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Exploring interacting holographic dark energy in a perturbed universe with parameterized post-Friedmann approach

instabilities for cosmological perturbations [87, 88, 89]. The instability in IDE models was found by Valiviita et al. [88] (see also Ref. [89]). To solve the instability problem in the IDE cosmology, Yun-He Li

Redshift drift exploration for interacting dark energy

By detecting redshift drift in the spectra of the Lyman-\(\alpha \) forest of distant quasars, the Sandage–Loeb (SL) test directly measures the expansion of the universe, covering the “redshift desert” of \(2 \lesssim z \lesssim 5\). Thus this method is definitely an important supplement to the other geometric measurements and will play a crucial role in cosmological constraints...

Cosmological constraints on neutrinos after BICEP2

Since the B-mode polarization of the cosmic microwave background (CMB) was detected by the BICEP2 experiment and an unexpectedly large tensor-to-scalar ratio, \(r=0.20^{+0.07}_{-0.05}\), was found, the base standard cosmology should at least be extended to the 7-parameter \(\Lambda \)CDM+\(r\) model. In this paper, we consider the extensions to this base \(\Lambda \)CDM+\(r...