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Constraint on a varying proton-electron mass ratio 1.5 billion years after the big bang.
Bagdonaite, J; Ubachs, W; Murphy, M T; Whitmore, J B.
Affiliation
  • Bagdonaite J; Department of Physics and Astronomy, and LaserLaB, VU University, De Boelelaan 1081, 1081 HV Amsterdam, Netherlands.
  • Ubachs W; Department of Physics and Astronomy, and LaserLaB, VU University, De Boelelaan 1081, 1081 HV Amsterdam, Netherlands.
  • Murphy MT; Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Melbourne, Victoria 3122, Australia.
  • Whitmore JB; Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Melbourne, Victoria 3122, Australia.
Phys Rev Lett ; 114(7): 071301, 2015 Feb 20.
Article in En | MEDLINE | ID: mdl-25763949
ABSTRACT
A molecular hydrogen absorber at a lookback time of 12.4 billion years, corresponding to 10% of the age of the Universe today, is analyzed to put a constraint on a varying proton-electron mass ratio, µ. A high resolution spectrum of the J1443+2724 quasar, which was observed with the Very Large Telescope, is used to create an accurate model of 89 Lyman and Werner band transitions whose relative frequencies are sensitive to µ, yielding a limit on the relative deviation from the current laboratory value of Δµ/µ=(-9.5 ± 5.4(stat)± 5.3(syst))×10(-6).
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Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2015 Type: Article Affiliation country: Netherlands
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Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2015 Type: Article Affiliation country: Netherlands