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2016

On the curious spectrum of duality invariant higher-derivative gravity

Hohm, Olaf, Naseer, Usman, Zwiebach, Barton

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We analyze the spectrum of the exactly duality and gauge invariant higher-derivative double field theory.

While this theory is based on a chiral CFT and does not correspond to a standard string theory, our analysis illuminates a number of issues central in string theory.
The full quadratic action is rewritten as a two-derivative theory with additional fields.
This allows for a simple analysis of the spectrum, which contains two massive spin-2 ghosts and massive scalars, in addition to the massless fields.

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