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- Michael Sitwell, Andrei Mesinger, Yin-Zhe Ma, Kris Sigurdson
- 2014

We investigate the effects of warm dark matter (WDM) on the cosmic 21-cm signal. If dark matter exists as WDM instead of cold dark matter (CDM), its non-negligible velocities can inhibit the formation of low-mass haloes that normally form first in CDM models, therefore delaying star formation. The absence of early sources delays the build-up of UV and X-ray… (More)

- Carlos Hernández-Monteagudo, Yin-Zhe Ma, +4 authors Diego Herranz
- Physical review letters
- 2015

We estimate the amount of the missing baryons detected by the Planck measurements of the cosmic microwave background in the direction of central galaxies (CGs) identified in the Sloan galaxy survey. The peculiar motion of the gas inside and around the CGs unveils values of the Thomson optical depth τ(T) in the range 0.2-2×10(-4), indicating that the regions… (More)

- Yin-Zhe Ma
- 2009

In this paper we first give a brief review of the variable cosmological constant model and its scalar field description. We mainly discuss two types of variable cosmological constant models: a power law and H power law models. A method to obtain all of the equivalent scalar field potentials and the effective equation of state of the two models are… (More)

- Yin-Zhe Ma
- 2009

In this paper we first give a brief review of the variable cosmological constant model and its scalar field description. We mainly discuss two types of variable cosmological constant models: a power law and H power law models. A method to obtain all of the equivalent scalar field potentials and the effective equation of state of the two models are… (More)

- Yin-Zhe Ma, Xin Zhang
- 2008

The holographic dark energy model is one of the important ways of dealing with the dark energy problems in the quantum gravity framework. In this model, the dimensionless parameter c plays an essential role in determining the evolution of the holographic dark energy. In particular, the holographic dark energy with c ≥ 1 can be effectively described by a… (More)

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