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In models with a light scalar field (the `acceleron') coupled to neutrinos,neutrino masses depend on neutrino density. The resulting coupled system ofmass varying neutrinos (MaVaNs) and the acceleron can act as a negativepressure fluid and is a candidate for dark energy \cite{Fardon:2003eh} . MaVaNsalso allow for higher $\Sigma$m$_\nu$ than terrestrial bounds, giving lateforming warm dark matter. In this paper we study the effect of increasingneutrino mass on the CMB spectrum, implementing MaVaNs cosmology using CMBEASY.We find that the CMB spectrum is only affected at very low multipoles. Cosmicvariance allows for significant warm dark matter at late times. This impliesthat in MaVaNs cosmology $\sigma_8$ as determined by the CMB may not be a gooddeterminant of structure evolution at late times, potentially reducing thetension between $\sigma$$_{8}$ as reported by Planck Collaboration\cite{PlanckSZ:2013} without increasing the tension in the Planck determinedvalue of Hubble's constant. In addition, in MaVaNs theories, CMB data do notnecessarily constrain possible neutrino mass results in terrestrialexperiments.

Effects of Mass Varying Neutrinos on Cosmological Parameters as determined from the Cosmic Microwave Background