Kavli Affiliate: Wayne Hu
| First 5 Authors: Rayne Liu, Rayne Liu, , ,
| Summary:
Supernova (SN) and baryon acoustic oscillation (BAO) distance measures have
recently provided hints that the dark energy is not only dynamical but
apparently evolves from normal to phantom dark energy between redshifts
$0<z<1$. A normal axion dark energy component in the mass range just below the
Hubble scale can mimic a phantom component by appearing as dark energy at $z=1$
and dark matter at $z=0$, raising the possibility of a phantom mirage. We show
that there is a wide range of axion dark energy contributions that can resolve
the SN-BAO tension as well as thawing quintessence does, leaving BAO tension
with the cosmic microwave background (CMB) for the distance measures from
$zsim 1$ to recombination to be resolved at high redshifts. With axions,
raising the optical depth to reionization to $tau approx 0.1$ works
essentially as well as $w_0-w_a$ phantom dark energy for all but the lowE CMB
data, with a remaining $Deltachi^2sim -16$ compared with $Lambda$CDM,
whereas a small spatial curvature of $Omega_K sim 0.003$ can largely relax
the full SN-BAO-CMB tension with a total $Deltachi^2 sim -12$.
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