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A Quintessential Axion
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abstract
The model independent axion of string theory has a decay constant of order of the Planck scale. We explore the properties of this quintessence candidate (quintaxion) in the scheme of hidden sector supergravity breakdown. In models allowing for a reasonable $\mu$ term, the hidden sector dynamics may lead to an almost flat potential responsible for the vacuum energy of $(0.003 {\rm eV})^4$. A solution to the strong CP-problem is provided by an additional hidden sector pseudoscalar (QCD axion) with properties that make it an acceptable candidate for cold dark matter of the universe.
Forward citations
Cited by 9 Pith papers
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Dark Energy and Neutrino Flavor from the Weak Axion
The dark-energy scale is predicted from neutrino masses and PMNS mixing: the weak-axion Coleman-Weinberg potential lands at 1-4 meV for current neutrino data.
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Spinoptics in the presence of axion-like particles in curved spacetime
Spinoptics equations for axion–Maxwell theory yield helicity-dependent photon trajectory corrections from both spacetime curvature and arbitrary axion profiles.
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Discretely Evanescent Dark Energy
Dark energy is proposed to be the vacuum energy of a hidden QCD-like sector, set by a topological phase, which decays in discrete membrane-nucleation steps and may vanish within roughly the current age of the universe.
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Coupled quintessence from an axion dark sector
A coupled two-axion dark sector reproduces the apparent phantom-crossing dark energy hinted at by DESI and fits CMB, BAO, and Type Ia supernova data as well as LambdaCDM.
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Wading the String Bog: CMB Birefringence in the Swampland
Ultralight-axion explanations of cosmic birefringence sit in tension with Swampland bounds, while thin axionic domain walls predict exactly isotropic birefringence, so anisotropy measurements can discriminate the alte...
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DESI constraints on two-field quintessence with exponential potentials
A two-field exponential-potential quintessence model fits DESI+CMB+SnIa data with moderate Bayesian preference over ΛCDM and slope parameters λφ≈λχ≈1.
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About electroweak domain walls in Majoron models
Electroweak instantons alone do not produce Majoron domain walls; a tiny instanton mass from B+L breaking is cosmologically negligible and can act as a bias or dark energy.
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Scalar-Induced Electromagnetic Radiation: Comparison with Axion-Like Particles and Implications for Modified Gravity
Scalar fields in scalar-tensor gravity produce EM radiation through φFμνFμν coupling with resonance amplification that differs from ALP φFμν~Fμν signals, enabling potential distinction and modified gravity tests.
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Axions as Dark Matter, Dark Energy, and Dark Radiation
A mini-review of axion phenomenology showing how light bosons can account for dark matter, drive cosmic acceleration, or contribute to relativistic backgrounds in the early and late Universe.
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