Probing axions via light circular polarization and event horizon telescope

Shakeri, Soroush; Hajkarim, Fazlollah

doi:10.1088/1475-7516/2023/04/017

Cited by 11 publications

(3 citation statements)

References 124 publications

(191 reference statements)

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“…These include spin-precession instruments [30], electromagnetic squeezing [31][32][33], Stern-Gerlach interferometers [34], and spin-based amplifiers [35,36]. It has been shown that the ALP-photon interaction is enhanced in the presence of a magnetic field [37][38][39][40]. This effect is further enhanced when employing either a space-periodic magnetic field [32] or a time-periodic one [33,41].…”

Section: Introductionmentioning

confidence: 99%

Induced circular polarization on photons due to interaction with axion-like particles in rotating magnetic field of neutron stars

Sharifian,

Zarei,

Matarrese

et al. 2024

J. Cosmol. Astropart. Phys.

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We investigate how the photon polarization is affected by the interaction with axion-like particles (ALPs) in the rotating magnetic field of a neutron star (NS). Using quantum Boltzmann equations the study demonstrates that the periodic magnetic field of millisecond NSs enhances the interaction of photons with ALPs and creates a circular polarization on them. A binary system including an NS and a companion star could serve as a probe. When the NS is in front of the companion star with respect to the earth observer, there is a circular polarization on the previously linearly polarized photons as a result of the interaction with ALPs there. After a half-binary period, the companion star passes in front of the NS, and the circular polarization of photons disappears and changes to linear. The excluded parameter space for a millisecond NS with 300 Hz rotating frequency, highlights the coupling constant of 1.7 × 10-11 GeV-1 ≤ gaγγ ≤ 1.6 × 10-3 GeV-1 for the ALP masses in the range of 7 × 10-12 eV ≤ ma ≤ 1.5 × 103 eV.

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Section: Introductionmentioning

confidence: 99%

Induced circular polarization on photons due to interaction with axion-like particles in rotating magnetic field of neutron stars

Sharifian,

Zarei,

Matarrese

et al. 2024

J. Cosmol. Astropart. Phys.

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“…Moreover, the conversion of photons into axions leads to a dimming of the photon ring around the black hole shadow [66]. The photon scattering from the background magnetic field with axions is also found to generate a significant circular polarization around the horizon of supermassive black hole [67] and in blazars [68]. The polarization-dependent bending that a ray of light experiences by traveling through an axion cloud is studied in the background of a Kerr black hole [69].…”

Section: Introductionmentioning

confidence: 99%

Kerr black hole shadows from axion-photon coupling

Chen,

Jing

2024

J. Cosmol. Astropart. Phys.

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We have investigated the motion for photons in the Kerr black hole spacetime under the axion-photon coupling. The birefringence phenomena arising from the axion-photon coupling can be negligible in the weak coupling approximation because the leading-order contributions to the equations of motion come from the square term of the coupling parameter. We find that the coupling parameter makes the size of shadows slightly increase for arbitrary spin parameter. For the rapid rotating black hole case with a larger coupling, we find that there exist a “pedicel”-like structure appeared in the left of the “D”-type like shadows. Comparing the shadow size of the Kerr black hole with the shadow size of the Sgr A* and M87* black holes, we make constraints on the parameter space for such a theoretical model of the axion-photon coupling.

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“…Among various DM candidates, bosonic DM models such as scalar fields, axions and sexaquarks are of great interest in various aspects of astrophysics and have been examined via their impacts on compact objects [19,66,67]. In this research, in order to model DM, we consider a self-repulsive complex scalar field with sub-GeV bosonic particles and a coupling constant in the order of unity.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Distribution and Impact of Bosonic Dark Matter in Neutron Stars

Rafiei Karkevandi,

Shahrbaf,

Shakeri

et al. 2024

Particles

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The presence of dark matter (DM) within neutron stars (NSs) can be introduced by different accumulation scenarios in which DM and baryonic matter (BM) may interact only through the gravitational force. In this work, we consider asymmetric self-interacting bosonic DM, which can reside as a dense core inside the NS or form an extended halo around it. It is seen that depending on the boson mass (mχ), self-coupling constant (λ) and DM fraction (Fχ), the maximum mass, radius and tidal deformability of NSs with DM admixture will be altered significantly. The impact of DM causes some modifications in the observable features induced solely by the BM component. Here, we focus on the widely used nuclear matter equation of state (EoS) called DD2 for describing NS matter. We show that by involving DM in NSs, the corresponding observational parameters will be changed to be consistent with the latest multi-messenger observations of NSs. It is seen that for mχ≳200 MeV and λ≲2π, DM-admixed NSs with 4%≲Fχ≲20% are consistent with the maximum mass and tidal deformability constraints.

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Probing axions via light circular polarization and event horizon telescope

Cited by 11 publications

References 124 publications

Induced circular polarization on photons due to interaction with axion-like particles in rotating magnetic field of neutron stars

Induced circular polarization on photons due to interaction with axion-like particles in rotating magnetic field of neutron stars

Kerr black hole shadows from axion-photon coupling

Exploring the Distribution and Impact of Bosonic Dark Matter in Neutron Stars

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