Multi-Wavelength Polarimetry of Isolated Neutron Stars

Mignani, Roberto

doi:10.3390/galaxies6010036

Cited by 9 publications

(3 citation statements)

References 80 publications

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“….13) which could be sizable for an NS with a smaller rotation frequency. We also note that the two electric fields have different polarizations, which could be used as a probe [34,35] for the existence of the axion hair.…”

Section: Jhep05(2024)312mentioning

confidence: 94%

Electrobaryonic axion: hair of neutron stars

Bai,

de Lima

2024

J. High Energ. Phys.

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Axion-like particles are predicted in many physics scenarios beyond the Standard Model (SM). Their interactions with SM particles may arise from the triangle anomaly of the associated global symmetry, along with other SM global and gauge symmetries, including anomalies with the global baryon number and electromagnetic gauge symmetries. We initiate the phenomenological study of the corresponding “electrobaryonic axion”—a particle that couples with both the baryon chemical potential and the electromagnetic field. Neutron stars, particularly magnetars, possessing high baryon density and strong magnetic fields, can naturally develop a thin axion hair around their surface. In this study, we calculate this phenomenon, considering the effects of neutron star rotation and general relativity. For axion particles lighter than the neutron star rotation frequency, the anomalous interaction can also induce the emission of axion particles from the neutron star. In the light axion regime, this emission can significantly contribute to the neutron star cooling rate.

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Section: Jhep05(2024)312mentioning

confidence: 94%

Electrobaryonic axion: hair of neutron stars

Bai,

de Lima

2024

J. High Energ. Phys.

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“…Up to now, polarisation was measured for several rotation-powered radio pulsars [217]. In this case, polarisation mainly reflects intrinsic properties of magnetospheric emission.…”

Section: Polarisationmentioning

confidence: 99%

Evolution of Neutron Star Magnetic Fields

2021

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Neutron stars are natural physical laboratories allowing us to study a plethora of phenomena in extreme conditions. In particular, these compact objects can have very strong magnetic fields with non-trivial origin and evolution. In many respects, its magnetic field determines the appearance of a neutron star. Thus, understanding the field properties is important for the interpretation of observational data. Complementing this, observations of diverse kinds of neutron stars enable us to probe parameters of electro-dynamical processes at scales unavailable in terrestrial laboratories. In this review, we first briefly describe theoretical models of the formation and evolution of the magnetic field of neutron stars, paying special attention to field decay processes. Then, we present important observational results related to the field properties of different types of compact objects: magnetars, cooling neutron stars, radio pulsars, and sources in binary systems. After that, we discuss which observations can shed light on the obscure characteristics of neutron star magnetic fields and their behaviour. We end the review with a subjective list of open problems.

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“…Up to now polarisation is measured for several rotation-powered radio pulsars [210]. In this case polarisation mainly reflects intrinsic properties of magnetospheric emission.…”

Section: Polarisationmentioning

confidence: 99%