Astronomical Distance Determination in the Space Age

Czerny, B.; Beaton, Rachael L.; Bejger, M.; Cackett, Edward M.; Dall’Ora, M.; Holanda, R. F. L.; Jensen, Joseph B.; Lusso, Elisabeta; Minezaki, Takeo; Risaliti, G.; Salaris, Maurizio; Toonen, Silvia; Yoshii, Yuzuru

doi:10.1007/978-94-024-1631-2_7

Cited by 1 publication

(1 citation statement)

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“…Future measurements of h using secondary distance indicators, e.g. the tip of the red giant branch stars (TRGB) [68] and Mira variables [69] are designed to provide independent, precise estimates (see [70] for a review). Such a plethora of different methods to measure the Hubble constant makes it an exciting time to understand possible causes of discrepancies between measurements.…”

Section: Summary and Discussionmentioning

confidence: 99%

Does the Hubble constant tension call for new physics?

Mörtsell

Dhawan

2018

J. Cosmol. Astropart. Phys.

271

189

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The Λ Cold Dark Matter model (ΛCDM) represents the current standard model in cosmology. Within this, there is a tension between the value of the Hubble constant, H 0 , inferred from local distance indicators and the angular scale of fluctuations in the Cosmic Microwave Background (CMB). We investigate whether the tension is significant enough to warrant new physics in the form of modifying or adding energy components to the standard cosmological model. We find that late time dark energy explanations are slightly disfavoured whereas a pre-CMB decoupling extra dark energy component has a marginally positive Bayesian evidence. A constant equation of state of the additional early energy density is constrained to 0.086 +0.04 −0.03 . Although this value deviates significantly from 1/3, valid for dark radiation, the latter is not disfavoured based on the Bayesian evidence. If the tension persists, future estimates of H 0 at the 1% level will be able to decisively determine which of the proposed explanations is favoured.

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Section: Summary and Discussionmentioning

confidence: 99%