On the Evolution of the Hubble Constant with the SNe Ia Pantheon Sample and Baryon Acoustic Oscillations : A Feasibility Study for GRB-Cosmology in 2030
(2022) In Galaxies 10(1).- Abstract
The difference from 4 to 6 σ in the Hubble constant (H0 ) between the values observed with the local (Cepheids and Supernovae Ia, SNe Ia) and the high-z probes (Cosmic Microwave Background obtained by the Planck data) still challenges the astrophysics and cosmology community. Previous analysis has shown that there is an evolution in the Hubble constant that scales as f (z) = H0/(1 + z)η, where H0 is H0 (z = 0) and η is the evolutionary parameter. Here, we investigate if this evolution still holds by using the SNe Ia gathered in the Pantheon sample and the Baryon Acoustic Oscillations. We assume H0 = 70 km s−1 Mpc−1 as the local value and divide the... (More)
The difference from 4 to 6 σ in the Hubble constant (H0 ) between the values observed with the local (Cepheids and Supernovae Ia, SNe Ia) and the high-z probes (Cosmic Microwave Background obtained by the Planck data) still challenges the astrophysics and cosmology community. Previous analysis has shown that there is an evolution in the Hubble constant that scales as f (z) = H0/(1 + z)η, where H0 is H0 (z = 0) and η is the evolutionary parameter. Here, we investigate if this evolution still holds by using the SNe Ia gathered in the Pantheon sample and the Baryon Acoustic Oscillations. We assume H0 = 70 km s−1 Mpc−1 as the local value and divide the Pantheon into three bins ordered in increasing values of redshift. Similar to our previous analysis but varying two cosmological parameters contemporaneously (H0, Ω0m in the ΛCDM model and H0, wa in the w0waCDM model), for each bin we implement a Markov-Chain Monte Carlo analysis (MCMC) obtaining the value of H0 assuming Gaussian priors to restrict the parameters spaces to values we expect from our prior knowledge of the current cosmological models and to avoid phantom Dark Energy models with w < −1. Subsequently, the values of H0 are fitted with the model f (z). Our results show that a decreasing trend with η ∼ 10−2 is still visible in this sample. The η coefficient reaches zero in 2.0 σ for the ΛCDM model up to 5.8 σ for w0waCDM model. This trend, if not due to statistical fluctuations, could be explained through a hidden astrophysical bias, such as the effect of stretch evolution, or it requires new theoretical models, a possible proposition is the modified gravity theories, f (R). This analysis is meant to further cast light on the evolution of H0 and it does not specifically focus on constraining the other parameters. This work is also a preparatory to understand how the combined probes still show an evolution of the H0 by redshift and what is the current status of simulations on GRB cosmology to obtain the uncertainties on the Ω0m comparable with the ones achieved through SNe Ia.
(Less)
- author
- Dainotti, Maria Giovanna ; De Simone, Biagio ; Schiavone, Tiziano ; Montani, Giovanni ; Rinaldi, Enrico ; Lambiase, Gaetano ; Bogdan, Malgorzata LU and Ugale, Sahil
- organization
- publishing date
- 2022-02
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Cosmology, Evolution, Gravity, Hubble, Ia, Modified, Supernovae, Tension, Theories, ΛCDM
- in
- Galaxies
- volume
- 10
- issue
- 1
- article number
- 24
- publisher
- MDPI AG
- external identifiers
-
- scopus:85124352297
- ISSN
- 2075-4434
- DOI
- 10.3390/galaxies10010024
- language
- English
- LU publication?
- yes
- id
- a915a6b6-4721-471e-b36d-18ffbb478faa
- date added to LUP
- 2023-01-04 14:45:03
- date last changed
- 2023-01-24 14:06:52
@article{a915a6b6-4721-471e-b36d-18ffbb478faa,
abstract = {{<p>The difference from 4 to 6 σ in the Hubble constant (H<sub>0</sub> ) between the values observed with the local (Cepheids and Supernovae Ia, SNe Ia) and the high-z probes (Cosmic Microwave Background obtained by the Planck data) still challenges the astrophysics and cosmology community. Previous analysis has shown that there is an evolution in the Hubble constant that scales as f (z) = H<sub>0</sub>/(1 + z)<sup>η</sup>, where H<sub>0</sub> is H<sub>0</sub> (z = 0) and η is the evolutionary parameter. Here, we investigate if this evolution still holds by using the SNe Ia gathered in the Pantheon sample and the Baryon Acoustic Oscillations. We assume H<sub>0</sub> = 70 km s<sup>−1</sup> Mpc<sup>−1</sup> as the local value and divide the Pantheon into three bins ordered in increasing values of redshift. Similar to our previous analysis but varying two cosmological parameters contemporaneously (H<sub>0</sub>, Ω<sub>0m</sub> in the ΛCDM model and H<sub>0</sub>, w<sub>a</sub> in the w<sub>0</sub>w<sub>a</sub>CDM model), for each bin we implement a Markov-Chain Monte Carlo analysis (MCMC) obtaining the value of H<sub>0</sub> assuming Gaussian priors to restrict the parameters spaces to values we expect from our prior knowledge of the current cosmological models and to avoid phantom Dark Energy models with w < −1. Subsequently, the values of H<sub>0</sub> are fitted with the model f (z). Our results show that a decreasing trend with η ∼ 10<sup>−2</sup> is still visible in this sample. The η coefficient reaches zero in 2.0 σ for the ΛCDM model up to 5.8 σ for w<sub>0</sub>w<sub>a</sub>CDM model. This trend, if not due to statistical fluctuations, could be explained through a hidden astrophysical bias, such as the effect of stretch evolution, or it requires new theoretical models, a possible proposition is the modified gravity theories, f (R). This analysis is meant to further cast light on the evolution of H<sub>0</sub> and it does not specifically focus on constraining the other parameters. This work is also a preparatory to understand how the combined probes still show an evolution of the H<sub>0</sub> by redshift and what is the current status of simulations on GRB cosmology to obtain the uncertainties on the Ω<sub>0m</sub> comparable with the ones achieved through SNe Ia.</p>}},
author = {{Dainotti, Maria Giovanna and De Simone, Biagio and Schiavone, Tiziano and Montani, Giovanni and Rinaldi, Enrico and Lambiase, Gaetano and Bogdan, Malgorzata and Ugale, Sahil}},
issn = {{2075-4434}},
keywords = {{Cosmology; Evolution; Gravity; Hubble; Ia; Modified; Supernovae; Tension; Theories; ΛCDM}},
language = {{eng}},
number = {{1}},
publisher = {{MDPI AG}},
series = {{Galaxies}},
title = {{On the Evolution of the Hubble Constant with the SNe Ia Pantheon Sample and Baryon Acoustic Oscillations : A Feasibility Study for GRB-Cosmology in 2030}},
url = {{http://dx.doi.org/10.3390/galaxies10010024}},
doi = {{10.3390/galaxies10010024}},
volume = {{10}},
year = {{2022}},
}