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On the scarcity of weak coupling in the string landscape. (English) Zbl 1387.83084
Summary: We study the geometric requirements on a threefold base for the corresponding F-theory compactification to admit a weakly-coupled type IIB limit. We examine both the standard Sen limit and a more restrictive limit, and determine conditions sufficient for their non-existence for both toric bases and more general algebraic bases. In a large ensemble of geometries generated by base changing resolutions we derive an upper bound on the frequency with which a weak-coupling limit may occur, and find that such limits are extremely rare. Our results sharply quantify the widely held notion that the vast number of weakly-coupled IIB vacua is but a tiny fraction of the landscape.

##### MSC:
 8.3e+31 String and superstring theories in gravitational theory
##### Keywords:
F-theory; flux compactifications
Full Text:
##### References:
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