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PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-5084
DTSTART:20190405T190000Z
DTEND:20190405T201500Z
DTSTAMP:20260415T090903Z
LAST-MODIFIED:20190331T051516Z
LOCATION:5280 Chamberlin Hall
SUMMARY:Large Field Ranges from Aligned and Misaligned Winding\, Theor
 y Seminar (High Energy/Cosmology)\, Andreas Schachner\, Heidelberg Uni
 versity
DESCRIPTION:One of the most prominent aspects of the landscape-swampla
 nd program is the quest for large field ranges in string compactificat
 ions. One reason for this is the interest in large-field inflation. An
 other is the hope for a deeper understanding of general quantum gravit
 y constraints and therefore of quantum gravity itself. In the present 
 talk\, I focus on large axionic field ranges summarizing work done in 
 collaboration with A. Hebecker and D. Junghans (arXiv: 1812.05626). Mo
 re specifically\, I explain our attempt to construct effective axions 
 with parametrically large decay constants in type IIB string models. I
  argue that such axions can be realised as long winding trajectories i
 n complex-structure moduli space by an appropriate flux choice. The ma
 in findings are: The simplest models with aligned winding in a 2-axion
  field space fail due to a general no-go theorem. However\, equally si
 mple models with misaligned winding\, where the effective axion is not
  close to any of the fundamental axions\, appear to work to the best o
 f the present understanding. These models have large decay constants b
 ut no large monotonic regions in the potential\, making them unsuitabl
 e for large-field inflation. I also show that the no-go theorem can be
  avoided by aligning three or more axions. Contrary to misaligned mode
 ls\, such models can in principle have both large decay constants and 
 large monotonic regions in the potential. These results may be used to
  argue against the refined Swampland Distance Conjecture and strong fo
 rms of the axionic Weak Gravity Conjecture. After stabilizing Kähler 
 moduli\, it becomes apparent\, however\, that realizing inflation is b
 y far harder than just producing a light field with large periodicity.
URL:https://www.physics.wisc.edu/events/?id=5084
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