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15 papers · 2 filters
The D^6 R^4 term in type IIB string theory on T^2 and U-duality
Anirban Basu
We propose a manifestly U-duality invariant modular form for the D^6 R^4 interaction in the effective action of type IIB string theory compactified on T^2. It receives perturbative…
Topology from Cosmology
Vijay Balasubramanian, Per Berglund, Raul Jimenez +2
We show that cosmological observables can constrain the topology of the compact additional dimensions predicted by string theory. To do this, we develop a general strategy for rela…
Gauge Theory And Wild Ramification
Edward Witten
The gauge theory approach to the geometric Langlands program is extended to the case of wild ramification. The new ingredients that are required, relative to the tamely ramified ca…
Asymptotic Spectroscopy of Rotating Black Holes
Uri Keshet, Andrew Neitzke
We calculate analytically the transmission and reflection amplitudes for waves incident on a rotating black hole in d=4, analytically continued to asymptotically large, nearly imag…
Fermions on one or fewer Kinks
Yi-Zen Chu, Tanmay Vachaspati
We find the full spectrum of fermion bound states on a Z_2 kink. In addition to the zero mode, there are int[2 m_f/m_s] bound states, where m_f is the fermion and m_s the scalar ma…
The D^4 R^4 term in type IIB string theory on T^2 and U-duality
Anirban Basu
We propose a manifestly U-duality invariant modular form for the D^4 R^4 interaction in type IIB string theory compactified on T^2. It receives perturbative contributions upto two…