Decoupling limits in multi-sector supergravities

Understand

Conventional approaches to cosmology in supergravity assume the existence of multiple sectors that only communicate gravitationally.

• In principle these sectors decouple in the limit Planck mass to infinity.
• In practice such a limit is delicate: for generic supergravities, where sectors are combined by adding their Kahler functions, the separate superpotentials must contain non-vanishing vacuum expectation values supplementing the naive global superpotential.
• We show that this requires non-canonical scaling in the naive supergravity superpotential couplings to recover independent sectors of globally supersymmetric field theory in the decoupling limit Planck Mass to infinity.