordial black holes
can provide a resolution to this problem. When the Universe is created near the
Planck scale, all the available states, including electrically and magnetically
charged black holes, are excited. This gas quickly captures the moduli which appear in the relation between black hole
masses and charges, preventing them from rolling away. As the black holes redshift away, moduli gently
placed into a local minimum, and inflation may start.