Spin polarization effects in micro black hole evaporation

Antonino Flachi, Misao Sasaki, Takahiro Tanaka

Research output: Contribution to journalArticle

8 Citations (Scopus)

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 languageEnglish
Article number031
JournalJournal of High Energy Physics
Volume2009
Issue number5
DOIs
Publication statusPublished - 2009 Jul 6
Externally publishedYes

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evaporation
polarization
angular distribution
deviation
particle collisions
axes of rotation
energetic particles
temperature
energy spectra
angular momentum
fermions
signatures
statistics
profiles

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 journalArticle

Flachi, Antonino ; Sasaki, Misao ; Tanaka, Takahiro. / Spin polarization effects in micro black hole evaporation. In: Journal of High Energy Physics. 2009 ; Vol. 2009, No. 5.
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