scholarly journals Implication of the Hubble tension for the primordial Universe in light of recent cosmological data

2021 ◽  
Vol 104 (6) ◽  
Author(s):  
Gen Ye ◽  
Bin Hu ◽  
Yun-Song Piao
Keyword(s):  
Cosmological Data

scholarly journals Discovery probabilities of Majorana neutrinos based on cosmological data

2021 ◽  
Vol 103 (3) ◽  
Author(s):  
M. Agostini ◽  
G. Benato ◽  
S. Dell’Oro ◽  
S. Pirro ◽  
F. Vissani
Keyword(s):  
Majorana Neutrinos ◽  
Cosmological Data

scholarly journals Primordial magnetic field limits from cosmological data

2010 ◽  
Vol 82 (8) ◽  
Author(s):  
Tina Kahniashvili ◽  
Alexander G. Tevzadze ◽  
Shiv K. Sethi ◽  
Kanhaiya Pandey ◽  
Bharat Ratra
Keyword(s):  
Magnetic Field ◽  
Cosmological Data ◽  
Primordial Magnetic Field

scholarly journals Testing standard and nonstandard neutrino physics with cosmological data

2013 ◽  
Vol 87 (4) ◽  
Author(s):  
Elena Giusarma ◽  
Roland de Putter ◽  
Olga Mena
Keyword(s):  
Neutrino Physics ◽  
Cosmological Data

scholarly journals Testing the warmness of dark matter

2019 ◽  
Vol 490 (1) ◽  
pp. 1406-1414 ◽  
Author(s):  
Suresh Kumar ◽  
Rafael C Nunes ◽  
Santosh Kumar Yadav
Keyword(s):  
Dark Matter ◽  
Cold Dark Matter ◽  
Hubble Space Telescope ◽  
Hubble Constant ◽  
Mass Scale ◽  
Acoustic Oscillations ◽  
Microwave Background ◽  
Mean Values ◽  
Λcdm Model ◽  
Cosmological Data

ABSTRACT Dark matter (DM) as a pressureless perfect fluid provides a good fit of the standard Λ cold dark matter (ΛCDM) model to the astrophysical and cosmological data. In this paper, we investigate two extended properties of DM: a possible time dependence of the equation of state of DM via Chevallier–Polarski–Linder parametrization, wdm = wdm0 + wdm1(1 − a), and the constant non-null sound speed $\hat{c}^2_{\rm s,dm}$. We analyse these DM properties on top of the base ΛCDM model by using the data from Planck cosmic microwave background (CMB) temperature and polarization anisotropy, baryonic acoustic oscillations (BAOs), and the local value of the Hubble constant from the Hubble Space Telescope (HST). We find new and robust constraints on the extended free parameters of DM. The most tight constraints are imposed by CMB+BAO data, where the three parameters wdm0, wdm1, and $\hat{c}^2_{\rm s,dm}$ are, respectively, constrained to be less than 1.43 × 10−3, 1.44 × 10−3, and 1.79 × 10−6 at 95 per cent CL. All the extended parameters of DM show consistency with zero at 95 per cent CL, indicating no evidence beyond the CDM paradigm. We notice that the extended properties of DM significantly affect several parameters of the base ΛCDM model. In particular, in all the analyses performed here, we find significantly larger mean values of H0 and lower mean values of σ8 in comparison to the base ΛCDM model. Thus, the well-known H0 and σ8 tensions might be reconciled in the presence of extended DM parameters within the ΛCDM framework. Also, we estimate the warmness of DM particles as well as its mass scale, and find a lower bound: ∼500 eV from our analyses.

scholarly journals Solar system tests of a new class of f(z) theory

2020 ◽  
Vol 29 (08) ◽  
pp. 2050060
Author(s):  
Ji-Yao Wang ◽  
Chao-Jun Feng ◽  
Xiang-Hua Zhai ◽  
Xin-Zhou Li
Keyword(s):  
Solar System ◽  
Observational Data ◽  
Ricci Scalar ◽  
Parametric Models ◽  
Alternative Models ◽  
New Class ◽  
Cosmological Data ◽  
Ppn Parameters ◽  
Models Of Gravity

Recently, a new kind of [Formula: see text] theory is proposed to provide a different perspective for the development of reliable alternative models of gravity in which the [Formula: see text] Lagrangian terms are reformulated as polynomial parametrizations [Formula: see text]. In the previous study, the parameters in the [Formula: see text] models have been constrained by using cosmological data. In this paper, these models will be tested by the observations in the solar system. After solving the Ricci scalar as a function of the redshift, one could obtain [Formula: see text] that could be used to calculate the standard Parametrized-Post-Newtonian (PPN) parameters. First, we fit the parametric models with the latest cosmological observational data. Then, the tests are performed by solar system observations. And last we combine the constraints of solar system and cosmology together and reconstruct the [Formula: see text] actions of the [Formula: see text] parametric models.

scholarly journals Physical effects involved in the measurements of neutrino masses with future cosmological data

2017 ◽  
Vol 2017 (02) ◽  
pp. 052-052 ◽  
Author(s):  
Maria Archidiacono ◽  
Thejs Brinckmann ◽  
Julien Lesgourgues ◽  
Vivian Poulin
Keyword(s):  
Neutrino Masses ◽  
Cosmological Data ◽  
Physical Effects
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