Influence of a magnetic field on beta-processes in supernova matter

Dobrynina, Alexandra; Ognev, I. S.

doi:10.1103/physrevd.101.083003

Cited by 4 publications

(4 citation statements)

References 39 publications

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“…Therefore we conclude that the modified source terms do not play important roles in the dynamical time scale and contribute neither the explosion dynamics nor the natal (t pb 1 s) PNS kick. This basically agrees with previous studies Kotake et al (2005); Dobrynina & Ognev (2020). However, once those trapped neutrinos diffuse out the PNS core on a time scale of O(1) s, namely in the Kelvin-Helmholtz cooling phase, they can potentially produce a ∼ 0.1 − 1 % asymmetry in the PNS structure.…”

Section: Summary and Discussionsupporting

confidence: 92%

“…The cumulative impact of asymmetric deleptonization rate asymptotically reaches ∼ 0.1 − 1 %. Our result also indicates the importance of the modified inelastic scattering process, at least in the explosion phase, that has been often omitted in previous literature (Kotake et al 2005;Suwa & Enoto 2014;Dobrynina & Ognev 2020). The energy deposition rate from the modified scattering term showed roughly a one order of magnitude larger value than that of absorption process.…”

Section: Summary and Discussionsupporting

confidence: 72%

“…It is also noteworthy that Q b =0 sc has a comparable or even a slightly larger value than Q b =0 nae . This fact indicates the importance of the modified neutrino-nucleon scattering term due to the magnetic field that is often omitted in the previous studies on the parity violation effects in CCSNe (Kotake et al 2005;Suwa & Enoto 2014;Dobrynina & Ognev 2020).…”

Section: North-south Asymmetry Of Neutrino Matter Interactionmentioning

confidence: 89%

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Impact of magnetic field on neutrino-matter interactions in core-collapse supernova

Kuroda

2020

Preprint

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We explore the impact of magnetic field on neutrino-matter interactions in core-collapse supernova. We first derive the modified source terms for neutrino-nucleon scattering and neutrino absorption and emission processes in the moment formalism. Then we perform full relativistic three-dimensional, magnetorotational core-collapse supernova simulations of a 20 M ⊙ star with spectral neutrino transport. Our simulations treat self-consistently the parity violation effects of magnetic field on the lepton number, energy, and momentum exchanges. The result shows a clear global asymmetry with respect to the equatorial plane in each exchange rate. The asymmetric property arises from two factors: the angle between the neutrino flux and magnetic field and the term, which is parallel to the magnetic field and is also proportional to the deviation of distribution function of neutrinos from thermal equilibrium. The typical correction value amounts to ∼ 1 % relative to the total neutrino-matter interaction rate for the magnetic field strength of ∼ 10 15−16 G. Although these asymmetric properties do not immediately affect the explosion dynamics, our results imply that they would be significant once the neutrinos diffuse out the proto-neutron star core carrying those asymmetries away. We also show that, during our simulation time of ∼ 370 ms after bounce, our results indicate that the correction value due to the modified inelastic scattering process dominates over that of the modified neutrino absorption and emission process.

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Section: Summary and Discussionsupporting

confidence: 92%

Section: Summary and Discussionsupporting

confidence: 72%

Section: North-south Asymmetry Of Neutrino Matter Interactionmentioning

confidence: 89%

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Impact of magnetic field on neutrino-matter interactions in core-collapse supernova

Kuroda

2020

Preprint

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“…Therefore, we have obtained the reaction rates of beta-processes in the presence of a magnetic field [7]:…”

Section: Resultsmentioning

confidence: 99%

Magnetic-field influence on beta-processes in core-collapse supernova

Dobrynina¹,

Ognev²

2022

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2021)

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Neutrinos play a significant and sometimes even dominant role in all phases of the supernova explosion. The most important neutrino processes in a core-collapse supernova are beta-processes, which are responsible for the energy exchange between neutrinos and the matter and change a chemical composition of a medium. We investigate an influence of a magnetic field on betaprocesses under conditions of a supernova matter. For any magnetic field strength discussed in applications to astrophysical objects we obtain simple analytical expressions for reaction rates of beta-processes. In our analysis we use results of one-dimensional simulations of a supernova explosion performed with the PROMETHEUS-VERTEX code. We found that, the magnetic field with the strength 𝐵 ∼ 10 15 G suppresses the neutron production on several percents in comparison with the unmagnetized case. The obtained analytical expressions can be also applied for postmerger accretion discs.

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