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.
Original language | English |
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Journal | Physical Review D (Particles, Fields, Gravitation and Cosmology) |
Volume | 88 |
Issue number | 10 |
ISSN | 1550-7998 |
DOIs | |
Publication status | Published - 27 Aug 2013 |
Externally published | Yes |
Bibliographical note
5 pages, 1 figure; v2: minor typos corrected, references added
- hep-th, cond-mat.str-el, cond-mat.supr-con, gr-qc, hep-ph
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ID: 168884154