arXiv preprint · 2026

Signed Sound-Speed Deformations of BSk24-Anchored Barotropes: Neutron-Star Response

Ioannis Papathanasiou, sole author · arXiv:2608.23033v1 [nucl-th] · submitted 2026-08-24 · cross-listed in astro-ph.HE · 19 pages, 10 figures, 6 tables.

A controlled study of how signed local sound-speed changes propagate through thermodynamic reconstruction and central-state relocation into a mass-dependent, nonlinear, sign-asymmetric neutron-star response. The effective barotropes are not BSk24 predictions or evidence for a microscopic composition or phase transition.

Public preprint; not peer reviewed, not a journal publication or journal-accepted work. No journal submission is planned.

arXiv record PDF BibTeX Research context

Software · v1.0.0

EoS Generation

A focused Python implementation of controlled BSk24 sound-speed deformations, thermodynamic assessment, reconstruction, and optional TOV/tidal calculations. MIT licensed, tested, documented, and supplied with citation metadata.

Release Repository

Data · v1.0.0

BSk24 signed-amplitude campaign evidence

Analysis-ready tables, figures, campaign declarations, provenance records, checksums, and sanitized calculation/reporting source. Released data and figures are CC BY 4.0; released code is MIT licensed.

Data release Read the case study

Undergraduate thesis · 2026

Machine Learning Classification of Neutron Star Composition

A synthetic compact-star model-discrimination study examined in February 2026 (10/10). The examined thesis is distinct from the later methodological redevelopment and from the BSk24 preprint.

Thesis and redevelopment context

Software · public demonstrations

Interactive compact-star classifier demonstrations

Two independent post-thesis applications expose retained classifier artifacts as restricted synthetic model scores. They are not observational inference services or composition-probability tools.

Scope and launch notes Baseline demonstration Perturbation sensitivity

Ongoing software · alpha

Neutron-star EoS toolkit

Early-stage development work for analytical, CSV, and cold one-dimensional CompOSE inputs and continuous source-boundary TOV backgrounds. It has no formal release or public benchmark result packet; the repository link is omitted while public-scope and citation wording remain under review.

Scope and limitations