More on Emergent Dark Energy from Unparticles
arXiv:2111.09946 · doi:10.1103/PhysRevD.106.083502
Abstract
In a recent paper \cite{Artymowski:2020zwy} we suggested the possibility that the present acceleration of the Universe is due to thermodynamical behavior of unparticles. The model is free of scalar fields, modified gravity, a Cosmological Constant (CC), the coincidence problem, initial conditions problem and possesses interesting distinct predictions regarding the equation of state of Dark Energy, the growth rate and the number of relativistic degrees of freedom at BBN and CMB decoupling. In this work, we relate to a recent paper \cite{Abchouyeh:2021wey}, which discusses a similar setup of unparticles with and without a CC as an external source of late-time acceleration. The authors have shown how such a model is inconsistent with the data. We show that these claims are viable only in a particular part of the parameter space and that model \cite{Artymowski:2020zwy} stands tall. We further suggest a consistency condition in terms of observables. We then fit publicly available supernovae data to derive the expected Hubble parameter and constrain the parameters of the model.
9 pages, 9 figures
References in corpus (10)
- Dynamics of dark energy
- Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests
- Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM
- Unparticle Physics
- Do stochastic inhomogeneities affect dark-energy precision measurements?
- Backreaction on the luminosity-redshift relation from gauge invariant light-cone averaging
- Constraints on Scalar and Tensor spectra from
- Unparticle dark energy
- Cosmology at high redshift -- a probe of fundamental physics
- Lensing dispersion of SNIa and small scales of the primordial power spectrum