67 citations · 167 across the 16 of their papers we have counts for
16 papers
Analytic Gravitational Wave Spectrum in Next-to-Minimal Bouncing Cosmology
Changhong Li
Bouncing cosmology offers a singularity-free alternative to inflation, but its minimal realization-comprising only four cosmic phases-predicts a simple power-law stochastic gravita…
Forecast Constraints on Bouncing Cosmology from High Frequency Gravitational Waves Using Superconducting LC Circuits and Resonant Cavities
Changhong Li
We exploit forecast sensitivities to high frequency gravitational waves (HFGWs) from superconducting LC circuits, traditional resonant cavity and superconducting radio frequency (S…
Kinetically stabilized inflation
Changhong Li, Hao Gong, Yeuk-kwan Edna Cheung
In this work, we propose a string-inspired two fields inflation model to address the fine-tuning problem that the standard inflation model suffers. The fast-rolling tachyon $\mathc…
Domain Wall Network: A Dual Solution for Gravitational Waves and Hubble Tension?
Ligong Bian, Shuailiang Ge, Changhong Li +2
We explore the possibility that domain wall networks generate the stochastic gravitational wave background (SGWB) observed as a strong common power-law process in the Data Release-…
Warm and Cold Dark Matter in Bouncing Universe
Changhong Li
Being free from the initial singularity, bouncing cosmology serves as a promising alternative to inflation. However, the entropy production during the post-bounce phase is still un…
MeV Dark Matter in light of the Small Scale Crisis
Changhong Li
The small-scale crisis is one of the most outstanding puzzles in modern cosmology and astrophysics. It may imply a suppression of matter perturbation at small scale. In this work,…
Perturbative Resonance in WIMP paradigm and its Cosmological Implications on Cosmic Reheating and Primordial Gravitational Wave Detection
Changhong Li
We investigate the co-evolution of dark matter (DM) density perturbation and metric perturbation in the WIMP paradigm. Instead of adopting the conventional assumption that DM start…
Perturbative Resonance during Dark Matter Production and Its Cosmological Implications
Changhong Li
To trace the particle nature of dark matter (DM) from cosmic microwave background observations, we study the co-evolution of DM density perturbation and primordial metric perturbat…
Primordial Perturbation of Dark Matter as a Novel Probe of Very Early Universe
Changhong Li
Dark matter(DM) is the only possible candidate which would be apart from the thermal equilibrium before Big Bang nucleosynthesis(BBN) in accordance with current DM searches. In thi…
Big Bounce Genesis and Possible Experimental Tests -- A Brief Review
Yeuk-Kwan E. Cheung, Changhong Li, J. D. Vergados
We review the recent status of big bounce genesis as a new possibility of using dark matter particle's mass and interaction cross section to test the existence of a bounce universe…
Magnetized quark matter with a magnetic-field dependent coupling
Chang-Feng Li, Li Yang, Xin-Jian Wen +1
It was recently derived that the QCD running coupling is a function of the magnetic field strength under the strong magnetic field approximation. Inspired by this progress and base…
Thermal Fluctuations of Dark Matter in Bouncing Cosmology
Changhong Li
We investigate the statistical nature of the dark matter particles produced in bouncing cosmology, especially, the evolution of its thermal fluctuations. By explicitly deriving and…
Thermally Producing and Weakly Freezing-out Dark Matter in Bouncing Universe
Changhong Li
We investigate the production and freeze-out of dark matter with a constant thermally averaged cross-section in a generic bouncing universe framework. Our result shows that, there…
Big Bounce Genesis
Changhong Li, Robert H. Brandenberger, Yeuk-Kwan E. Cheung
We report on the possibility to use dark matter particle's mass and its cross section as a smoking gun signal of the existence of a Big Bounce at the early stage in the evolution o…
The Scale-invariant Power Spectrum of Primordial Curvature Perturbation in CSTB Cosmos
Changhong Li, Yeuk-Kwan E. Cheung
We investigate the spectrum of cosmological perturbations in a bounce cosmos modeled by a scalar field coupled to the string tachyon field (CSTB cosmos). By explicit computation of…
Bound to bounce: a coupled scalar-tachyon model for a smooth bouncing/cyclic universe
Changhong Li, Lingfei Wang, Yeuk-Kwan E. Cheung
We introduce a string-inspired model for a bouncing/cyclic universe, utilizing the scalar-tachyon coupling as well as contribution from curvature in a closed universe. The universe…