Papers › Primordial Bounce-Inflation Scenario to Alleviate Cosmological Tensions and Lensing Anomaly
Primordial Bounce-Inflation Scenario to Alleviate Cosmological Tensions and Lensing Anomaly
Hao-Hao Li, Xin-zhe Zhang, Taotao Qiu
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We put forward a primordial scenario to alleviate cosmological tensions, i.e. Hubble (H₀) tension and S₈ tension. Based on flat ΛCDM, the Bounce-Inflation (BI) scenario gives the results that H₀ = 68.60^(+0.40)_(-0.45) km/s/Mpc, S₈ = 0.806 ±0.011 by using \texttt{Planck 2018} data sets and H₀ = 68.96 ±0.38 km/s/Mpc, S₈ = 0.797±0.010 by using \texttt{Planck 2018} + \texttt{SPT3G} data sets. These reduce the cosmological tensions slightly. We also take an extended ΛCDM model into account, ΛCDM (BI)+A_L, where A_L is the gravitational lensing amplitude. The results are H₀ = 69.38 ±0.49 km/s/Mpc, S₈ = 0.774 ±0.014 fitted by \texttt{Planck 2018} data sets and H₀ = 69.49 ±0.45 km/s/Mpc, S₈ = 0.771^(+0.013)_(-0.012) fitted by \texttt{Planck 2018} + \texttt{SPT3G} data sets, which reduce the Hubble tension to ∼3σ level and show no S₈ tension. The A_L ≈1.1 is smaller than the result of the inflation scenario with a constraint of \texttt{Planck 2018} data sets. Besides, the spectral index of the bounce-inflation scenario nₛ is about 0.98, with a trend to the Harrison-Zel'dovich spectrum.
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