Kaluza-Klein spectrometry for AdS3 vacua

We use exceptional field theory to compute Kaluza-Klein mass spectra around AdS(3) vacua that sit in half-maximal gauged supergravity in three dimensions. The formalism applies to any vacuum that arises from a consistent truncation of higher-dimensional supergravity, no matter what symmetries are preserved. We illustrate its efficiency by computing the spectra of N = (2, 0) and N = (1, 1) six-dimensional supergravities on AdS(3) x S-3 and of type II supergravity on AdS(3) x S-3 x S-3 x S-1.

Automated summary

We use exceptional field theory to calculate Kaluza-Klein mass spectra around AdS(3) vacua in half-maximal gauged supergravity, applicable to any vacuum arising from a consistent truncation of higher-dimensional supergravity, regardless of preserved symmetries. Its efficiency is illustrated by computing the spectra of N=(2,0) and N=(1,1) six-dimensional supergravities on AdS(3) x S-3 and type II supergravity on AdS(3) x S-3 x S-3 x S-1.