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Confronting the Neutron Star Population with Inverse Cascades
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0003-2700-1030
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0002-7304-021X
Number of Authors: 32023 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 952, no 1, article id L21Article in journal (Refereed) Published
Abstract [en]

The origin and evolution of magnetic fields of neutron stars from birth have long been a source of debate. Here, motivated by recent simulations of the Hall cascade with magnetic helicity, we invoke a model where the large-scale magnetic field of neutron stars grows as a product of small-scale turbulence through an inverse cascade. We apply this model to a simulated population of neutron stars at birth and show how this model can account for the evolution of such objects across the  diagram, explaining both pulsar and magnetar observations. Under the assumption that small-scale turbulence is responsible for large-scale magnetic fields, we place a lower limit on the spherical harmonic degree of the energy-carrying magnetic eddies of ≈40. Our results favor the presence of a highly resistive pasta layer at the base of the neutron star crust. We further discuss the implications of this paradigm on direct observables, such as the nominal age and braking index of pulsars.

Place, publisher, year, edition, pages
2023. Vol. 952, no 1, article id L21
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-221063DOI: 10.3847/2041-8213/ace363ISI: 001036249100001Scopus ID: 2-s2.0-85166239231OAI: oai:DiVA.org:su-221063DiVA, id: diva2:1800163
Available from: 2023-09-26 Created: 2023-09-26 Last updated: 2023-09-26Bibliographically approved

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Sarin, NikhilBrandenburg, Axel

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Nordic Institute for Theoretical Physics (Nordita)Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)Department of Astronomy
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Astrophysical Journal Letters
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