| DATE: |
2008-03-10 14:00 - 15:00 |
| PLACE: |
Kenkyu Honkan 2F RM 220 |
| TITLE: |
Unparticle and its thermal properties |
| CONTACT: |
tsuda |
| SPEAKER: |
Dr. Shaolong Chen (National Taiwan University) |
| LANGUAGE: |
English |
| ABSTRACT: |
The unparticles due to H. Georgi describe the low energy physics of a non-trivial scale invariant sector. We study interactions of unparticles with Standard Model (SM) fields through effective operators. Since unparticles come from beyond the SM physics, it is plausible that they transform as a singlet under the SM gauge group. This helps tremendously in limiting possible interactions. We analyze interactions of scalar , vector and spinor unparticles with SM fields and derivatives up to dimension four. Using these operators, we discuss different features of producing unparticles at ee collider and other phenomenologies. Unparticle with scaling dimension d 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 1/(2d + 1) providing a new form of energy in our universe. |
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