| GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS |
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Restrictions on Purely Kinetic K-Essence |
| YANG Rong-Jia, QI Jing-Zhao, YANG Bao-Zhu
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College of Physical Science and Technology, Hebei University, Baoding 071002
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YANG Rong-Jia, QI Jing-Zhao, YANG Bao-Zhu 2011 Chin. Phys. Lett. 28 109502 |
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Abstract We restrict purely kinetic k-essence. Assuming that the equation of state is a power law of the kinetic energy, i.e. w=w0Xα, we find that α must be positive to obtain accelerated phases, constrained from the conditions for stability and causality. In this case the k-essence behaves like a phantom. We also study the evolutions of the equation of state and the speed of sound with numerical simulations.
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| Keywords:
95.36.+x
98.80.-k
98.80.Es
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Received: 09 December 2010
Published: 28 September 2011
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| PACS: |
95.36.+x
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(Dark energy)
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98.80.-k
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(Cosmology)
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98.80.Es
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(Observational cosmology (including Hubble constant, distance scale, cosmological constant, early Universe, etc))
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