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Noncritical M-theory in 2+1 dimensions has been defined as a double-scalinglimit of a nonrelativistic Fermi liquid on a flat two-dimensional plane. Herewe study this noncritical M-theory in the limit of high energies, analogous tothe \alpha'\to\infty limit of string theory. In the related case oftwo-dimensional Type 0A strings, it has been argued that the conformal\alpha'\to\infty limit leads to AdS_2 with a propagating fermion whose mass isset by the value of the RR flux. Here we provide evidence that in thehigh-energy limit, the natural ground state of noncritical M-theory similarlydescribes the AdS_2\times S^1 spacetime, with a massless propagating fermion.We argue that the spacetime effective theory in this background is captured bya topological higher-spin extension of conformal Chern-Simons gravity in 2+1dimensions, consistently coupled to a massless Dirac field. Intriguingly, thetwo-dimensional plane populated by the original nonrelativistic fermions isessentially the twistor space associated with the symmetry group of theAdS_2\times S^1 spacetime; thus, at least in the high-energy limit, noncriticalM-theory can be nonperturbatively described as a "Fermi liquid on twistorspace."

Strings on AdS_2 and the High-Energy Limit of Noncritical M-Theory