J
Jun Zhang
Researcher at York University
Publications - 7
Citations - 207
Jun Zhang is an academic researcher from York University. The author has contributed to research in topics: Gravitational wave & LIGO. The author has an hindex of 6, co-authored 7 publications receiving 188 citations. Previous affiliations of Jun Zhang include Chinese Academy of Sciences.
Papers
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A Galileon Design of Slow Expansion
TL;DR: In this article, the scale invariant spectrum of curvature perturbation is adiabatically induced by its increasing mode, by applying a generalized Galileon field, and the slow expansion phase ends, the available energy of field can be released and the Universe reheats.
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Are gravitational wave ringdown echoes always equal-interval?
TL;DR: It is pointed out that if the post-merger object is initially a wormhole, which slowly pinches off and eventually collapses into a black hole, the late-time ringdown waveform exhibit a series of echoes whose intervals are increasing with time.
Journal ArticleDOI
Amplification of curvature perturbations in cyclic cosmology
TL;DR: The authors analytically and numerically show that through the cycles with nonsingular bounce, the amplitude of curvature perturbation on a large scale will be amplified and the power spectrum will redden.
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Phantom inflation with a steplike potential
TL;DR: In this paper, the authors show that for the same potentials, the oscillation of the spectrum of phantom inflation is nearly same with that of normal inflation, the difference between them is the tilt of power spectrum.
Posted Content
Preheating in a DBI Inflation Model
TL;DR: In this article, the preheating process in a model of DBI inflation with a DBI-type inflaton coupling to a canonical entropy field was studied and it was shown that the field fluctuations could grow exponentially since the instability bands commonly exist in the DBI models if the amplitudes of background oscillations are of order or larger than the cutoff parameter.