Spontaneous generation of a crystalline ground state in a higher derivative theory

Subir Ghosh

Physica A: Statistical Mechanics and its Applications, 2014, vol. 407, issue C, 245-251

Abstract: The possibility of Spontaneous Symmetry Breaking in momentum space in a generic Lifshitz scalar model–a non-relativistic scalar field theory with higher spatial derivative terms–has been studied. We show that the minimum energy state, the ground state, has a lattice structure, where the translation invariance of the continuum theory is reduced to a discrete translation symmetry. The scale of translation symmetry breaking (or induced lattice spacing) is proportional to the inverse of the momentum of the condensate particle. The crystalline ground state is stable under excitations below a certain critical velocity. The small fluctuations above the ground state can have a phonon like dispersion under suitable choice of parameters.

Keywords: Spontaneous symmetry breaking; Higher derivative theory; Lifshitz scalar (search for similar items in EconPapers)
Date: 2014
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:407:y:2014:i:c:p:245-251

DOI: 10.1016/j.physa.2014.04.012

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