Spectrum of Higher Derivative 6D Chiral Supergravity

Understand

Gauged off-shell Maxwell-Einstein supergravity in six dimensions with N=(1,0) supersymmetry has a higher derivative extension afforded by a supersymmetrized Riemann squared term.

• This theory admits a supersymmetric Minkowski x S^2 compactification with a U(1) monopole of unit charge on S^2.
• We determine the full spectrum of the theory on this background.
• We also determine the spectrum on a non-supersymmetric version of this compactification in which the monopole charge is different from unity, and we find the peculiar feature that there are massless gravitini in a representation of the S^2 isometry group determined by the monopole charge.