Papers › The Pantheon+ Analysis: Cosmological Constraints
The Pantheon+ Analysis: Cosmological Constraints
Dillon Brout, Dan Scolnic, Brodie Popovic, Adam G. Riess, Joe Zuntz, Rick Kessler, Anthony Carr, Tamara M. Davis, Samuel Hinton, David Jones, W. D'Arcy Kenworthy, Erik R. Peterson, Khaled Said, Georgie Taylor, Noor Ali, Patrick Armstrong, Pranav Charvu, Arianna Dwomoh, Antonella Palmese, Helen Qu, Benjamin M. Rose, Christopher W. Stubbs, Maria Vincenzi, Charlotte M. Wood, Peter J. Brown, Rebecca Chen, Ken Chambers, David A. Coulter, Mi Dai, Georgios Dimitriadis, Alexei V. Filippenko, Ryan J. Foley, Saurabh W. Jha, Lisa Kelsey, Robert P. Kirshner, Anais Möller, Jessie Muir, Seshadri Nadathur, Yen-Chen Pan, Armin Rest, Cesar Rojas-Bravo, Masao Sako, Matthew R. Siebert, Mat Smith, Benjamin E. Stahl, Phil Wiseman
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We present constraints on cosmological parameters from the Pantheon+ analysis of 1701 light curves of 1550 distinct Type Ia supernovae (SNe Ia) ranging in redshift from z=0.001 to 2.26. This work features an increased sample size, increased redshift span, and improved treatment of systematic uncertainties in comparison to the original Pantheon analysis and results in a factor of two improvement in cosmological constraining power. For a FlatΛCDM model, we find Ω_M=0.334±0.018 from SNe Ia alone. For a Flat$w_0$CDM model, we measure w₀=-0.90±0.14 from SNe Ia alone, H₀=73.5±1.1 km s⁻¹ Mpc⁻¹ when including the Cepheid host distances and covariance (SH0ES), and w₀=-0.978^(+0.024)_(-0.031) when combining the SN likelihood with constraints from the cosmic microwave background (CMB) and baryon acoustic oscillations (BAO); both w₀ values are consistent with a cosmological constant. We also present the most precise measurements to date on the evolution of dark energy in a Flat$w_0w_a$CDM universe, and measure wₐ=-0.1^(+0.9)_(-2.0) from Pantheon+ alone, H₀=73.3±1.1 km s⁻¹ Mpc⁻¹ when including SH0ES, and wₐ=-0.65^(+0.28)_(-0.32) when combining Pantheon+ with CMB and BAO data. Finally, we find that systematic uncertainties in the use of SNe Ia along the distance ladder comprise less than one third of the total uncertainty in the measurement of H₀ and cannot explain the present "Hubble tension" between local measurements and early-Universe predictions from the cosmological model.
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