Constraining GREA, an alternative theory accounting for the present cosmic acceleration
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2025
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866912606154915840 |
|---|---|
| author | Calderon, R. Garcia-Bellido, J. Vos-Gines, B. Gonzalez-Perez, V. Shafieloo, A. Aguilar, J. Ahlen, S. Bianchi, D. Brooks, D. Claybaugh, T. de la Macorra, A. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Honscheid, K. Howlett, C. Ishak, M. Joyce, R. Kehoe, R. Kisner, T. Kremin, A. Lahav, O. Lambert, A. Landriau, M. Manera, M. Miquel, R. Prada, F. Perez-Rafols, I. Sanchez, E. Schlegel, D. Schubnell, M. Silber, J. Sprayberry, D. Tarle, G. Weaver, B. A. Zou, H. |
| author_facet | Calderon, R. Garcia-Bellido, J. Vos-Gines, B. Gonzalez-Perez, V. Shafieloo, A. Aguilar, J. Ahlen, S. Bianchi, D. Brooks, D. Claybaugh, T. de la Macorra, A. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Honscheid, K. Howlett, C. Ishak, M. Joyce, R. Kehoe, R. Kisner, T. Kremin, A. Lahav, O. Lambert, A. Landriau, M. Manera, M. Miquel, R. Prada, F. Perez-Rafols, I. Sanchez, E. Schlegel, D. Schubnell, M. Silber, J. Sprayberry, D. Tarle, G. Weaver, B. A. Zou, H. |
| contents | The origin of the Universe's late-time accelerated expansion remains unknown. The General Relativistic Entropic Acceleration (GREA) theory offers a compelling alternative to $Λ$CDM, attributing cosmic acceleration to entropy growth associated with cosmic and black hole horizons, without invoking a cosmological constant. We test GREA against the latest DESI DR2 Baryon Acoustic Oscillations (BAO), multiple Type Ia supernova compilations (Union3, Pantheon$\texttt{+}$, DES-SN5YR), and cosmic microwave background (CMB) distance measurements. While GREA is not nested within $Λ$CDM, it achieves a comparable goodness-of-fit, highlighting its potential as a theoretically motivated framework that circumvents some of the fine-tuning issues of the standard $Λ$CDM cosmology. We find that the best-fit model features a transient phantom crossing at $z \lesssim 2$, with $w_a\equiv \mathrm{d} w(a=1)/\mathrm{d}a \simeq-0.3$, in good agreement with observations. However, its present-day value $w_0\equiv w(z=0)$ is tightly constrained to be $w_0\simeq-1$. Upcoming low-redshift (i.e. $z < 1$) cosmological probes, from both background and perturbations, will offer promising avenues for further exploring the viability of the GREA theory. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_21491 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Constraining GREA, an alternative theory accounting for the present cosmic acceleration Calderon, R. Garcia-Bellido, J. Vos-Gines, B. Gonzalez-Perez, V. Shafieloo, A. Aguilar, J. Ahlen, S. Bianchi, D. Brooks, D. Claybaugh, T. de la Macorra, A. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Honscheid, K. Howlett, C. Ishak, M. Joyce, R. Kehoe, R. Kisner, T. Kremin, A. Lahav, O. Lambert, A. Landriau, M. Manera, M. Miquel, R. Prada, F. Perez-Rafols, I. Sanchez, E. Schlegel, D. Schubnell, M. Silber, J. Sprayberry, D. Tarle, G. Weaver, B. A. Zou, H. Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology The origin of the Universe's late-time accelerated expansion remains unknown. The General Relativistic Entropic Acceleration (GREA) theory offers a compelling alternative to $Λ$CDM, attributing cosmic acceleration to entropy growth associated with cosmic and black hole horizons, without invoking a cosmological constant. We test GREA against the latest DESI DR2 Baryon Acoustic Oscillations (BAO), multiple Type Ia supernova compilations (Union3, Pantheon$\texttt{+}$, DES-SN5YR), and cosmic microwave background (CMB) distance measurements. While GREA is not nested within $Λ$CDM, it achieves a comparable goodness-of-fit, highlighting its potential as a theoretically motivated framework that circumvents some of the fine-tuning issues of the standard $Λ$CDM cosmology. We find that the best-fit model features a transient phantom crossing at $z \lesssim 2$, with $w_a\equiv \mathrm{d} w(a=1)/\mathrm{d}a \simeq-0.3$, in good agreement with observations. However, its present-day value $w_0\equiv w(z=0)$ is tightly constrained to be $w_0\simeq-1$. Upcoming low-redshift (i.e. $z < 1$) cosmological probes, from both background and perturbations, will offer promising avenues for further exploring the viability of the GREA theory. |
| title | Constraining GREA, an alternative theory accounting for the present cosmic acceleration |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2509.21491 |