Kinetic backreaction from an ultralight axion condensate always increases the kinetic coupling f(χ), so the Jeans length grows and quantum pressure cannot be dynamically suppressed.
Towards a Dark Sector Model from String Theory
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An embedding of a unified dark sector model into string theory with the following features is proposed: The model-independent axion descending from the Kalb-Ramond 2-form field is identified with the dark-matter field, and the real part of a K\"ahler modulus field -- the ``radius'' of one of the extra spatial dimensions -- accounts for dark energy. The expectation value of the dilaton field is stabilized by a gaugino condensation mechanism. A dark-energy potential corresponding to a realistic low energy scale results from some gentle tuning of the stabilized expectation value of the dilaton. The resulting potential reproduces the one in a previous dark-sector model proposed by two of us.
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Kinetic backreaction cannot suppress axion quantum pressure
Kinetic backreaction from an ultralight axion condensate always increases the kinetic coupling f(χ), so the Jeans length grows and quantum pressure cannot be dynamically suppressed.