# Model-independent cosmological constraints from growth and expansion

@article{LHuillier2017ModelindependentCC, title={Model-independent cosmological constraints from growth and expansion}, author={Benjamin L’Huillier and Arman Shafieloo and Hyungjin Kim Kasi and Ust and Waterloo}, journal={Monthly Notices of the Royal Astronomical Society}, year={2017}, volume={476}, pages={3263-3268} }

Reconstructing the expansion history of the Universe from type Ia supernovae data, we fit the growth rate measurements and put model-independent constraints on some key cosmological parameters, namely, $\Omega_\mathrm{m},\gamma$, and $\sigma_8$. The constraints are consistent with those from the concordance model within the framework of general relativity, but the current quality of the data is not sufficient to rule out modified gravity models. Adding the condition that dark energy density…

## 30 Citations

### Defying the laws of gravity I: model-independent reconstruction of the Universe expansion from growth data

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- 2019

Using redshift space distortion data, we perform model-independent reconstructions of the growth history of matter inhomogeneity in the expanding Universe using two methods: crossing statistics and…

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We reconstruct the expansion history of the universe using type Ia supernovae (SN Ia) in a manner independent of any cosmological model assumptions. To do so, we implement a nonparametric iterative…

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### Model-independent Reconstruction of Dark Energy Density from Current Observations

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The evolution of the dark energy (DE) density is a crucial quantity for understanding the nature of DE. Often, the quantity is described by the so-called equation of state; that is, the ratio of the…

### Nonparametric modeling of cosmological database on the χ2 distribution

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In the ΛCDM model, cosmological observations from the late and recent universe reveal a puzzling ∼ 4.5σ tension in the current rate of universe expansion. In addition to the various scenarios…

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- PhysicsJournal of Cosmology and Astroparticle Physics
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We present a systematic analysis of the cosmological constraints from the “Pantheon Sample” of 1048 Type Ia Supernovae (SNe Ia) in the redshift range 0.01<z<2.3 compiled by Scolnic et al. (2018).…

### Impact of the Universe’s expansion rate on constraints on modified growth of structure

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In the context of modiﬁed gravity, at linear level, the growth of structure in the Universe will be affected by modiﬁcations to the Poisson equation and by the background expansion rate of the…

### Model-independent cosmic acceleration and type Ia supernovae intrinsic luminosity redshift dependence

- Physics
- 2018

The $\Lambda$CDM model is the current standard model in cosmology thanks to its ability to reproduce the observations. Its first observational evidence appeared from the type Ia supernovae (SNIa)…

### Null tests of the standard model using the linear model formalism

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- 2017

We test both the FLRW geometry and $\Lambda$CDM cosmology in a model independent way by reconstructing the Hubble function $H(z)$, the comoving distance $D(z)$ and the growth of structure…

### Falsifying ΛCDM : Model-independent tests of the concordance model with eBOSS DR14Q and Pantheon

- PhysicsPhysical Review D
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