Dice Question Streamline Icon: https://streamlinehq.com

Persistence of the Hubble tension

Ascertain whether the Hubble tension—the discrepancy between direct local measurements of the Hubble constant and the value inferred from the cosmic microwave background—persists, and determine for how long it remains unresolved by forthcoming observations.

Information Square Streamline Icon: https://streamlinehq.com

Background

The Hubble tension reflects a long-standing discrepancy between local determinations of H0 and values inferred from the CMB within the standard cosmological model. Its status has substantial implications for cosmology and potential new physics.

The authors explicitly note uncertainty about the longevity of this tension and point to gravitational-wave standard sirens as an independent probe that could clarify the situation.

References

Several tensions have been claimed over the years, but undoubtedly the most advertised one is the "Hubble tension" , reporting a disagreement between the measurement of the local expansion rate and the inferred value of $H_0$ from the CMB. It is unclear how long this tension will last, but, as we will see later, GW standard siren cosmology will provide a new way of precisely measuring the Universe's expansion rate.

— Cosmography with next-generation gravitational wave detectors (2402.03120 - Chen et al., 5 Feb 2024) in Section 3.3 (Cosmology landscape in 2035+)