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
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…
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.…
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…
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…
Two Substructures in the nearby Stellar Halo Found in Gaia and RAVE
- Hefan Li, C. Du, Yun-song Piao
- Physics, GeologyAstrophysical Journal
- 20 May 2020
We use the second Gaia data release (Gaia DR2), combined with Radial Velocity Experiment spectroscopic surveys, to identify the substructures in the nearby stellar halo. We select 3845 halo stars…
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