31 May 2023 to 2 June 2023
CERN
Europe/Zurich timezone

The Dipole of the Pantheon+SH0ES Data

1 Jun 2023, 16:50
5m
500/1-001 - Main Auditorium (CERN)

500/1-001 - Main Auditorium

CERN

400
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late universe (including CMB, dark energy, astrostatistics) Late Universe

Speaker

Francesco Sorrenti (University of Geneva)

Description

We determine the dipole in the Pantheon+ data. We find that, while its amplitude roughly agrees with the dipole found in the cosmic microwave background which is attributed to the motion of the solar system with respect to the cosmic rest frame, the direction is different at very high significance. While the amplitude depends on the lower redshift cutoff, the direction is quite stable. For redshift cuts of order $z_{\rm cut} \simeq 0.05$ and higher, the dipole is no longer detected with high statistical significant. An important rôle seems to be played by the redshift corrections for peculiar velocities.

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Primary author

Francesco Sorrenti (University of Geneva)

Presentation materials