2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/206522Nonrelativistic Fermi liquids in d+1 dimensions exhibit generalized Fermi surfaces: (d-p)-dimensional submanifolds in the momentum-frequency space supporting gapless excitations. We show that the universality classes of stable Fermi surfaces are classified by K-theory, with the pattern of stability determined by Bott periodicity. The Atiyah-Bott-Shapiro construction implies that the low-energy modes near a Fermi surface exhibit relativistic invariance in the transverse p+1 dimensions. This suggests an intriguing parallel between norelativistic Fermi liquids and D-branes of string theory.4 pages, revtexHigh Energy Physics - TheoryMesoscale and Nanoscale PhysicsStrongly Correlated ElectronsAlgebraic Topologytext