Paper
Observational and Thermodynamic aspects of one-dimensional Dark Energy EoS parametrization models
Authors
Anirban Chatterjee, Yungui Gong
Abstract
We examine the observational viability and physical implications of the Gong-Zhang (GZ) dark--energy equation-of-state parametrizations using exclusively late-time cosmological probes. Two one-dimensional parametrization models, GZ-Type~I and GZ-Type~II, are constrained with Type~Ia supernovae (Union3, Pantheon+SH0ES, and DES-SN5YR), DESI baryon acoustic oscillations, and cosmic chronometer measurements of $H(z)$. Bayesian inference combined with information-criteria diagnostics shows that both parametrizations provide competitive alternatives to $Λ$CDM, while the GZ-Type~II model is consistently favored, exhibiting reduced parameter degeneracy and stronger Jeffreys-scale support. Beyond background expansion tests, we employ configuration entropy as a thermodynamically motivated probe of structure formation. We demonstrate that the entropy-production rate sensitively traces the impact of dynamical dark energy on late-time gravitational clustering while preserving standard early-time behavior. Our results establish the Gong-Zhang framework as a physically transparent and observationally consistent extension of $Λ$CDM, with configuration entropy providing a complementary diagnostic of late-time cosmic acceleration.
Metadata
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Raw Data (Debug)
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"raw_xml": "<entry>\n <id>http://arxiv.org/abs/2603.05009v1</id>\n <title>Observational and Thermodynamic aspects of one-dimensional Dark Energy EoS parametrization models</title>\n <updated>2026-03-05T09:55:17Z</updated>\n <link href='https://arxiv.org/abs/2603.05009v1' rel='alternate' type='text/html'/>\n <link href='https://arxiv.org/pdf/2603.05009v1' rel='related' title='pdf' type='application/pdf'/>\n <summary>We examine the observational viability and physical implications of the Gong-Zhang (GZ) dark--energy equation-of-state parametrizations using exclusively late-time cosmological probes. Two one-dimensional parametrization models, GZ-Type~I and GZ-Type~II, are constrained with Type~Ia supernovae (Union3, Pantheon+SH0ES, and DES-SN5YR), DESI baryon acoustic oscillations, and cosmic chronometer measurements of $H(z)$. Bayesian inference combined with information-criteria diagnostics shows that both parametrizations provide competitive alternatives to $Λ$CDM, while the GZ-Type~II model is consistently favored, exhibiting reduced parameter degeneracy and stronger Jeffreys-scale support. Beyond background expansion tests, we employ configuration entropy as a thermodynamically motivated probe of structure formation. We demonstrate that the entropy-production rate sensitively traces the impact of dynamical dark energy on late-time gravitational clustering while preserving standard early-time behavior. Our results establish the Gong-Zhang framework as a physically transparent and observationally consistent extension of $Λ$CDM, with configuration entropy providing a complementary diagnostic of late-time cosmic acceleration.</summary>\n <category scheme='http://arxiv.org/schemas/atom' term='gr-qc'/>\n <published>2026-03-05T09:55:17Z</published>\n <arxiv:comment>16 pages, 9 figures and 2 tables</arxiv:comment>\n <arxiv:primary_category term='gr-qc'/>\n <author>\n <name>Anirban Chatterjee</name>\n </author>\n <author>\n <name>Yungui Gong</name>\n </author>\n </entry>"
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