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Magnetic field amplification and decay in cosmic string wakes.

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Title: Magnetic field amplification and decay in cosmic string wakes.
Authors: Bisht, Deepanshu1 (AUTHOR), Kumar, Dilip2 (AUTHOR), Nayak, Soumen2 (AUTHOR), Sanyal, Soma2 (AUTHOR) somasanyal@uohyd.ac.in
Source: International Journal of Modern Physics D: Gravitation, Astrophysics & Cosmology. Feb2026, Vol. 35 Issue 3, p1-22. 22p.
Subjects: Cosmic strings, Magnetic reconnection, Plasma physics, Magnetohydrodynamics, Magnetic flux density, Plasma magnetism, Larmor radius
Abstract: In this paper, we do a detailed study on the evolution of a magnetic field in a magnetized plasma within the spacetime of a moving cosmic string using analytical and numerical methods. The conical spacetime around the cosmic string causes the frozen-in magnetic field to deform due to the fluid flow. We find that the overdensity in the wake region amplifies the magnetic field. This amplification depends on the direction and the lengthscale of the magnetic perturbations. Alfven's theorem of flux conservation explains this result. However, our study also shows that the magnetic field can decay depending on the perturbation lengthscale, due to the breakdown of Alfven's theorem at a certain lengthscale. We have identified this lengthscale as the gyroradius of the charged particles in the plasma. Our findings are significant for understanding magnetic reconnection in cosmic string wakes. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Modern Physics D: Gravitation, Astrophysics & Cosmology is the property of World Scientific Publishing Company and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 191501825
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Magnetic field amplification and decay in cosmic string wakes.
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  Data: <searchLink fieldCode="AR" term="%22Bisht%2C+Deepanshu%22">Bisht, Deepanshu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kumar%2C+Dilip%22">Kumar, Dilip</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nayak%2C+Soumen%22">Nayak, Soumen</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sanyal%2C+Soma%22">Sanyal, Soma</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> somasanyal@uohyd.ac.in</i>
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Modern+Physics+D%3A+Gravitation%2C+Astrophysics+%26+Cosmology%22">International Journal of Modern Physics D: Gravitation, Astrophysics & Cosmology</searchLink>. Feb2026, Vol. 35 Issue 3, p1-22. 22p.
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  Data: <searchLink fieldCode="DE" term="%22Cosmic+strings%22">Cosmic strings</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+reconnection%22">Magnetic reconnection</searchLink><br /><searchLink fieldCode="DE" term="%22Plasma+physics%22">Plasma physics</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetohydrodynamics%22">Magnetohydrodynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+flux+density%22">Magnetic flux density</searchLink><br /><searchLink fieldCode="DE" term="%22Plasma+magnetism%22">Plasma magnetism</searchLink><br /><searchLink fieldCode="DE" term="%22Larmor+radius%22">Larmor radius</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: In this paper, we do a detailed study on the evolution of a magnetic field in a magnetized plasma within the spacetime of a moving cosmic string using analytical and numerical methods. The conical spacetime around the cosmic string causes the frozen-in magnetic field to deform due to the fluid flow. We find that the overdensity in the wake region amplifies the magnetic field. This amplification depends on the direction and the lengthscale of the magnetic perturbations. Alfven's theorem of flux conservation explains this result. However, our study also shows that the magnetic field can decay depending on the perturbation lengthscale, due to the breakdown of Alfven's theorem at a certain lengthscale. We have identified this lengthscale as the gyroradius of the charged particles in the plasma. Our findings are significant for understanding magnetic reconnection in cosmic string wakes. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Modern Physics D: Gravitation, Astrophysics & Cosmology is the property of World Scientific Publishing Company and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1142/S021827182550097X
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 22
        StartPage: 1
    Subjects:
      – SubjectFull: Cosmic strings
        Type: general
      – SubjectFull: Magnetic reconnection
        Type: general
      – SubjectFull: Plasma physics
        Type: general
      – SubjectFull: Magnetohydrodynamics
        Type: general
      – SubjectFull: Magnetic flux density
        Type: general
      – SubjectFull: Plasma magnetism
        Type: general
      – SubjectFull: Larmor radius
        Type: general
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      – TitleFull: Magnetic field amplification and decay in cosmic string wakes.
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            NameFull: Bisht, Deepanshu
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            NameFull: Kumar, Dilip
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            NameFull: Nayak, Soumen
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            NameFull: Sanyal, Soma
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            – D: 01
              M: 02
              Text: Feb2026
              Type: published
              Y: 2026
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              Value: 35
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          Titles:
            – TitleFull: International Journal of Modern Physics D: Gravitation, Astrophysics & Cosmology
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