Abstract
We consider the evaporation of rotating micro black holes produced in highly energetic particle collisions, taking into account the polarization due to the coupling between the spin of the emitted particles and the angular momentum of the black hole. The effect of rotation shows up in the helicity dependent angular distribution significantly. By using this effect, there is a possibility to determine the axis of rotation for each black hole formed, suggesting a way to improve the statistics. Deviation from thermal spectrum is also a signature of rotation. This deviation is due to the fact that rapidly rotating holes have an effective temperature T eff significantly higher than the Hawking temperature T H. The deformation of the spectral shape becomes evident only for very rapidly rotating cases. We show that, since the spectrum follows a blackbody profile with an effective temperature, it is difficult to determine both the number of extra-dimensions and the rotation parameter from the energy spectrum alone. We argue that the helicity dependent angular distribution may provide a way to resolve this degeneracy. We illustrate the above results for the case of fermions.
| Original language | English |
|---|---|
| Article number | 031 |
| Journal | Journal of High Energy Physics |
| Volume | 2009 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2009 Jul 6 |
| Externally published | Yes |
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Keywords
- Phenomenology of large extra dimensions
ASJC Scopus subject areas
- Nuclear and High Energy Physics
Cite this
Spin polarization effects in micro black hole evaporation. / Flachi, Antonino; Sasaki, Misao; Tanaka, Takahiro.
In: Journal of High Energy Physics, Vol. 2009, No. 5, 031, 06.07.2009.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Spin polarization effects in micro black hole evaporation
AU - Flachi, Antonino
AU - Sasaki, Misao
AU - Tanaka, Takahiro
PY - 2009/7/6
Y1 - 2009/7/6
N2 - We consider the evaporation of rotating micro black holes produced in highly energetic particle collisions, taking into account the polarization due to the coupling between the spin of the emitted particles and the angular momentum of the black hole. The effect of rotation shows up in the helicity dependent angular distribution significantly. By using this effect, there is a possibility to determine the axis of rotation for each black hole formed, suggesting a way to improve the statistics. Deviation from thermal spectrum is also a signature of rotation. This deviation is due to the fact that rapidly rotating holes have an effective temperature T eff significantly higher than the Hawking temperature T H. The deformation of the spectral shape becomes evident only for very rapidly rotating cases. We show that, since the spectrum follows a blackbody profile with an effective temperature, it is difficult to determine both the number of extra-dimensions and the rotation parameter from the energy spectrum alone. We argue that the helicity dependent angular distribution may provide a way to resolve this degeneracy. We illustrate the above results for the case of fermions.
AB - We consider the evaporation of rotating micro black holes produced in highly energetic particle collisions, taking into account the polarization due to the coupling between the spin of the emitted particles and the angular momentum of the black hole. The effect of rotation shows up in the helicity dependent angular distribution significantly. By using this effect, there is a possibility to determine the axis of rotation for each black hole formed, suggesting a way to improve the statistics. Deviation from thermal spectrum is also a signature of rotation. This deviation is due to the fact that rapidly rotating holes have an effective temperature T eff significantly higher than the Hawking temperature T H. The deformation of the spectral shape becomes evident only for very rapidly rotating cases. We show that, since the spectrum follows a blackbody profile with an effective temperature, it is difficult to determine both the number of extra-dimensions and the rotation parameter from the energy spectrum alone. We argue that the helicity dependent angular distribution may provide a way to resolve this degeneracy. We illustrate the above results for the case of fermions.
KW - Phenomenology of large extra dimensions
UR - http://www.scopus.com/inward/record.url?scp=67649550140&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=67649550140&partnerID=8YFLogxK
U2 - 10.1088/1126-6708/2009/05/031
DO - 10.1088/1126-6708/2009/05/031
M3 - Article
VL - 2009
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
SN - 1126-6708
IS - 5
M1 - 031
ER -