Baryon Asymmetry & Dark MatterNo Access

THERMAL PROPERTIES OF UNPARTICLE

SHAO-LONG CHEN

Department of Physics and Center for Theoretical Sciences, National Taiwan University, Taipei, Taiwan

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XIAO-GANG HE

Department of Physics and Center for Theoretical Sciences, National Taiwan University, Taipei, Taiwan

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XUE-PENG HU

Department of Physics, Nankai University, Tianjin 300071, China

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, and

YI LIAO

Department of Physics, Nankai University, Tianjin 300071, China

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https://doi.org/10.1142/S0217732308028065Cited by:1 (Source: Crossref)

Abstract

We report the study¹ on the thermal properties of unparticle, a scale invariant sector with a non-trivial infrared fixed point. Unparticle with scaling dimension has peculiar thermal properties due to its unique phase space structure. We find that the equation of state parameter , the ratio of pressure to energy density, is given by providing a new form of energy in our universe. In an expanding universe, the unparticle energy density evolves dramatically differently from that for photons, which makes it possible to have a large unparticle relic density today.

Keywords:

PACS: 98.80.Cq, 11.15.Tk, 11.25.Hf, 14.80.−j

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Vol. 23, No. 17n20

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THERMAL PROPERTIES OF UNPARTICLE

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