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  1. The small effective mass, which we consider here as induced by a quartic potential, then damps the scalar field into coherent oscillations around its minimum at $\sigma=0$, leading to a weaker gravitational strength at early times and naturally recovering the consistency with laboratory and Solar System tests of gravity.
    Author:Matteo Braglia, Matteo Braglia, Mario Ballardini, Mario Ballardini, Fabio Finelli, Kazuya KoyamaPublished:2021
  2. link.aps.org

    We present a model of early modified gravity (EMG) consisting in a scalar field with a nonminimal coupling to the Ricci curvature of the type plus a cosmological constant and a small effective mass and demonstrate its ability to alleviate the tension while providing a good fit to cosmic microwave background (CMB) anisotropies and baryon acoustic oscillations (BAO) data. In this model the ...
    Author:Matteo Braglia, Matteo Braglia, Mario Ballardini, Mario Ballardini, Fabio Finelli, Kazuya KoyamaPublished:2021
  3. harvest.aps.org

    The latter models have indeed been recently claimed not to be able to solve the H0tension when LSS data are included in the analysis [71-73]. As we show in this paper, the suppression of the matter power spectrum induced by thepositive coupling helpsus obtainavalue for H0larger than EDE with ξ ¼ 0, thanks to a better fit to LSS data.
  4. researchgate.net

    PDF | We present a model of Early Modified Gravity (EMG) consisting in a scalar field $\sigma$ with a non-minimal coupling to the Ricci curvature of the... | Find, read and cite all the research ...
  5. researchgate.net

    The possibility to have models with phenomenology in both the early and late universe has been tried in the context of modified gravity [20, 38], early dark sector [40], and combining modified ...
  6. ar5iv.labs.arxiv.org

    Abstract We present a model of Early Modified Gravity (EMG) consisting in a scalar field σ 𝜎 \sigma with a non-minimal coupling to the Ricci curvature of the type M pl 2 + ξ σ 2 subscript superscript 𝑀 2 pl 𝜉 superscript 𝜎 2 M^ {2}_ {\rm pl}+\xi\sigma^ {2} plus a cosmological constant and a small effective mass and demonstrate its ability to alleviate the H 0 subscript 𝐻 0 H ...
  7. inspirehep.net

    We present a model of early modified gravity (EMG) consisting in a scalar field σ with a nonminimal coupling to the Ricci curvature of the type Mpl2+ξσ2 plus a cosmological constant and a small effective mass and demonstrate its ability to alleviate the H0 tension while providing a good fit to cosmic microwave background (CMB) anisotropies and baryon acoustic oscillations (BAO) data. In ...
  8. researchgate.net

    The most recent measurements range from H 0= (67:36 0:54) km s1Mpc1for CDM and Planck 2018 data release [2] and H 0= (73:5 1:4) km s1Mpc1[3] for SH0ES, showing a 4.1˙tension on the H 0parameter.
  9. academia.edu

    We present a model of early modified gravity (EMG) consisting in a scalar field σ with a nonminimal coupling to the Ricci curvature of the type M 2 pl þ ξσ 2 plus a cosmological constant and a small effective mass and demonstrate its ability to alleviate the H 0 tension while providing a good fit to cosmic microwave background (CMB) anisotropies and baryon acoustic oscillations (BAO) data ...
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