Analysis of Pantheon+ supernova data suggests evidence of sign-changing pressure of the cosmological fluid
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866914174295080960 |
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| author | Çamlıbel, A. Kazım Feyizoğlu, M. Akif Semiz, İbrahim |
| author_facet | Çamlıbel, A. Kazım Feyizoğlu, M. Akif Semiz, İbrahim |
| contents | In this work, we revisit/reinterpret/extend the model-independent analysis method (which we now call spread - luminosity distance fitting, spread-LDF) from our previous work. We apply it to the updated supernova type Ia catalogue, Pantheon+ and recent GRB compilations. The procedure allows us, using only FLRW assumption, to construct good approximations for expansion history of the universe, re-confirming its acceleration to be a robust feature. When we also assume General Relativity ("GR"), we can demonstrate, without any matter/energy model in mind, the need for (possibly nonconstant) dark energy ("GDE"). We find hints for positive pressure of GDE at z>1 with implications on either the complexity of dark energy, or the validity of one of the cosmological principle, interpretation of SN Ia data, or GR. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_06861 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Analysis of Pantheon+ supernova data suggests evidence of sign-changing pressure of the cosmological fluid Çamlıbel, A. Kazım Feyizoğlu, M. Akif Semiz, İbrahim General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics In this work, we revisit/reinterpret/extend the model-independent analysis method (which we now call spread - luminosity distance fitting, spread-LDF) from our previous work. We apply it to the updated supernova type Ia catalogue, Pantheon+ and recent GRB compilations. The procedure allows us, using only FLRW assumption, to construct good approximations for expansion history of the universe, re-confirming its acceleration to be a robust feature. When we also assume General Relativity ("GR"), we can demonstrate, without any matter/energy model in mind, the need for (possibly nonconstant) dark energy ("GDE"). We find hints for positive pressure of GDE at z>1 with implications on either the complexity of dark energy, or the validity of one of the cosmological principle, interpretation of SN Ia data, or GR. |
| title | Analysis of Pantheon+ supernova data suggests evidence of sign-changing pressure of the cosmological fluid |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2508.06861 |