Regular Article - Theoretical Physics
Standard model with partial gauge invariance
Center for Elementary Particle Physics, ITP, Ilia State University, 0162, Tbilisi, Georgia
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Revised: 24 January 2012
Published online: 23 March 2012
We argue that an exact gauge invariance may disable some generic features of the Standard Model which could otherwise manifest themselves at high energies. One of them might be related to the spontaneous Lorentz invariance violation (SLIV), which could provide an alternative dynamical approach to QED and Yang–Mills theories with photon and non-Abelian gauge fields appearing as massless Nambu–Goldstone bosons. To see some key features of the new physics expected we propose partial rather than exact gauge invariance in an extended SM framework. This principle applied, in some minimal form, to the weak hypercharge gauge field B μ and its interactions, leads to SLIV with B field components appearing as the massless Nambu–Goldstone modes, and provides a number of distinctive Lorentz breaking effects. Being naturally suppressed at low energies they may become detectable in high energy physics and astrophysics. Some of the most interesting SLIV processes are considered in significant detail.
© Springer-Verlag / Società Italiana di Fisica, 2012