201 citations · 741 across the 36 of their papers we have counts for
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Primordial Gravitational Waves Spectrum in the Coupled-Scalar-Tachyon Bounce Universe
Nan Zhang, Yeuk-Kwan E. Cheung
We derive in detail the equations of motion for the tensorial modes of primordial metric perturbations in the Coupled-Scalar-Tachyon Bounce Universe. We solve for the gravitational…
The CST Bounce Universe model -- a parametric study
Yeuk-Kwan E. Cheung, Xue Song, Shuyi Li +2
A bounce universe model with a scale-invariant and stable spectrum of primordial density perturbations was constructed using a consistent truncation of the D-brane dynamics from Ty…
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…
Dualities between Scale Invariant and Magnitude Invariant Perturbation Spectra in Inflationary/Bouncing Cosmos
Chonghong Li, Yeuk-Kwan E. Cheung
We study cosmological perturbation spectra using the dynamical equations of gauge invariant perturbations with a generalized blue/red-shift term. Combined with the power-law index…
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…