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Mass-varying massive gravity
- Q. Huang, Yun-song Piao, Shuang-Yong Zhou
- Physics, Geology
- 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…
Cosmological evolution of a quintom model of dark energy
- Zong-Kuan Guo, Yun-song Piao, Xinmin Zhang, Yuan-zhong Zhang
- Physics, Mathematics
- 27 October 2004
TWO-FIELD MODELS OF DARK ENERGY WITH EQUATION OF STATE ACROSS -1
- Xiao-Fei Zhang, Hong Li, Yun-song 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…
Can the universe experience many cycles with different vacua
- Yun-song Piao
- Physics
- 29 July 2004
Recently, the notion that the number of vacua is astronomical has received increased attentions, which may be regarded as a possible anthropical explanation to incredibly small cosmological constant.…
Cosmological scaling solutions and cross-coupling exponential potential
- Zong-Kuan Guo, Yun-song Piao, R. Cai, Yuan-zhong Zhang
- Physics
- 25 June 2003
Proliferation in cycle
- Yun-song Piao
- Physics
- 18 January 2009
Assisted tachyonic inflation
- Yun-song Piao, R. Cai, Xinmin Zhang, Yuan-zhong Zhang
- Physics
- 11 July 2002
The model of inflation with a single tachyon field generates larger anisotropy and has difficulties in describing the formation of the Universe [L. Kofman and A. Linde, J. High Energy Phys. 07, 004…
The Effective Field Theory of nonsingular cosmology
- Yong Cai, Y. Wan, Hai-Guang Li, Taotao Qiu, Yun-song 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…
A covariant Lagrangian for stable nonsingular bounce
- Yong Cai, Yun-song Piao
- Mathematics
- 9 May 2017
A bstractThe nonsingular bounce models usually suffer from the ghost or gradient instabilities, as has been proved recently. In this paper, we propose a covariant effective theory for stable…
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