Search Publications
Evolution of the f σ8 tension with the Planck15 /Λ CDM determination and implications for modified gravity theories
Kazantzidis, Lavrentios; Perivolaropoulos, Leandros
We construct an updated extended compilation of distinct (but possibly correlated) f σ8(z ) redshift space distortion (RSD) data published between 2006 and 2018. It consists of 63 datapoints and is significantly larger than previously used similar data sets. After fiducial model correction we obtain the best fit Ω0 m-σ8<…
Reducing the H0 and σ8 tensions with dark matter-neutrino interactions
Di Valentino, Eleonora; Bœhm, Céline; Bouchet, François R. +1 more
The introduction of dark matter-neutrino interactions modifies the cosmic microwave background (CMB) angular power spectrum at all scales, thus affecting the reconstruction of the cosmological parameters. Such interactions can lead to a slight increase of the value of H0 and a slight decrease of S8≡σ8√{Ωm
Implications of an extended dark energy cosmology with massive neutrinos for cosmological tensions
Kamionkowski, Marc; Boddy, Kimberly K.; Poulin, Vivian +1 more
We perform a comprehensive analysis of the most common early- and late-universe solutions to the H0 , Ly -α , and S8 discrepancies. When considered on their own, massive neutrinos provide a natural solution to the S8 discrepancy at the expense of increasing the H0 tension. If all extensions are considere…
Vacuum phase transition solves the H0 tension
Di Valentino, Eleonora; Melchiorri, Alessandro; Linder, Eric V.
Taking the Planck cosmic microwave background data and the more direct Hubble constant measurement data as unaffected by systematic offsets, the values of the Hubble constant H0 interpreted within the Λ CDM cosmological constant and cold dark matter cosmological model are in ∼3.3 σ tension. We show that the Parker vacuum metamorphosis (…
Large-scale stability and astronomical constraints for coupled dark-energy models
Yang, Weiqiang; Pan, Supriya; Barrow, John D.
We study large-scale inhomogeneous perturbations and instabilities of interacting dark-energy models. Past analysis of large-scale perturbative instabilities has shown that we can only test interacting dark-energy models with observational data when their parameter ranges are either wx≥-1 and ξ ≥0 , or wx≤-1 and ξ ≤0 , where …
Indirect detection of neutrino portal dark matter
Batell, Brian; Han, Tao; Shams Es Haghi, Barmak
We investigate the feasibility of the indirect detection of dark matter in a simple model using the neutrino portal. The model is very economical, with right-handed neutrinos generating neutrino masses through the type-I seesaw mechanism and simultaneously mediating interactions with dark matter. Given the small neutrino Yukawa couplings expected …
Updated tomographic analysis of the integrated Sachs-Wolfe effect and implications for dark energy
Bilicki, Maciej; Lesgourgues, Julien; Cuoco, Alessandro +1 more
We derive updated constraints on the integrated Sachs-Wolfe (ISW) effect through cross-correlation of the cosmic microwave background with galaxy surveys. We improve with respect to similar previous analyses in several ways. First, we use the most recent versions of extragalactic object catalogs, SDSS DR12 photometric redshift (photo-z ) and 2MASS…
Do current cosmological observations rule out all covariant Galileons?
Peirone, Simone; Frusciante, Noemi; Hu, Bin +2 more
We revisit the cosmology of covariant Galileon gravity in view of the most recent cosmological data sets, including weak lensing. As a higher derivative theory, covariant Galileon models do not have a Λ CDM limit and predict a very different structure formation pattern compared with the standard Λ CDM scenario. Previous cosmological analyses sugge…
Two-halo term in stacked thermal Sunyaev-Zel'dovich measurements: Implications for self-similarity
Hill, J. Colin; Jain, Bhuvnesh; Greco, Johnny P. +2 more
The relation between the mass and integrated electron pressure of galaxy group and cluster halos can be probed by stacking maps of the thermal Sunyaev-Zel'dovich (tSZ) effect. Perhaps surprisingly, recent observational results have indicated that the scaling relation between integrated pressure and mass follows the prediction of simple, self-simil…
Price of shifting the Hubble constant
Evslin, Jarah; Ruchika; Sen, Anjan A.
An anisotropic measurement of the baryon acoustic oscillation (BAO) feature fixes the product of the Hubble constant and the acoustic scale H0rd. Therefore, regardless of the dark energy dynamics, to accommodate a higher value of H0 one needs a lower rd and so necessarily a modification of early time cos…