Searching for relativistic axions in the sky

Kar, Arpan; Kumar, Tanmoy; Roy, Sourov; Zupan, Jure

doi:10.1088/1475-7516/2023/08/056

Cited by 6 publications

(4 citation statements)

References 76 publications

(116 reference statements)

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“…This component has a shorter correlation length than the large-scale component we used in this study and its strength is 5.5µG [35]. It has been shown that it can enhance the conversion of diffuse axions to photons by many orders of magnitude and it should be taken into account in future work [31,33]. Also, we have not considered the distribution of axion stars in the galactic plane, which, to our knowledge, is not known.…”

Section: Discussionmentioning

confidence: 93%

“…The universe is abundant with magnetic fields and many astrophysical settings have been considered in the literature as possible "laboratories" where the axion to photon conversion could be detected. These range from pulsars [17][18][19][20][21][22] and magnetars [23][24][25], to white dwarfs [26][27][28], to AGN's [29,30], to the galactic magnetic field [31][32][33][34].…”

Section: Jhep12(2023)164mentioning

confidence: 99%

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Dilute axion stars converting to photons in the Milky Way’s magnetic field

Kyriazis

2023

J. High Energ. Phys.

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In this paper we examine the possibility of dilute axion stars converting to photons in the weak, large-scale magnetic field of the Milky Way and show that they can resonate with the surrounding plasma and produce a sizable signal. We consider two possibilities for the plasma: free electrons and HII regions. In the former case, we argue that the frequency of the photons will be too small to be observed even by space-based radio telescopes. In the latter case, their frequency is larger, safely above the solar wind cut-off. We provide an estimate of the flux as a function of the decay constant and show that for fa< 2 × 1011 GeV, the signal will be above the radio emission of the solar system’s planets and it could potentially be detected by the NCLE instrument which is on board the Chang’e-4 spacecraft. Finally, we calculate the time scale of decay of the axion star and demonstrate that back-reaction can be neglected for all physically interesting values of the decay constant, while the minimum time scale of decay is in the order of a few hours.

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Section: Discussionmentioning

confidence: 93%

Section: Jhep12(2023)164mentioning

confidence: 99%

Dilute axion stars converting to photons in the Milky Way’s magnetic field

Kyriazis

2023

J. High Energ. Phys.

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“…Refs. [389][390][391][392][393], and even attempts at direct detection [394], however the readily-detectable models at the moment typically require that the heavier particle also makes up the dark matter and its subsequent decays into axions over the age of the Universe cause a background of them to build up [393,395,396]. Many other examples of diffuse axion backgrounds were catalogued recently in Ref.…”

Section: Pos(cosmicwispers)040 Pos(cosmicwispers)040mentioning

confidence: 99%

Cosmology of axion dark matter

O'Hare

2024

Proceedings of 1st General Meeting and 1st Training School of the COST Action COSMIC WSIPers — PoS(COSMICWISPers)

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I present an introduction and topical review on axions as a dark matter candidate. Emphasis is placed on issues surrounding the cosmology of axion dark matter that are relevant for presentday searches, including: early-Universe production mechanisms, predictions of the axion mass, bounds on axion properties derived from cosmological data, as well as the direct and indirect detection of relic axion populations.

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“…So analysis of these polarized emissions would give valuable insights into axion properties. It is also worth studying the photon axion conversion in the presence of cosmic axion background [86,87]. The dark matter aspects can also be explored if this axion background is present near the photon sphere.…”

Section: Jcap11(2023)099mentioning

confidence: 99%

Exploring axions through the photon ring of a spherically symmetric black hole

Roy,

Sarkar,

et al. 2023

J. Cosmol. Astropart. Phys.

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In this study, we examine the phenomenon of photon axion conversion occurring in the spacetime surrounding a black hole. Specifically, we focus on the potential existence of a magnetic field around the supermassive black hole M87*, which could facilitate the conversion of photons into axions in close proximity to the photon sphere. While photons traverse through the curved spacetime, they spend time near the photon sphere, where conversion of these photons into axions takes place. Consequently, this process leads to a decrease in the intensity of the black hole's photon ring. To explore the possibilities of detecting these hypothetical axion particles, we propose observing the photon sphere using higher resolution telescopes. By doing so, we can gain valuable insights into the conversion mechanism as well as the nature of the spherically symmetric black hole geometry. Moreover, we also investigate how the photon ring luminosities are affected if the black hole possesses a charge parameter. For instance apart from U(1) electric charge, the presence of extra dimension may induce a tidal charge with a characteristic signature. It is important to note that the success of the conversion mechanism relies on the axion-photon coupling and mass. As a result, the modified luminosity of the black hole's photon ring offers a valuable means of constraining the axion's mass and coupling parameter within a certain range. Thus our findings contribute to a better understanding of photon axion conversion in the environment of a black hole spacetime and helps us explore the possible existence of extra spatial dimension.

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Searching for relativistic axions in the sky

Cited by 6 publications

References 76 publications

Dilute axion stars converting to photons in the Milky Way’s magnetic field

Dilute axion stars converting to photons in the Milky Way’s magnetic field

Cosmology of axion dark matter

Exploring axions through the photon ring of a spherically symmetric black hole

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