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Heterotic Moduli Stabilization with Fractional Chern-Simons Invariants
Sergei Gukov, Shamit Kachru, Xiao Liu +1
We show that fractional flux from Wilson lines can stabilize the moduli of heterotic string compactifications on Calabi-Yau threefolds. We observe that the Wilson lines used in GUT…
Large scale power and running spectral index in New Old Inflation
Gia Dvali, Shamit Kachru
We have proposed a new class of inflationary scenarios in which the first stage of expansion is driven by "old" false vacuum inflation. This ends by nucleation of a bubble, which t…
Towards Inflation in String Theory
Shamit Kachru, Renata Kallosh, Andrei Linde +3
We investigate the embedding of brane inflation into stable compactifications of string theory. At first sight a warped compactification geometry seems to produce a naturally flat…
New Old Inflation
Gia Dvali, Shamit Kachru
We propose a new class of inflationary solutions to the standard cosmological problems (horizon, flatness, monopole,...), based on a modification of old inflation. These models do…
de Sitter Vacua in String Theory
Shamit Kachru, Renata Kallosh, Andrei Linde +1
We outline the construction of metastable de Sitter vacua of type IIB string theory. Our starting point is highly warped IIB compactifications with nontrivial NS and RR three-form…