Kavli Affiliate: Eiichiro Komatsu
| First 5 Authors: Jonathan C. Tan, Jonathan C. Tan, , ,
| Summary:
The Population III.1 theory for supermassive black hole (SMBH) formation
predicts a very early ($zsim20-25$), transient phase, “The Flash”, of cosmic
reionization powered by supermassive stars that are SMBH progenitors. The
universe then quickly recombined to become mostly neutral, with this state
persisting until galaxies begin to reionize intergalactic gas again at $zsim
10$. The overall Thomson scattering optical depth, $tau$, from The Flash has
been shown to be $tau_rm PopIII.1sim0.03$, leading to a total
$tausim0.08-0.09$. Such a value, while significantly larger than that
previously inferred from it Planck observations of the low-$l$ $EE$
polarization power spectrum of the CMB, can help relieve several “tensions”
faced by the standard $Lambda$CDM cosmological model, especially the
preference for negative neutrino masses and dynamic dark energy. Here we
compute $EE$ power spectra of example models of The Flash. We find that,
because of its very high redshift, the contribution to $llesssim8$ modes is
dramatically reduced compared to usual low-$z$ reionization models for the same
value of $tau$, while the power at $lgtrsim8$ is boosted. Thus the Pop III.1
reionization scenario provides a natural way to increase $tau$, while
remaining closer to the latest CMB low-$l$ polarization observations.
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