Effective Minkowski-to-Euclidean signature change of the magnon BEC pseudo-Goldstone mode in polar 3He

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

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Effective Minkowski-to-Euclidean signature change of the magnon BEC pseudo-Goldstone mode in polar 3He. / Nissinen, Jaakko; Volovik, Grigory.

julkaisussa: JETP Letters, Vuosikerta 106, Nro 4, 14.08.2017, s. 234–241.

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

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Bibtex - Lataa

@article{b28dfff4947b41d5be58357143b9e6fb,
title = "Effective Minkowski-to-Euclidean signature change of the magnon BEC pseudo-Goldstone mode in polar 3He",
abstract = "We discuss the effective metric experienced by the Nambu–Goldstone mode propagating in the broken symmetry spin-superfluid state of coherent precession of magnetization. This collective mode represents the phonon in the RF driven or pulsed out-of-equilibrium Bose–Einstein condensate (BEC) of optical magnons. We derive the effective BEC free energy and consider the phonon spectrum when the spin superfluid BEC is formed in the anisotropic polar phase of superfluid 3He, experimentally observed in uniaxial aerogel 3He-samples. The coherent precession of magnetization experiences an instability at a critical value of the tilting angle of external magnetic field with respect to the anisotropy axis. From the action of quadratic deviations around equilibrium, this instability is interpreted as a Minkowski-to-Euclidean signature change of the effective phonon metric. We also note the similarity between the magnon BEC in the unstable region and an effective vacuum scalar “ghost” condensate.",
keywords = "magnon BEC, effective metric, Polar 3He",
author = "Jaakko Nissinen and Grigory Volovik",
note = "| openaire: EC/H2020/694248/EU//TOPVAC",
year = "2017",
month = "8",
day = "14",
doi = "10.1134/S0021364017160032",
language = "English",
volume = "106",
pages = "234–241",
journal = "JETP LETTERS / PISMA V ZHURNAL EKSPERIMENTALNOI I TEORETICHESKOI FIZIKI",
issn = "0021-3640",
number = "4",

}

RIS - Lataa

TY - JOUR

T1 - Effective Minkowski-to-Euclidean signature change of the magnon BEC pseudo-Goldstone mode in polar 3He

AU - Nissinen, Jaakko

AU - Volovik, Grigory

N1 - | openaire: EC/H2020/694248/EU//TOPVAC

PY - 2017/8/14

Y1 - 2017/8/14

N2 - We discuss the effective metric experienced by the Nambu–Goldstone mode propagating in the broken symmetry spin-superfluid state of coherent precession of magnetization. This collective mode represents the phonon in the RF driven or pulsed out-of-equilibrium Bose–Einstein condensate (BEC) of optical magnons. We derive the effective BEC free energy and consider the phonon spectrum when the spin superfluid BEC is formed in the anisotropic polar phase of superfluid 3He, experimentally observed in uniaxial aerogel 3He-samples. The coherent precession of magnetization experiences an instability at a critical value of the tilting angle of external magnetic field with respect to the anisotropy axis. From the action of quadratic deviations around equilibrium, this instability is interpreted as a Minkowski-to-Euclidean signature change of the effective phonon metric. We also note the similarity between the magnon BEC in the unstable region and an effective vacuum scalar “ghost” condensate.

AB - We discuss the effective metric experienced by the Nambu–Goldstone mode propagating in the broken symmetry spin-superfluid state of coherent precession of magnetization. This collective mode represents the phonon in the RF driven or pulsed out-of-equilibrium Bose–Einstein condensate (BEC) of optical magnons. We derive the effective BEC free energy and consider the phonon spectrum when the spin superfluid BEC is formed in the anisotropic polar phase of superfluid 3He, experimentally observed in uniaxial aerogel 3He-samples. The coherent precession of magnetization experiences an instability at a critical value of the tilting angle of external magnetic field with respect to the anisotropy axis. From the action of quadratic deviations around equilibrium, this instability is interpreted as a Minkowski-to-Euclidean signature change of the effective phonon metric. We also note the similarity between the magnon BEC in the unstable region and an effective vacuum scalar “ghost” condensate.

KW - magnon BEC

KW - effective metric

KW - Polar 3He

U2 - 10.1134/S0021364017160032

DO - 10.1134/S0021364017160032

M3 - Article

VL - 106

SP - 234

EP - 241

JO - JETP LETTERS / PISMA V ZHURNAL EKSPERIMENTALNOI I TEORETICHESKOI FIZIKI

JF - JETP LETTERS / PISMA V ZHURNAL EKSPERIMENTALNOI I TEORETICHESKOI FIZIKI

SN - 0021-3640

IS - 4

ER -

ID: 16210634