Multicritical Symmetry Breaking and Naturalness of Slow Nambu-Goldstone Bosons
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We investigate spontaneous global symmetry breaking in the absence of Lorentz invariance, and study technical Naturalness of Nambu-Goldstone (NG) modes whose dispersion relation exhibits a hierarchy of multicritical phenomena with Lifshitz scaling and dynamical exponents $z>1$. For example, we find NG modes with a technically natural quadratic dispersion relation which do not break time reversal symmetry and are associated with a single broken symmetry generator, not a pair. The mechanism is protected by an enhanced `polynomial shift' symmetry in the free-field limit.
Originalsprog | Engelsk |
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Tidsskrift | Physical Review D (Particles, Fields, Gravitation and Cosmology) |
Vol/bind | 88 |
Udgave nummer | 10 |
ISSN | 1550-7998 |
DOI | |
Status | Udgivet - 27 aug. 2013 |
Eksternt udgivet | Ja |
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