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Mass-varying massive gravity

- Q. Huang, Yunsong Piao, S. Zhou
- Physics
- 25 June 2012

It has recently been shown that the graviton can consistently gain a constant mass without introducing the Boulware-Deser ghost. We propose a gravity model where the graviton mass is set by a scalar… Expand

Bouncing universe with Quintom matter

- Yi-Fu Cai, Tao-tao Qiu, Yunsong Piao, Mingzhe Li, Xinmin Zhang
- Physics
- 9 April 2007

The bouncing universe provides a possible solution to the Big Bang singularity problem. In this paper we study the bouncing solution in the universe dominated by the Quintom matter with an equation… Expand

Oscillating quintom and the recurrent universe

- Bo Feng, Mingzhe Li, Yunsong Piao, Xinmin Zhang
- Physics
- 20 July 2004

Current observations seem to mildly favor an evolving dark energy with the equation of state getting across -1. This form of dark energy, dubbed quintom, is studied phenomenologically in this Letter… Expand

The Effective Field Theory of nonsingular cosmology

- Yong Cai, Youping Wan, Hai-Guang Li, Tao-tao Qiu, Yunsong Piao
- Physics
- 11 October 2016

A bstractIn this paper, we explore the nonsingular cosmology within the framework of the Effective Field Theory (EFT) of cosmological perturbations. Due to the recently proved no-go theorem, any… Expand

Cosmological evolution of a quintom model of dark energy

- Zong-Kuan Guo, Yunsong Piao, Xinmin Zhang, Y. Zhang
- Physics
- 27 October 2004

We investigate in this Letter the cosmological evolution of a dark energy model with two scalar fields where one of the scalar has canonical kinetic energy and another scalar has negative kinetic… Expand

Higher order derivative coupling to gravity and its cosmological implications

- Yong Cai, Yunsong Piao
- Physics
- 4 July 2017

We show that the R-(3)delta K operator in effective field theory is significant for avoiding the instability of nonsingular bounce, where R-(3) and K-mu nu are the three-dimensional Ricci scalar and… Expand

Obtaining the CMB anomalies with a bounce from the contracting phase to inflation

- Zhi-Guo Liu, Zong-Kuan Guo, Yunsong Piao
- Physics
- 24 April 2013

Recent Planck data show the anomalies of cosmic microwave background (CMB) fluctuations on large angular scales, which confirms the early observations by WMAP. We continue studying an inflationary… Expand

TWO-FIELD MODELS OF DARK ENERGY WITH EQUATION OF STATE ACROSS -1

- Xiao-fei Zhang, H. Li, Yunsong Piao, Xinmin Zhang
- Physics
- 29 January 2005

In this paper, we study the possibility of building two-field models of dark energy with equation of state across -1. Specifically we will consider two classes of models: one consists of two scalar… Expand

Proliferation in cycle

- Yunsong Piao
- Physics
- 18 January 2009

Abstract In the contracting phase with w ≃ 0 , the scale invariant spectrum of curvature perturbation is given by the increasing mode of metric perturbation. In this Letter, it is found that if the… Expand

Dynamical analysis of the cosmology of mass-varying massive gravity

- De-jun Wu, Yifu Cai, Yunsong Piao
- Physics
- 18 January 2013

Abstract We study cosmological evolutions of the generalized model of nonlinear massive gravity in which the graviton mass is given by a rolling scalar field and is varying along time. By performing… Expand

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