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Cosmological measurement of the gravitational constant G using the CMB, the BAO and the BBN

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arxiv 2407.15553 v2 pith:OJLDSSMP submitted 2024-07-22 astro-ph.CO

Cosmological measurement of the gravitational constant G using the CMB, the BAO and the BBN

Brahim Lamine , Yacob Ozdalkiran , Louis Mirouze , Furkan Erdogan , St\'ephane Ilic , Isaac Tutusaus , Raphael Kou , Alain Blanchard This is my paper
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Recent cosmological observations have provided numerous new observations with increasing precision that have led to the era of precision cosmology. The exquisite quality of these observations opens new possibilities towards measuring fundamental constants with good precision and at scales which are complementary to the laboratory ones. In particular, the cosmic microwave background (CMB) temperature and polarization spectra contain a wealth quantity of information, well beyond the basic cosmological parameters. In this paper, we update the precision on a cosmological determination of $G$ by using the latest Planck data release (PR4) in combination with the latest baryon acoustic oscillation (BAO) from the Dark Energy Spectroscopic Instrument (DESI) data release 1 and the primordial Helium fraction from BBN. We demonstrate a precision of $1.8\%$, corresponding to a $\sim25\%$ improvement compared to the literature. This measurement is compatible with laboratory ones within one standard deviation. Finally, we show that this cosmological measurement of $G$ is robust against several assumptions made on the cosmological model, in particular when considering a non-standard dark energy fluid or non-flat models.

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Cited by 2 Pith papers

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  1. Investigating a Possible Variation of the Gravitational Constant Through Gas Mass Fraction Measurements and Type Ia Supernovae Observations

    astro-ph.CO 2026-07 conditional novelty 5.5

    Non-parametric reconstruction of G(z) from cluster f_gas and Pantheon+ under L∝G^1.46 finds constant G consistent, with only mild low-z departures allowed.

  2. Gravitational particle production, the cosmological tensions and fast radio bursts

    gr-qc 2025-08 unverdicted novelty 3.0

    Gravitational vacuum polarization explains the Hubble tension by increasing direct H0 measurements while leaving indirect ones unaffected, does not impact the sigma8 tension, and predicts FRB measurements match CMB/BA...