Evading the axion without massless quarks
نویسندگان
چکیده
منابع مشابه
SNUTP 99-037, KIAS-P99061 Model-dependent Axion as Quintessence with Almost Massless Hidden Sector Quarks
A pseudo-Goldstone boson for quintessence is known to require the decay constant Fq ∼ MP and the height of the potential (0.003 eV)4, and hence the pseudo-Goldstone boson mass of order 10−33 eV. The modeldependent axion in some superstring models is suggested as a good candidate for the quintessence. We realize this idea with a hidden-sector gauge group SU(3)H × U(1)H . The hidden-sector instan...
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Stellar energy loss arguments lead to strong constraints on the coupling φγγ of a light axion-like particle to two photons. Helioscopes, like CAST, are able to put competitive bounds. The PVLAS experiment has recently observed a rotation of the polarization of a laser propagating in a magnetic field that can be interpreted as the effect of a quite strong φγγ coupling. We present scenarios where...
متن کاملModel-dependent Axion as Quintessence with Almost Massless Hidden Sector Quarks
A pseudo-Goldstone boson for quintessence is known to require the decay constant Fq ∼ MP and the height of the potential (0.003 eV) 4, and hence the pseudo-Goldstone boson mass of order 10−33 eV. The modeldependent axion in some superstring models is suggested as a good candidate for the quintessence. We realize this idea with a hidden-sector gauge group SU(3)H × U(1)H . The hidden-sector insta...
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It is pointed out that a natural introduction of quintessence is an axion with an almost massless quark. With an appropriate gauge or discrete symmetry, one can obtain the quintessence potential height of order (0.003 eV). Even though the QCD axion with almost massless up quark is a possibility, we stress the almost massless quark in the hidden sector together with the QCD axion toward the quin...
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Baryon and lepton number in the standard model are violated by anomalies, even though the fermions are massive. This problem is studied in the context of a two dimensional model. In a uniform background field, fermion production arise from non-adiabatic behavior that compensates for the absence of massless modes. On the other hand, for localized instanton-like configurations, there is an adiaba...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 1979
ISSN: 0556-2821
DOI: 10.1103/physrevd.19.2225