2020

Cosmological model insensitivity of local $H_0$ from the Cepheid distance ladder

Dhawan, S., Brout, D., Scolnic, D. et al.

Understand

The observed tension ($\sim 9\%$ difference) between the local distance ladder measurement of the Hubble constant, $H_0$, and its value inferred from the cosmic microwave background (CMB) could hint at new, exotic, cosmological physics.

We test the impact of the assumption about the expansion history of the universe ($0.01<z<2.3$) on the local distance ladder estimate of $H_0$.
In the fiducial analysis, the Hubble flow Type Ia supernova (SN~Ia) sample is truncated to $z < 0.15$ and the deceleration parameter ($q_0$) fixed to -0.55.
We create realistic simulations of the calibrator and Pantheon samples and account for a full systematics covariance between these two sets.

Built on

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