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The Maximum Neutron-Star Mass and Tidal Deformability in the Aldred Frame: FPS and SLy Structure with the Spin-Torsion Correction and the GW170817 Bound

Year: 2026
Type: article
Abstract: A companion paper (DOI 10.5281/zenodo.24102729) integrated the non-rotating TOV equations with the Aldred-frame spin-torsion correction for a polytrope and SLy and reported the maximum mass and R(1.4 Msun); it did not compute the tidal deformability. This paper fills that gap with a different equation-of-state pair. The Hinderer tidal equation is integrated alongside the TOV equations for FPS (soft) and SLy (stiffer) in the Haensel and Potekhin (2004) parametrisation, with the correction Delta rho/rho = rho/rho_A, rho_A = 9.72e54 g/cm3. General relativity: FPS Mmax = 1.799 Msun, R1.4 = 10.82 km, Lambda1.4 = 173; SLy Mmax = 2.048 Msun, R1.4 = 11.69 km, Lambda1.4 = 297. At the stated strength the correction shifts Lambda1.4 by +2.60e-39 (FPS) and +2.35e-39 (SLy) fractionally and Mmax by -3.0e-40 Msun (FPS) and -1.8e-40 Msun (SLy). At every anchor (PSR J0348+0432, PSR J0740+6620, PSR J0952-0607, NICER J0030+0451 and J0740+6620 radii, GW170817 Lambda1.4 <= 800 / refined 70-580) the correction is invisible, excluded at no anchor, and FPS remains excluded by the 2 Msun pulsars with and without it. AI-use disclosure: this work was prepared with the assistance of Dave, an artificial intelligence system built and operated by Aldred Industries; computations were performed by the deposited script compute.py and the author reviewed the results and takes responsibility for the contents.
DOI: 10.5281/zenodo.24110766
Language: English
Open Access status: green
OpenAlex ID: W7225747519
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