Fractons, non-Riemannian Geometry, and Double Field Theory

Abstract

We initiate a systematic study of fracton physics within the geometric framework of Double Field Theory. We ascribe the immobility and large degeneracy of the former to the non-Riemannian backgrounds of the latter, in terms of generalised geodesics and infinite-dimensional isometries. A doubled pure Yang-Mills or Maxwell theory reduces to an ordinary one coupled to a strain tensor of elasticity theory, and thus rather remarkably provides a unifying description of photons and phonons. Upon a general Double Field Theory background, which consists of Riemannian and non-Riemannian subspaces, the dual photon-phonon pair becomes fractonic over the non-Riemannian subspace. When the elasticity displacement vector condenses, minimally coupled charged particles acquire an effective mass even in the purely Riemannian case, yielding predictions for polaron physics and time crystals. Furthermore, the immobility of neutral particles along the non-Riemannian directions is lifted to a saturation velocity for charged particles. Utilising the differential geometry of Double Field Theory we also present curved spacetime extensions which exhibit general covariance.

v3) Published version. Title changed from "Fractons, geometrically" to current title; minor revisions. v2) 12 pages + appendix + references = 17 pages. Revised and expanded version: includes extensions to curved spacetime, predictions for polaron mass and time crystals, further clarifying remarks and details, and additional references. v1) 5 pages + supplemental material + references = 10 pages

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• Hierarchical Proliferation of Higher-Rank Symmetry Defects in Fractonic Superfluids
• Perturbations in $\mathbf{O}(D,D)$ string cosmology from double field theory
• Fractonic superfluids. III. Hybridizing higher moments
• Gravitational Core of Double Field Theory: Lecture Notes
• Infinite-component $BF$ field theory: Connection of fracton order, Toeplitz braiding, and non-Hermitian amplification
• Preparing Code States via Seed-Entangler-Enriched Sequential Quantum Circuits: Application to Tetra-Digit Topological Error-Correcting Codes