منابع مشابه
{ 1{ Axions and Other Very Light Bosons Axions and Other Very Light Bosons, Part I (theory)
(by H. Murayama) In this section we list limits for very light neutral (pseudo) scalar bosons that couple weakly to stable matter. They arise if there is a global continuous symmetry in the theory that is spontaneously broken in the vacuum. If the symmetry is exact, it results in a massless Nambu{Goldstone (NG) boson. If there is a small explicit breaking of the symmetry, either already in the ...
متن کاملConstraints on Very Light Axions from Cavity Experiments
In view of the ongoing galactic (or cosmic) axion detection experiments, we compare the axion-photon-photon coupling caγγ ’s for various invisible (or very light) axion models. 11.40-q, 95.35+d, 12.60 Fr Typeset using REVTEX ∗Permanent address 1 The θ̄ parameter of the standard model is naturally understood in axion models [1]. This axion interpretation has led to the very light (or invisible) a...
متن کاملAxions and Other Very Light Bosons
In this section we list limits for very light neutral (pseudo) scalar bosons that couple weakly to stable matter. They arise if there is a global continuous symmetry in the theory that is spontaneously broken in the vacuum. If the symmetry is exact, it results in a massless Nambu–Goldstone (NG) boson. If there is a small explicit breaking of the symmetry, either already in the Lagrangian or due...
متن کاملAxions from wall decay
We discuss the decay of axion walls bounded by strings and present numerical simulations of the decay process. In these simulations, the decay happens immediately, in a time scale of order the light travel time, and the average energy of the radiated axions is 〈ωa〉 ≃ 7ma for va/ma ≃ 500. 〈ωa〉 is found to increase approximately linearly with ln(va/ma). Extrapolation of this behaviour yields 〈ωa〉...
متن کاملAxions from String Decay
We have studied numerically the evolution and decay of axion strings. These global defects decay mainly by axion emission and thus contribute to the cosmological axion energy density. The relative importance of this source relative to misalignment production of axions depends on the spectrum. Radiation spectra for various string loop configurations are presented. They support the contention tha...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2019
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.122.081101