Built on

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Similar

T. Multamaki and I. Vilja, Cosmological expansion and the uniqueness of gravitational action , Phys. Rev. D73
2006
Cited alongside, same era.
R. Arjona, J. García-Bellido and S. Nesseris, Cosmological constraints on non-adiabatic dark energy perturbations , 2006.01762
Original
2006
Cited alongside, same era.
G. Efstathiou, A Lockdown Perspective on the Hubble Tension (with comments from the SH0ES team) , 2007.10716
Original
2007
Cited alongside, same era.
D. F. Mota, J. R. Kristiansen, T. Koivisto and N. E. Groeneboom, Constraining Dark Energy Anisotropic Stress , Mon. Not. Roy. Astron. Soc. 382
Original
2007
Cited alongside, same era.
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Then

A. Montiel, R. Lazkoz, I. Sendra, C. Escamilla-Rivera and V. Salzano, Nonparametric reconstruction of the cosmic expansion with local regression smoothing and simulation extrapolation , Phys. Rev. D89
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2014
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S. Yahya, M. Seikel, C. Clarkson, R. Maartens and M. Smith, Null tests of the cosmological constant using supernovae , Phys. Rev. D89
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2014
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C. Zhang, H. Zhang, S. Yuan, T.-J. Zhang and Y.-C. Sun, Four new observational H ⁡ ( z ) H(z) data from luminous red galaxies in the Sloan Digital Sky Survey data release seven , Res. Astron. Astrophys. 14
Original
2014
Later among the works it cites.
S. Nesseris and S. Tsujikawa, Cosmological perturbations and observational constraints on nonlocal massive gravity , Phys. Rev. D90
Original
2014
Later among the works it cites.

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2020

Hints of dark energy anisotropic stress using Machine Learning

Arjona, Rubén, Nesseris, Savvas

Understand

Recent analyses of the Planck data and quasars at high redshifts have suggested possible deviations from the flat $\Lambda$ cold dark matter model ($\Lambda$CDM), where $\Lambda$ is the cosmological constant.

Here we use machine learning methods to investigate any possible deviations from $\Lambda$CDM at both low and high redshifts by using the latest cosmological data.
Specifically, we apply the Genetic Algorithms to explore the nature of dark energy (DE) in a model independent fashion by reconstructing its equation of state $w(z)$, the growth index of matter density perturbations $\gamma(z)$, the linear DE anisotropic stress $\eta_\textrm{DE}(z)$ and the adiabatic sound speed $c_\textrm{s,DE}^2(z)$ of DE perturbations.
We find a $\sim2\sigma$ deviation of $w(z)$ from -1 at high redshifts, the adiabatic sound speed is negative at the $\sim2.5\sigma$ level at $z=0.1$ and a $\sim2\sigma$ deviation of the anisotropic stress from unity at low redshifts and $\sim4 \sigma$ at high redshifts.