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127 papers · 1 filter
Enhanced (p)reheating in DBI Inflation
A. C. Davis, Raquel H. Ribeiro
We study preheating in DBI hybrid inflation. Preheating occurs since the matter fields are non-minimally coupled to the inflaton. Despite the coupling being small, preheating happe…
SUSY Breaking in Local String/F-Theory Models
R. Blumenhagen, J. P. Conlon, S. Krippendorf +2
We investigate bulk moduli stabilisation and supersymmetry breaking in local string/F-theory models where the Standard Model is supported on a del Pezzo surface or singularity. Com…
Gravitational Dual of Tachyon Condensation
Gary W. Gibbons, Koji Hashimoto, Shinji Hirano
We study a system of N D3-branes in which open string tachyons survive in the low energy alpha' -> 0 limit. We compute the height of the tachyon potential both in the weak and stro…
More on Massive 3D Gravity
Eric A. Bergshoeff, Olaf Hohm, Paul K. Townsend
We explore the space of static solutions of the recently discovered three-dimensional `New Massive Gravity' (NMG), allowing for either sign of the Einstein-Hilbert term and a cosmo…
Kerr-CFT and gravitational perturbations
Oscar J. C. Dias, Harvey S. Reall, Jorge E. Santos
Motivated by the Kerr-CFT conjecture, we investigate perturbations of the near-horizon extreme Kerr spacetime. The Teukolsky equation for a massless field of arbitrary spin is solv…
The Partonic Nature of Instantons
Benjamin Collie, David Tong
In both Yang-Mills theories and sigma models, instantons are endowed with degrees of freedom associated to their scale size and orientation. It has long been conjectured that these…