Regular Article - Theoretical Physics
Running of the spectral index in deformed matter bounce scenarios with Hubble-rate-dependent dark energy
Department of Physics, Faculty of Science, Bu-Ali Sina University, Hamedan, 65178, Iran
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Accepted: 11 March 2018
Published online: 21 March 2018
As a deformed matter bounce scenario with a dark energy component, we propose a deformed one with running vacuum model (RVM) in which the dark energy density is written as a power series of and with a constant equation of state parameter, same as the cosmological constant, . Our results in analytical and numerical point of views show that in some cases same as CDM bounce scenario, although the spectral index may achieve a good consistency with observations, a positive value of running of spectral index () is obtained which is not compatible with inflationary paradigm where it predicts a small negative value for . However, by extending the power series up to , , and estimating a set of consistent parameters, we obtain the spectral index , a small negative value of running and tensor to scalar ratio r, which these reveal a degeneracy between deformed matter bounce scenario with RVM-DE and inflationary cosmology.
© The Author(s), 2018