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- W4304193722 abstract "Testing the cosmological variation of fundamental constants of nature can provide valuable insights into new physics scenarios. While many such constraints have been derived for standard model coupling constants and masses, the θ[over ¯] parameter of QCD has not been as extensively examined. In this Letter, we discuss potentially promising paths to investigate the time dependence of the θ[over ¯] parameter. While laboratory searches for CP-violating signals of θ[over ¯] yield the most robust bounds on today's value of θ[over ¯], we show that CP-conserving effects provide constraints on the variation of θ[over ¯] over cosmological timescales. We find no evidence for a variation of θ[over ¯] that could have implied an iron-deficient Universe at higher redshifts. By converting recent atomic clock constraints on a variation of constants, we infer d(θ[over ¯]^{2})/dt≤6×10^{-15} yr^{-1}, at 1σ. Finally, we also sketch an axion model that results in a varying θ[over ¯] and could lead to excess diffuse gamma ray background, from decays of axions produced in high redshift supernova explosions." @default.
- W4304193722 created "2022-10-11" @default.
- W4304193722 creator A5060292472 @default.
- W4304193722 creator A5073208785 @default.
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- W4304193722 date "2022-10-11" @default.
- W4304193722 modified "2023-09-26" @default.
- W4304193722 title "Is the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mover accent=true><mml:mrow><mml:mi>θ</mml:mi></mml:mrow><mml:mrow><mml:mo stretchy=false>¯</mml:mo></mml:mrow></mml:mover></mml:mrow></mml:math> Parameter of QCD Constant?" @default.
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- W4304193722 doi "https://doi.org/10.1103/physrevlett.129.161802" @default.
- W4304193722 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36306742" @default.
- W4304193722 hasPublicationYear "2022" @default.
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