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pro vyhledávání: '"781"'
Publikováno v:
Physics Letters B, Vol 781, Iss, Pp 621-625 (2018)
Physics Letters
Physics Letters
We show that a {\it massless} scalar field in a gravitational wave background can develop a non-zero vacuum expectation value. We draw comparisons to the generation of a non-zero vacuum expectation value for a scalar field in the Higgs mechanism and
Publikováno v:
Physics Letters B, Vol 781, Iss, Pp 684-687 (2018)
Physics Letters
Physics Letters
We study the cosmological evolution of the QCD axion coupled to hidden photons. For a moderately strong coupling, the motion of the axion field leads to an explosive production of hidden photons by tachyonic instability. We use lattice simulations to