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An Explanation for why the Early Universe was Dominated by the Standard Model and Stable | | Mark P. Hertzberg
; Mudit Jain
; | | Date: |
12 Nov 2019 | | Abstract: | Modern developments in quantum gravity suggest that the Standard Model (SM)
degrees of freedom are not unique; that a typical low energy effective theory
should include a large assortment of hidden sector degrees of freedom. It is
therefore puzzling that cosmological constraints from BBN and CMB reveal that
the early universe was almost entirely dominated by the SM, when the inflaton
$phi$ could have decayed into many sectors. Furthermore, the SM possesses an
instability at high scales that would be catastrophic during or just after
inflation, and yet no new physics has been seen to alter this. In this work we
propose the following explanation for all of this: the hidden sectors are in
fact entirely natural; this means all unprotected masses are pushed up to high
scales and project out of the spectrum, while only massless (or protected)
degrees of freedom remain, and so the inflaton can only reheat these sectors
through higher dimension (and suppressed) operators. On the other hand, the SM
possesses a special feature: it includes a light Higgs $H$, presumably for life
to exist, and hence it allows a super-renormalizable coupling to the inflaton
$phi, H^dagger H$, which allows rapid decay into the SM. We show that this
naturally (i) removes the instability in the Higgs potential both during and
after inflation, (ii) explains why the SM is dominant in the early universe,
(iii) allows dark matter to form in hidden sector/s through subsequent dynamics
(or axions, etc), (iv) allows for high reheating and baryogenesis, and (v)
accounts for why there so far has been no direct detection of dark matter or
new physics beyond the SM. | | Source: | arXiv, 1911.4648 | | Services: | Forum | Review | PDF | Favorites | |
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