Carroll fermions in two dimensions

Abstract

Carroll symmetry is a very powerful characteristic of generic null surfaces, as it replaces the usual Poincaré algebra with a vanishing speed of light version thereof. These symmetries have found universal applications in the physics of null manifolds as they arise in diverse situations ranging from black hole horizons to condensed matter systems with vanishing Fermi velocities. In this work, we concentrate on fermions living on two dimensional ($2d$) null manifolds and explore the Carroll invariant structure of the associated field theories in a systematic manner. The free massless versions of these fermions are shown to exhibit $2d$ Conformal Carroll or equivalently the $3d$ Bondi-Metzner-Sachs (BMS) algebra as their symmetry. Due to the degenerate nature of the manifold, we show the presence of two distinct classes of Clifford Algebras. We also find that in two dimensions there are two distinct fermion actions. We study discrete and continuous symmetries of both theories, and quantize them using highest weight representation of the vacuum. We also discuss how the symmetries of $2d$ free fermion CFTs can be continually deformed by infinite boosts or degenerate linear transformations on coordinates, leading to the corresponding BMS invariant theory at singular points.

arXiv comment37 pages, no figures

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Cited by in corpus (13)

• Super-Carrollian and Super-Galilean Field Theories
• Quantization of Carrollian conformal scalar theories
• Flat Bands and Compact Localised States: A Carrollian roadmap
• Bulk Reconstruction of Scalar Excitations in Flat${}_3$/CCFT${}_2$ and the Flat Limit from (A)dS${}_3$/CFT${}_2$
• Irrelevant and marginal deformed BMS field theories
• Classification of Conformal Carroll Algebras
• Quantization of Carrollian fermions
• A Carroll Limit of AdS/CFT: A Triality with Flat Space Holography?
• Carroll spinors
• Carroll-Schrödinger Equation
• Universal sectors of two-dimensional Carrollian CFTs
• Conformal Blocks in 2d Carrollian/Galilean CFTs and Excited State Entanglement Entropy
• On $\sqrt{T\overline{T}}$ deformed pathways: CFT to CCFT