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.
Mass Generation for an Ultralight Axion
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If a global chiral symmetry is explicitly broken by anomalies in nonabelian gauge theories, a pseudo Nambu-Goldstone boson (axion) associated with a spontaneous breakdown of such a global symmetry acquires a mass through nonperturbative instanton effects. We calculate the axion mass assuming a supersymmetric SU(2) gauge theory and show that the axion obtains an extremely small mass when the SU(2) gauge symmetry is broken down at very high energy, say at the Planck scale. We identify the axion with a hypothetical ultralight boson field proposed to account for a small but nonzero cosmological constant suggested from recent cosmological observations.
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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.