Axion production in pulsar magnetosphere gaps

Prabhu, Anirudh

doi:10.1103/physrevd.104.055038

Cited by 24 publications

(10 citation statements)

References 83 publications

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“…Axions interact with electromagnetism through the operator described by equation (1). This interaction implies that axions can be generated electromagnetically in regions where E•B = 0, such as in the vacuum gaps above pulsar polar caps (Prabhu 2021;Noordhuis et al 2022). Equation (1) also leads to a non-linear modification of Maxwell's equations that allows for interconversion between axions and photons 2 .…”

Section: Axion-photon Mixing In Plasmamentioning

confidence: 99%

Axion-mediated Transport of Fast Radio Bursts Originating in Inner Magnetospheres of Magnetars

Prabhu¹

2023

Preprint

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Among magnetar models of Fast Radio Bursts (FRBs), there is ongoing debate about whether the site of coherent radio emission lies within or beyond the light cylinder. We propose a mechanism by which FRBs produced near the magnetar surface are transported out of the magnetosphere by axions, which couple to photons. If the emission site hosts strong accelerating electric fields, a considerable fraction of the FRB energy budget is converted to an axion burst. Once produced, the axion burst free-streams out of the magnetosphere due to the rapidly-decreasing magnetic field. The burst may escape through either the open or closed magnetosphere, while retaining the temporal signature of the original FRB. In the wind region, axions resonantly excite ordinary (O) modes that escape as the plasma density decreases. The radio efficiency of this mechanism satisfies energetics constraints from FRB 121102 for axion-photon coupling strengths that have not been excluded by other astrophysical probes.

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Section: Axion-photon Mixing In Plasmamentioning

confidence: 99%

Axion-mediated Transport of Fast Radio Bursts Originating in Inner Magnetospheres of Magnetars

Prabhu¹

2023

Preprint

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“…Axions interact with electromagnetism through the operator described by Equation (1). This interaction implies that axions can be generated electromagnetically in regions where E • B ≠ 0, such as in the vacuum gaps above pulsar polar caps (Prabhu 2021;Noordhuis et al 2022). Equation (1) also leads to a nonlinear modification of Maxwell's equations that allows for interconversion between axions and photons.…”

Section: Axion−photon Mixing In Plasmamentioning

confidence: 99%

Axion-mediated Transport of Fast Radio Bursts Originating in Inner Magnetospheres of Magnetars

Prabhu

2023

ApJL

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Among magnetar models of fast radio bursts (FRBs), there is ongoing debate about whether the site of coherent radio emission lies within or beyond the light cylinder. We propose a mechanism by which FRBs produced near the magnetar surface are transported out of the magnetosphere by axions, which are hypothetical particles that couple to photons. If the emission site hosts strong accelerating electric fields, a considerable fraction of the FRB energy budget is converted to an axion burst. Once produced, the axion burst free streams out of the magnetosphere due to the rapidly decreasing magnetic field. The burst may escape through either the open or closed magnetosphere while retaining the temporal signature of the original FRB. In the wind region, axions resonantly excite ordinary (O) modes that escape as the plasma density decreases. The radio efficiency of this mechanism satisfies energetics constraints from FRB 121102 for axion−photon coupling strengths that have not been excluded by other astrophysical probes.

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“…This coupling could be detected through the decay of axions to photons (which can be stimulated [225][226][227][228][229][230][231][232] or resonantly enhanced [233][234][235][236][237][238][239][240][241]), axion-photon mixing in an external magnetic field [242] (which can notably also imprint an asymmetry on the polarization spectrum, see [e.g. 243]), birefringence [244][245][246][247][248][249][250][251], or the production of axions from non-orthogonal electric and magnetic fields [252]. Axions could also couple to matter and thereby be produced abundantly in stars via bremsstrahlung emission [253].…”

Section: Axion Indirect Detectionmentioning

confidence: 99%

Astrophysical and Cosmological Probes of Dark Matter

Boddy¹,

Lisanti²,

McDermott³

et al. 2022

Preprint

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While astrophysical and cosmological probes provide a remarkably precise and consistent picture of the quantity and general properties of dark matter, its fundamental nature remains one of the most significant open questions in physics. Obtaining a more comprehensive understanding of dark matter within the next decade will require overcoming a number of theoretical challenges: the groundwork for these strides is being laid now, yet much remains to be done. Chief among the upcoming challenges is establishing the theoretical foundation needed to harness the full potential of new observables in the astrophysical and cosmological domains, spanning the early Universe to the inner portions of galaxies and the stars therein. Identifying the nature of dark matter will also entail repurposing and implementing a wide range of theoretical techniques from outside the typical toolkit of astrophysics, ranging from effective field theory to the dramatically evolving world of machine learning and artificial-intelligence-based statistical inference. Through this work, the theory frontier will be at the heart of dark matter discoveries in the upcoming decade.

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Axion production in pulsar magnetosphere gaps

Cited by 24 publications

References 83 publications

Axion-mediated Transport of Fast Radio Bursts Originating in Inner Magnetospheres of Magnetars

Axion-mediated Transport of Fast Radio Bursts Originating in Inner Magnetospheres of Magnetars

Axion-mediated Transport of Fast Radio Bursts Originating in Inner Magnetospheres of Magnetars

Astrophysical and Cosmological Probes of Dark Matter

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