Transport Properties of Superfluid Phonons in Neutron Stars

Manuel, Cristina; Tolós, Laura

doi:10.3390/universe7030059

Cited by 6 publications

(6 citation statements)

References 45 publications

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“…At the simplest variational level, thermal conductivity and shear viscosity are given by eqs. ( 157) and (158), where the effective generalized complex mean free paths are found from the system of linear algebraic equations (155 or (155). The core of this system is the transport matrix elements Λ k ab and Λ k ab (k = κ, η, and a, b indicate particle species) which are expressed by the angular averages of the scattering probabilities with certain weighting factors depending on the transport problem in question.…”

Section: Discussionmentioning

confidence: 99%

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Transport coefficients of magnetized neutron star cores

Shternin,

Ofengeim

2022

Preprint

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We review the calculations of the kinetic coefficients (thermal conductivity, shear viscosity, momentum transfer rates) of the neutron star core matter within the framework of the Landau Fermi-liquid theory. We restrict ourselves to the case of normal (i.e. nonsuperfluid) matter. As an example we consider simplest npeµ composition of neutron star core matter. Utilizing the CompOSE database of dense matter equations of state and several microscopic interactions we analyze the uncertainties in calculations of the kinetic coefficients that result from the insufficient knowledge of the properties of the dense nuclear matter and suggest possible approximate treatment. In our study we also take into account non-quantizing magnetic field. The presence of magnetic field makes transport anisotropic leading to the tensor structure of kinetic coefficients. We find that the moderate (B 10 12 G) magnetic field do not affect considerably thermal conductivity of neutron star core matter, since the latter is mainly governed by the electrically neutral neutrons. In contrast, shear viscosity is affected even by the moderate B ∼ 10 8 − 10 10 G. Based on the in-vacuum nucleon interactions we provide practical expressions for calculation of transport coefficients for any equation of state of dense matter.

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Section: Discussionmentioning

confidence: 99%

“…At low temperatures, another excitations, namely the superfluid phonons, can contribute to the transport properties of NS core matter. This contribution is reviewed in, e.g., [158].…”

Section: Discussionmentioning

confidence: 99%

Transport coefficients of magnetized neutron star cores

Shternin,

Ofengeim

2022

Preprint

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“…In addition, if charged species are paired, the electromagnetic polarization of this superconducting matter is modified which affects the scattering rate of all charged quasiparticles (even non-superconducting ones, such as leptons) [39,47]. At low temperatures, the gapless Goldstone modes, e.g., superfluid phonons, can contribute to the transport properties of matter, see, e.g., [85], for a review.…”

Section: Discussionmentioning

confidence: 99%

Transport Coefficients of Hyperonic Neutron Star Cores

Shternin

Vidaña

2021

Universe

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We consider transport properties of the hypernuclear matter in neutron star cores. In particular, we calculate the thermal conductivity, the shear viscosity, and the momentum transfer rates for npΣ−Λeμ composition of dense matter in β–equilibrium for baryon number densities in the range 0.1–1 fm−3. The calculations are based on baryon interactions treated within the framework of the non-relativistic Brueckner-Hartree-Fock theory. Bare nucleon-nucleon (NN) interactions are described by the Argonne v18 phenomenological potential supplemented with the Urbana IX three-nucleon force. Nucleon-hyperon (NY) and hyperon-hyperon (YY) interactions are based on the NSC97e and NSC97a models of the Nijmegen group. We find that the baryon contribution to transport coefficients is dominated by the neutron one as in the case of neutron star cores containing only nucleons. In particular, we find that neutrons dominate the total thermal conductivity over the whole range of densities explored and that, due to the onset of Σ− which leads to the deleptonization of the neutron star core, they dominate also the shear viscosity in the high density region, in contrast with the pure nucleonic case where the lepton contribution is always the dominant one.

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“…superfluid phonons, can contribute to the transport properties of matter, see, e.g. [86], for a review.…”

Section: Discussionmentioning

confidence: 99%

Transport coefficients of hyperonic neutron star cores

Shternin,

Vidaña

2021

Preprint

View full text Add to dashboard Cite

We consider transport properties of the hypernuclear matter in neutron star cores. In particular, we calculate the thermal conductivity, the shear viscosity, and the momentum transfer rates for npΣ − Λeµ composition of dense matter in β-equilibrium for baryon number densities in the range 0.1 − 1 fm −3 . The calculations are based on baryon interactions treated within the framework of the non-relativistic Brueckner-Hartree-Fock theory. Bare nucleon-nucleon (NN) interactions are described by the Argonne v18 phenomenological potential supplemented with the Urbana IX three-nucleon force. Nucleon-hyperon (NY) and hyperon-hyperon (YY) interactions are based on the NSC97e and NSC97a models of the Nijmegen group. We find that the baryon contribution to transport coefficients is dominated by the neutron one as in the case of neutron star cores containing only nucleons. In particular, we find that neutrons dominate the total thermal conductivity over the whole range of densities explored and that, due to the onset of Σ − which leads to the deleptonization of the neutron star core, they dominate also the shear viscosity in the high density region, in contrast with the pure nucleonic case where the lepton contribution is always the dominant one.

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Transport Properties of Superfluid Phonons in Neutron Stars

Cited by 6 publications

References 45 publications

Transport coefficients of magnetized neutron star cores

Transport coefficients of magnetized neutron star cores

Transport Coefficients of Hyperonic Neutron Star Cores

Transport coefficients of hyperonic neutron star cores

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