Volume 100, Number 2, October 2012
|Number of page(s)||3|
|Section||Geophysics, Astronomy and Astrophysics|
|Published online||29 October 2012|
A simple SU(5) model with unification near the Planck scale
Institut für Physik, Albert-Ludwigs Universität Freiburg - H. Herderstr. 3, 79104 Freiburg, Germany, EU
Received: 5 August 2012
Accepted: 21 September 2012
We study unification in the SU(5) model with an extra Dirac multiplet in the 24 representation. After spontaneous symmetry breaking, we have, at low energies, a singlet, a colorless triplet and a neutral color-octet. All other particles can be taken at the unification scale. This combination leads to a unification very near the Planck scale. The triplet is light, its neutral component is a dark-matter candidate. The model is in agreement with a recently derived anomaly condition, that implies that the number of (Weyl)-fermions has to be a multiple of 16.
PACS: 95.35.+d – Dark matter (stellar, interstellar, galactic, and cosmological) / 12.10.-g – Unified field theories and models
© EPLA, 2012
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