The desert and the swampland

A bstract The most natural expectation away from asymptotic limits in moduli space of supergravity theories is the desert scenario , where there are few states between massless fields and quantum gravity cutoff. In this paper we initiate a systematic study these regions deep space, use it to place bound on number modes by relating black hole species problem. There exists consistent sub-Planckian UV cutoff (the scale) which resolves problem without bounding light modes. We reevaluate context supersymmetric string vacua region show that even though heuristically scale compatible with expectations, BPS actual lead stronger dependence propose discrepancy, can be captured “BPS conjecture”, resurrects idea uniform as way avoid This conjecture also implies form Tadpole Conjecture, leads an obstruction stabilizing all semi-classically for large flux compactifications.