{"paper":{"title":"What is Classical Null String Theory?","arxiv_id":"2609.04844","primary_cat":"hep-th","submitted_at":"2026-09-04T08:01:24+00:00","version_compiled":"v1"},"notice":"Every quoted sentence is the authors' text from the arXiv listing abstract. Labels and probabilities are the outputs of classifier-1.13.0 on the question bank abstract-p1-20260923, exactly as returned. No sentence in this record was written by a language model.","schema":"pith.compiled-record/v0","status":"compiled","abstract":{"source":"arXiv listing abstract v1","sentences":[{"i":0,"p":0.93,"id":"s0","own":true,"role":"contribution","text":"We revisit the classical definition of a null string in a D-dimensional Minkowski target space and distinguish a consistent partially-gauged Carrollian sigma-model from the null string theory.","hedge":{"p":0.99,"label":"asserted"},"own_p":0.84,"main_claim_p":0.17,"quantitative":false,"quantitative_p":0.47,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.0,"background":0.07,"limitation":0.0,"future_work":0.0,"contribution":0.93,"interpretation":0.0}},{"i":1,"p":0.59,"id":"s1","own":false,"role":"background","text":"The Isberg-Lindstr\\\"om-Sundborg-Theodoridis (ILST) action gauges worldsheet diffeomorphisms and the common Weyl rescaling, but not the independent relative rescaling of the temporal and spatial representatives of the intrinsic Carrollian structure, Carroll-Weyl scaling.","hedge":{"p":1.0,"label":"asserted"},"own_p":0.19,"main_claim_p":0.08,"quantitative":false,"quantitative_p":0.15,"role_probabilities":{"gap":0.18,"method":0.03,"result":0.12,"background":0.59,"limitation":0.0,"future_work":0.0,"contribution":0.07,"interpretation":0.01}},{"i":2,"p":0.55,"id":"s2","own":false,"role":"interpretation","text":"A physical string theory requires every local change of worldsheet representative to be gauged, therefore, the Carroll-Weyl symmetry should be gauged in a null string theory.","hedge":{"p":0.99,"label":"asserted"},"own_p":0.33,"main_claim_p":0.28,"quantitative":false,"quantitative_p":0.08,"role_probabilities":{"gap":0.16,"method":0.01,"result":0.16,"background":0.04,"limitation":0.0,"future_work":0.0,"contribution":0.08,"interpretation":0.55}},{"i":3,"p":0.99,"id":"s3","own":true,"role":"result","text":"In the minimal realization, the corresponding gauging is obstructed at finite tension, whereas at zero tension it yields an additional first-class constraint and the associated identification of physical configurations along its gauge orbits.","hedge":{"p":1.0,"label":"asserted"},"own_p":0.76,"main_claim_p":0.19,"quantitative":true,"quantitative_p":0.72,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.99,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.01,"interpretation":0.0}},{"i":4,"p":0.98,"id":"s4","own":true,"role":"interpretation","text":"The description of the null worldsheet as a congruence of null geodesics provides a complementary target-space interpretation of gauging of the Carroll-Weyl scaling.","hedge":{"p":0.97,"label":"asserted"},"own_p":0.71,"main_claim_p":0.08,"quantitative":false,"quantitative_p":0.06,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.01,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.01,"interpretation":0.98}},{"i":5,"p":0.62,"id":"s5","own":true,"role":"result","text":"Our analysis thus 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