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Thermal Unparticles: A New Form of Energy Density in the Universe

This study explores the concept of unparticles, a new form of energy density in the universe, and their thermodynamic properties. Unparticles are intriguing due to their scale invariance and unique propagator. The research delves into various aspects of unparticle physics, from precision tests to cosmological implications. The thermodynamics of a gas of bosonic unparticles with mass parameter μ is examined, shedding light on their behavior in different scenarios, including an expanding universe and their interaction with Big Bang Nucleosynthesis. This work contributes to the evolving understanding of fundamental physics and cosmology.

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Thermal Unparticles: A New Form of Energy Density in the Universe

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  1. Thermal Unparticles: A New Form of Energy Density in the Universe Nankai University Hu xuepeng Shao-Long Chen (Taiwan, Natl. Taiwan U.) , Xiao-Gang He (Taiwan, Natl. Taiwan U. & Nankai U.) , Xue-Peng Hu, Yi Liao (Nankai U.) . arXiv:0710.5129 

  2. 1. Original idea due to Georgi • Unparticle physics Phys.Rev.Lett.98:221601,2007 （hep-ph/0703260） • Another Odd Thing About Unparticle Physics • Phys.Lett.B650:275-278,2007 （0704.2457[hep-ph]）

  3. The very high energy theory contains the fields of the standard model and the fields(Banks-Zaks fields) of a theory with a nontrivial IR fixed point.

  4. The most important properties of unparticle • 1 Scale invar. -->the state density of unparticle • 2 the propagator of unparticle is

  5. There has been a burst of activities since the seminal work of Georgi on various aspects of unparticle physics: • FCNC Effects – Precision B physics • collider effects – LHC era • precision QED tests – Any new idea must pass! • unitarity issue of gauge boson scattering • theoretical issues: interpretation of unparticles in terms of particles • cosmology and astrophysics • and so on

  6. 2. The thermodynamics of unparticle • The thermodynamics of a gas of bosonic particles with mass μ is determined by the partition function: • where accounts for degrees offreedom like spin.

  7. we can interpret ( 1 ) in terms of a continuous collection of particles with the help of a spectral function :

  8. partition function for unparticles is

  9. 3. unparticle in expanding universe

  10. 3.1 minimal decoupling temperature

  11. 3.2 deof nparticle vs.BBN

  12. Thanks!

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