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The low density matter is described by a nuclear matter equation of state resulting from fits to nuclear properties. A constant speed of sound parametrization is used to describe the high density matter phase with the speed of sound $c_s^2=1$.\n  A classification scheme of four distinct categories including twin star solutions, i. e. solutions with the same mass but differing radii, is found which are compatible with the $M \\ge 2M_\\odot$ pulsar mass constraint.\n  We show"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1707.07524","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2017-07-24T12:49:14Z","cross_cats_sorted":[],"title_canon_sha256":"db4338b8fea435e52d06f24c936e09b4e9bb29e3887b66f61897e35f582490f4","abstract_canon_sha256":"0bc97042354c418461fe5e365171b187c6b9092595c1afcaf6e7d89e8b11851f"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:19:27.507377Z","signature_b64":"182MzUWlQZFBdVK0AgBUaszH0D3l6SwmxU+0aXfBwIG4ITM9HJPSbCzeAtR8sQeN2I8dcAXtyLFN/Sts/9CADQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b814508e54978aba21156b0f2299fcf5123830774bc654f79c6c11e5b8d935a7","last_reissued_at":"2026-05-18T00:19:27.506892Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:19:27.506892Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Classifications of Twin Star Solutions for a Constant Speed of Sound Parameterized Equation of State","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Andreas Zacchi, Jan-Erik Christian, J\\\"urgen Schaffner-Bielich","submitted_at":"2017-07-24T12:49:14Z","abstract_excerpt":"We explore the possible mass radius relation of compact stars for the equation of states with a first order phase transition. 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