Built on

Pedro G. Ferreira, “Cosmological Tests of Gravity,”
Original
1902
Earlier work this paper cites.
David Andriot, “Open problems on classical de Sitter solutions,”
Original
1902
Earlier work this paper cites.
Harold Jeffreys, The Theory of Probability , Oxford Classic Texts in the Physical Sciences (1939)
1939
Earlier work this paper cites.
H. Akaike, “A New Look at the Statistical Model Identification,”
1974
Earlier work this paper cites.
Gideon Schwarz, “Estimating the dimension of a model,”
1978
Earlier work this paper cites.
Adam G. Riess et al. (Supernova Search Team), “Observational evidence from supernovae for an accelerating universe and a cosmological constant,”
1998
Earlier work this paper cites.
S. Perlmutter et al. (Supernova Cosmology Project), “Measurements of Ω \Omega and Λ \Lambda from 42 high redshift supernovae,”
1999
Earlier work this paper cites.
Michel Chevallier and David Polarski, “Accelerating universes with scaling dark matter,”
2001
Earlier work this paper cites.
Juan Martin Maldacena and Carlos Nunez, “Supergravity description of field theories on curved manifolds and a no go theorem,”
2001
Earlier work this paper cites.
Thomas Sellke, M. J Bayarri, and James O Berger and, “Calibration of p values for testing precise null hypotheses,”
2001
Earlier work this paper cites.
Moncy V. John and J. V. Narlikar, “Comparison of cosmological models using bayesian theory,”
2002
Earlier work this paper cites.
Eric V. Linder, “Exploring the expansion history of the universe,”
2003
Earlier work this paper cites.
Dragan Huterer and Glenn Starkman, “Parameterization of dark-energy properties: A Principal-component approach,”
2003
Earlier work this paper cites.
David Andriot, Niccolò Cribiori, and David Erkinger, “The web of swampland conjectures and the TCC bound,”
Original
2004
Earlier work this paper cites.
Edmund J. Copeland, M. Sami, and Shinji Tsujikawa, “Dynamics of dark energy,”
2006
Earlier work this paper cites.
Mark P. Hertzberg, Shamit Kachru, Washington Taylor, and Max Tegmark, “Inflationary Constraints on Type IIA String Theory,”
Original
2007
Earlier work this paper cites.
S. Nesseris and Leandros Perivolaropoulos, “Crossing the Phantom Divide: Theoretical Implications and Observational Status,”
2007
Earlier work this paper cites.
Yashar Akrami, Misao Sasaki, Adam R. Solomon, and Valeri Vardanyan, “Multi-field dark energy: Cosmic acceleration on a steep potential,”
Original
2008
Earlier work this paper cites.
Roberto Trotta, “Bayes in the sky: Bayesian inference and model selection in cosmology,”
Original
2008
Earlier work this paper cites.
Timothy Clifton, Pedro G. Ferreira, Antonio Padilla, and Constantinos Skordis, “Modified Gravity and Cosmology,”
Original
2012
Earlier work this paper cites.
Kazuharu Bamba, Salvatore Capozziello, Shin’ichi Nojiri, and Sergei D. Odintsov, “Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests,”
Original
2012
Earlier work this paper cites.

Similar

Savvas Nesseris and Juan Garcia-Bellido, “Is the Jeffreys’ scale a reliable tool for Bayesian model comparison in cosmology?”
Original
2013
Cited alongside, same era.
Austin Joyce, Bhuvnesh Jain, Justin Khoury, and Mark Trodden, “Beyond the Cosmological Standard Model,”
Original
2015
Cited alongside, same era.
Kazuya Koyama, “Cosmological Tests of Modified Gravity,”
Original
2016
Cited alongside, same era.
Philip Bull, Yashar Akrami, et al. , “Beyond Λ \Lambda CDM: Problems, solutions, and the road ahead,”
Original
2016
Cited alongside, same era.
Jeppe Trøst Nielsen, Alberto Guffanti, and Subir Sarkar, “Marginal evidence for cosmic acceleration from Type Ia supernovae,”

Then

Samuel Brieden, Héctor Gil-Marín, and Licia Verde, “A tale of two (or more) h’s,”
Original
2023
Later among the works it cites.
Stefano Anselmi, Glenn D. Starkman, and Alessandro Renzi, “Cosmological forecasts for future galaxy surveys with the linear point standard ruler: Toward consistent BAO analyses far from a fiducial cosmology,”
Original
2023
Later among the works it cites.
David Andriot, Susha Parameswaran, Dimitrios Tsimpis, Timm Wrase, and Ivonne Zavala, “Exponential quintessence: curved, steep and stringy?”
Original
2024
Later among the works it cites.
David Andriot, “Quintessence: an analytical study, with theoretical and observational applications,”
Original
2024
Later among the works it cites.
George Alestas, Matilda Delgado, Ignacio Ruiz, Yashar Akrami, Miguel Montero, and Savvas Nesseris, “Is curvature-assisted quintessence observationally viable?”

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2025

Has DESI detected exponential quintessence?

Akrami, Yashar, Alestas, George, Nesseris, Savvas

Understand

The new Dark Energy Spectroscopic Instrument (DESI) DR2 results have strengthened the possibility that dark energy is dynamical, i.e., it has evolved over the history of the Universe.

One simple, but theoretically well motivated and widely studied, physical model of dynamical dark energy is minimally coupled, single-field quintessence $\phi$ with an exponential potential $V(\phi)=V_0\,e^{-\lambda\phi}$.
We perform a full Bayesian statistical analysis of the model using the DESI DR2 data, in combination with other cosmological observations, to constrain the model's parameters and to compare its goodness of fit to that of the standard $\Lambda$CDM model.
We find that the quintessence model provides a significantly better fit to the data, both when the spatial curvature of the Universe is fixed to zero and when it is allowed to vary.

Built on

Pedro G. Ferreira, “Cosmological Tests of Gravity,”
Original
1902
Earlier work this paper cites.
David Andriot, “Open problems on classical de Sitter solutions,”
Original
1902
Earlier work this paper cites.
Harold Jeffreys, The Theory of Probability , Oxford Classic Texts in the Physical Sciences (1939)
1939
Earlier work this paper cites.
H. Akaike, “A New Look at the Statistical Model Identification,”
1974
Earlier work this paper cites.
Gideon Schwarz, “Estimating the dimension of a model,”
1978
Earlier work this paper cites.
Adam G. Riess et al. (Supernova Search Team), “Observational evidence from supernovae for an accelerating universe and a cosmological constant,”
1998
Earlier work this paper cites.
S. Perlmutter et al. (Supernova Cosmology Project), “Measurements of Ω \Omega and Λ \Lambda from 42 high redshift supernovae,”
1999
Earlier work this paper cites.
Michel Chevallier and David Polarski, “Accelerating universes with scaling dark matter,”
2001
Earlier work this paper cites.
Juan Martin Maldacena and Carlos Nunez, “Supergravity description of field theories on curved manifolds and a no go theorem,”
2001
Earlier work this paper cites.
Thomas Sellke, M. J Bayarri, and James O Berger and, “Calibration of p values for testing precise null hypotheses,”
2001
Earlier work this paper cites.
Moncy V. John and J. V. Narlikar, “Comparison of cosmological models using bayesian theory,”
2002
Earlier work this paper cites.
Eric V. Linder, “Exploring the expansion history of the universe,”
2003
Earlier work this paper cites.
Dragan Huterer and Glenn Starkman, “Parameterization of dark-energy properties: A Principal-component approach,”
2003
Earlier work this paper cites.
David Andriot, Niccolò Cribiori, and David Erkinger, “The web of swampland conjectures and the TCC bound,”
Original
2004
Earlier work this paper cites.
Edmund J. Copeland, M. Sami, and Shinji Tsujikawa, “Dynamics of dark energy,”
2006
Earlier work this paper cites.
Mark P. Hertzberg, Shamit Kachru, Washington Taylor, and Max Tegmark, “Inflationary Constraints on Type IIA String Theory,”
Original
2007
Earlier work this paper cites.
S. Nesseris and Leandros Perivolaropoulos, “Crossing the Phantom Divide: Theoretical Implications and Observational Status,”
2007
Earlier work this paper cites.
Yashar Akrami, Misao Sasaki, Adam R. Solomon, and Valeri Vardanyan, “Multi-field dark energy: Cosmic acceleration on a steep potential,”
Original
2008
Earlier work this paper cites.
Roberto Trotta, “Bayes in the sky: Bayesian inference and model selection in cosmology,”
Original
2008
Earlier work this paper cites.
Timothy Clifton, Pedro G. Ferreira, Antonio Padilla, and Constantinos Skordis, “Modified Gravity and Cosmology,”
Original
2012
Earlier work this paper cites.
Kazuharu Bamba, Salvatore Capozziello, Shin’ichi Nojiri, and Sergei D. Odintsov, “Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests,”
Original
2012
Earlier work this paper cites.