{"paper":{"title":"New Massless Spectra from Cosmic String Cusps","arxiv_id":"2512.12258","primary_cat":"hep-ph","submitted_at":"2025-12-13T09:56:37+00:00","version_compiled":"v2"},"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 v2","sentences":[{"i":0,"p":1.0,"id":"s0","own":false,"role":"background","text":"In the standard picture of cosmic strings, cusps are generic features of Nambu-Goto loops where the string momentarily reaches the speed of light.","hedge":{"p":1.0,"label":"asserted"},"own_p":0.04,"main_claim_p":0.03,"quantitative":false,"quantitative_p":0.09,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.0,"background":1.0,"limitation":0.0,"future_work":0.0,"contribution":0.0,"interpretation":0.0}},{"i":1,"p":1.0,"id":"s1","own":false,"role":"background","text":"They have a characteristic sharp profile, following $y \\sim x^{2/3}$ in the $(x,y)$ plane, and produce strong gravitational-wave (GW) bursts with waveform $\\tilde\\kappa(\\omega) \\propto \\omega^{-4/3}$, making them key targets for GW searches.","hedge":{"p":1.0,"label":"asserted"},"own_p":0.07,"main_claim_p":0.04,"quantitative":true,"quantitative_p":0.87,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.0,"background":1.0,"limitation":0.0,"future_work":0.0,"contribution":0.0,"interpretation":0.0}},{"i":2,"p":0.81,"id":"s2","own":false,"role":"gap","text":"However, under certain conditions, this generic picture can differ.","hedge":{"p":0.78,"label":"hedged_possibility"},"own_p":0.06,"main_claim_p":0.04,"quantitative":false,"quantitative_p":0.04,"role_probabilities":{"gap":0.81,"method":0.0,"result":0.0,"background":0.19,"limitation":0.0,"future_work":0.0,"contribution":0.0,"interpretation":0.0}},{"i":3,"p":0.99,"id":"s3","own":true,"role":"contribution","text":"We identify novel cusp solutions with different, including smooth, shapes, and compute their massless GW and axion spectra.","hedge":{"p":1.0,"label":"asserted"},"own_p":0.97,"main_claim_p":0.59,"quantitative":false,"quantitative_p":0.09,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.01,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.99,"interpretation":0.0}},{"i":4,"p":0.81,"id":"s4","own":true,"role":"result","text":"We derive a general expression for all possible Nambu-Goto cusp spectra with the asymptotic form $\\tilde\\kappa(\\omega) \\propto \\omega^{-n/(2n-1)} \\omega^{-m/(2m-1)}$ where $n, m\\geq 2$.","hedge":{"p":1.0,"label":"asserted"},"own_p":0.96,"main_claim_p":0.43,"quantitative":true,"quantitative_p":0.86,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.81,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.19,"interpretation":0.0}},{"i":5,"p":0.67,"id":"s5","own":true,"role":"contribution","text":"We calculate the effect on the waveform of realistic corrections to the Nambu-Goto description, such as those from backreaction and 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