Four direct measurements of the fine-structure constant 13 billion years ago.

ABSTRACT: Observations of the redshift z = 7.085 quasar J1120+0641 are used to search for variations of the fine structure constant, ?, over the redshift range 5.5 to 7.1. Observations at z = 7.1 probe the physics of the universe at only 0.8 billion years old. These are the most distant direct measurements of ? to date and the first measurements using a near-IR spectrograph. A new AI analysis method is employed. Four measurements from the x-shooter spectrograph on the Very Large Telescope (VLT) constrain changes in a relative to the terrestrial value (?0). The weighted mean electromagnetic force in this location in the universe deviates from the terrestrial value by ??/? = (? z - ?0)/?0 = (-2.18 ± 7.27) × 10-5, consistent with no temporal change. Combining these measurements with existing data, we find a spatial variation is preferred over a no-variation model at the 3.9? level.

SUBMITTER: Wilczynska MR 

PROVIDER: S-EPMC7182409 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature