Asymmetric Cosets
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The aim of this work is to present a general theory of coset models G/H in which different left and right actions of H on G are gauged. Our main results include a formula for their modular invariant partition function, the construction of a large set of boundary states and a general description of the corresponding brane geometries. The paper concludes with some explicit applications to the base of the conifold and to the time-dependent Nappi-Witten background.
34 pages, LaTeX, 8 figures, 1 table, v2: references added, v3: typos corrected
34 pages, LaTeX, 8 figures, 1 table, v2: references added, v3: typos corrected