Abstract The standard Λ Cold Dark Matter (ΛCDM) cosmological model provides a good
description of a wide range of astrophysical and cosmological data. However, there are a …

Various pulsar timing array (PTA) experiments (NANOGrav, EPTA, PPTA, CPTA, including
data from InPTA) very recently reported evidence for excess red common-spectrum signals …

We revisit the possibility that the stochastic common-spectrum process recently detected by
the NANOGrav pulsar timing array experiment could be due to primordial gravitational …

The out-of-time-ordered correlation (OTOC) function is an important new probe in quantum
field theory which is treated as a significant measure of random quantum correlations. In this …

We analyze the H 0-tension problem in the context of models of the early universe that
predict a blue tilted spectrum of primordial gravitational waves (GWs), which is a positive …

We study the quantum circuit complexity of cosmological perturbations in different models of
the early universe. A natural measure for the complexity of cosmological perturbations is …

The effective approach in loop quantum cosmology (LQC) has provided means to obtain
predictions for observable quantities in LQC models. While an effective dynamics in LQC …

We investigate scalar particle creation in a set of bouncing models where the bounce occurs
due to quantum cosmological effects described by the Wheeler-DeWitt equation. The scalar …

We study and estimate probabilistic predictions for the duration of the preinflationary and
slow-roll phases after the bounce in loop quantum cosmology, determining how the …

We review the recent status of big bounce genesis as a new possibility of using dark matter
particles' mass and interaction cross-section to test the existence of a bounce universe at the …