BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Jean-Luc Lehners (Postdam\, MPI) DTSTART:20221019T140000Z DTEND:20221019T150000Z DTSTAMP:20260423T052502Z UID:AnLy/15 DESCRIPTION:Title: Ho w to create universes with internal flux\nby Jean-Luc Lehners (Postdam \, MPI) as part of AnLy Strings and Fields online seminars\n\n\nAbstract\n String compactifications typically require fluxes\, for example in order t o stabilise moduli. Such fluxes\, when they thread internal dimensions\, a re topological in nature and take on quantised values. This poses the puzz le as to how they could arise in the early universe\, as they cannot be tu rned on incrementally. Working with string inspired models in 6 and 8 dime nsions\, we show that there exist no-boundary solutions in which internal fluxes are present from the creation of the universe onwards. The no-bound ary proposal can thus explain the origin of fluxes in a Kaluza-Klein conte xt. In fact\, it acts as a selection principle since no-boundary solutions are only found to exist when the fluxes have the right magnitude to lead to an effective potential that is positive and flat enough for accelerated expansion. Within the range of selected fluxes\, the no-boundary wave fun ction assigns higher probability to smaller values of flux. Our models ill ustrate how cosmology can act as a filter on a landscape of possible highe r-dimensional solutions.\n LOCATION:https://researchseminars.org/talk/AnLy/15/ END:VEVENT END:VCALENDAR