Abstract
Constraints on inflationary models typically assume only the standard models of cosmology and particle physics. By extending the neutrino sector to include a new interaction with a light scalar mediator ($m_{\phi}\sim$MeV), it is possible to relax these constraints, in particular via opening up regions of the parameter space of the spectral index $n_s$. These new interactions can be probed at IceCube via interactions of astrophysical neutrinos with the Cosmic Neutrino Background for nearly all of the relevant parameter space.
Highlights
The success of the the Big Bang Theory is evident due to the incredible agreement between the model and the anisotropies in the Cosmic Microwave Background (CMB)
By extending the neutrino sector to include a new interaction with a light scalar mediator, it is possible to relax these constraints, in particular via opening up regions of the parameter space of the spectral index ns
These new interactions can be probed at IceCube via interactions of astrophysical neutrinos with the Cosmic Neutrino Background for most of the relevant parameter space
Summary
The success of the the Big Bang Theory is evident due to the incredible agreement between the model and the anisotropies in the Cosmic Microwave Background (CMB). It has since been shown that some regions of ns parameter space can be allowed by including new neutrino interactions [2,3,4] 1. In this paper we explore the neutrino phenomenology involved in opening up the parameter space to models of inflation previously thought to be ruled out. This new interaction will cause high energy (∼TeVPeV) neutrinos traveling astrophysical distances to resonantly scatter and lose energy off the Cosmic Neutrino Background (CνB). We look at how cosmology is modified by such a new interaction in section III and derive the allowed region in parameter space by performing a Markov Chain Monte Carlo (MCMC) analysis.
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