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

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Peer-reviewed

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Article

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Authors

Wilczynska, Michael R  ORCID logo  https://orcid.org/0000-0002-4264-8038
Bainbridge, Matthew 
Barrow, John D 
Bosman, Sarah EI 

Abstract

Observations of the redshift z = 7.085 quasar J1120+0641 are used to search for variations of the fine structure constant, a, 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 a 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 (α0). The weighted mean electromagnetic force in this location in the universe deviates from the terrestrial value by Δα/α = (α z - α0)/α0 = (-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 3:9σ level.

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Keywords

5101 Astronomical Sciences, 51 Physical Sciences

Journal Title

Sci Adv

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Journal ISSN

2375-2548
2375-2548

Volume Title

6

Publisher

American Association for the Advancement of Science (AAAS)
Sponsorship
Results are based on observations collected at the European Southern Observatory, Chile, programs 286.A-5025(A), 089.A-0814(A), and 093.A-0707(A). We are grateful for the award of computing time for this research on the gStar and OzStar supercomputing facilities. MRW acknowledges support from an Australian Postgraduate Award. JKW thanks the John Templeton Foundation, the Department of Applied Mathematics and Theoretical Physics and the Institute of Astronomy at Cambridge University for hospitality and support, and Clare Hall for a Visiting Fellowship. The work of ACL and CJM was financed by FEDER—Fundo Europeu de Desenvolvimento Regional funds through the COMPETE 2020—Operational Programme for Competitiveness and Internationalisation (POCI), and by Portuguese funds through FCT—Fundação para a Ciência e a Tecnologia in the framework of the project POCI-01-0145-FEDER-028987. ACL is supported by an FCT fellowship (SFRH/BD/113746/2015), under the FCT Doctoral Program PhD::SPACE (PD/00040/2012). We thank Julian King for useful discussions. JDB thanks the STFC for support. SB acknowledges funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No. 669253). .