Detecting Solar Axions Using Earth’s Magnetic Field

Davoudiasl, Hooman

doi:10.1103/physrevlett.97.141302

Cited by 37 publications

(34 citation statements)

References 19 publications

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“…Hudson et al (2012) discuss progress and limitations in this approach. Davoudiasl & Huber (2006) suggest observing axion mode conversion in the magnetic field of the earth, in such a manner that the earth itself blocks out the thermal continuum from the sun. While this estimate uses the observationally allowed axion parameter space rather than a specific model to arrive at a count rate, it does have the advantage that a null result would be more readily interpreted.…”

Section: In Real Numbers mentioning

confidence: 99%

On the detectability of⁵⁷Fe axion-photon mode conversion in the Sun

Laming¹

2013

A&A

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Aims. The purpose of this paper is to assess the feasibility of axion detection by X-ray spectroscopy of the sun. Methods. We review the theory of axion-photon mode conversion with special attention to axions emitted in the 14.4 keV M1 decay of 57 Fe at the solar center. These then mode convert to photons in the outer layers of the solar envelope, and may in principle be detected subsequently as X-rays. Results. For axion masses above about 10 −4 eV, resonant mode conversion at a layer where the axion mass matches the local electron plasma frequency is necessary. For axion masses above about 10 −2 eV, this mode conversion occurs too deep in the solar atmosphere for the resulting photon to escape the solar surface and be detected before Compton scattering obscures the line. At the (detectable) axion masses below this, the flux of mode converted photons predicted by axion models appears to be too low for detection to be feasible with current instrumentation. Nonresonant mode conversion for axion masses below 10 −4 eV is also plausible, but with still lower predicted fluxes, since the axion coupling constant is related to its mass. Conclusions. Prospects for meaningful constraints on massive axion parameters from X-ray observations of this transition from the Sun do not appear to be promising. However parameters for massless counterparts (e.g. the "arion") may still result from such observations. It may mode convert in the outer layers of the solar atmosphere, but is not restricted by this to have a small coupling constant.

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Section: In Real Numbers mentioning

confidence: 99%

On the detectability of⁵⁷Fe axion-photon mode conversion in the Sun

Laming¹

2013

A&A

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“…However, over distances L ≪ R ⊕ above the Earth's surface, it can be assumed that B ⊕ = const. As we are interested in low Earth orbits (L < 1000 km), this is a valid assumption (28). The influence of the atmosphere of the Earth is negligible, since for L > 150 km solar axions essentially travel in vacuum.…”

Section: Geomagnetic Axion Conversionmentioning

confidence: 99%

“…It has recently been shown by (28) that Geomagnetic Conversion of Solar Axions to X-rays (GECOSAX) can yield a photon flux which is measurable by a satellite based X-ray observatory on the dark side of the Earth. A key ingredient of this idea is to use the Earth as an X-ray shield and look for axions The observational setup to detect geomagnetic converted axions (GECOSAX).…”

Section: Geomagnetic Axion Conversionmentioning

confidence: 99%

“…Here m A is the axion mass, M = 1/g aγγ the inverse coupling constant to two photons, ω the photon energy, L and N the effective path lengths and the number of paths the light travels in the transverse magnetic field. The polarization state of the light beam leaving the magnetic field, characterized by (28) and (29), would manifest itself as a sizeable deviation from the pure QED prediction (44; 45) for which no measurable linear dichroism is expected.…”

Section: Probing the Magneto-optical Properties Of The Vacuummentioning

confidence: 99%

“…Based on the published technical specifications (27) of the Rossi X-ray timing explorer (RXTE), (28) have estimated that the flux given by (21) can be detected on the dark side of the Earth. However, recently the Suzaku X-ray satellite team has measured the darkEarth X-ray background in the range of 2 to 7 keV for calibration purposes (29).…”

Section: Geomagnetic Axion Conversionmentioning

confidence: 99%

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Axion Searches in the Past, at Present, and in the Near Future

Battesti

Beltrán

Davoudias

et al.

Lecture Notes in Physics

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Summary. Theoretical axion models state that axions are very weakly interacting particles. In order to experimentally detect them, the use of colorful and inspired techniques becomes mandatory. There is a wide variety of experimental approaches that were developed during the last 30 years, most of them make use of the Primakoff effect, by which axions convert into photons in the presence of an electromagnetic field. We review the experimental techniques used to search for axions and will give an outlook on experiments planned for the near future.

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Jupiter missions as probes of dark matter

Fan

2022

J. High Energ. Phys.

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Jupiter, the fascinating largest planet in the solar system, has been visited by nine spacecraft, which have collected a significant amount of data about Jovian properties. In this paper, we show that one type of the in situ measurements on the relativistic electron fluxes could be used to probe dark matter (DM) and dark mediator between the dark sector and our visible world. Jupiter, with its immense weight and cool core, could be an ideal capturer for DM with masses around the GeV scale. The captured DM particles could annihilate into long-lived dark mediators such as dark photons, which subsequently decay into electrons and positrons outside Jupiter. The charged particles, trapped by the Jovian magnetic field, have been measured in Jupiter missions such as the Galileo probe and the Juno orbiter. We use the data available to set upper bounds on the cross section of DM scattering off nucleons, σχn, for dark mediators with lifetime of order $$ \mathcal{O} $$ O (0.1–1) s. The results show that data from Jupiter missions already probe regions in the parameter space un- or under-explored by existing DM searches, e.g., constrain σχn of order (10−41–10−39) cm2 for 1 GeV DM dominantly annihilating into e+e− through dark mediators. This study serves as an example and an initial step to explore the full physics potential of the large planetary datasets from Jupiter missions. We also outline several other potential directions related to secondary products of electrons, positron signals and solar axions.

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Detecting Solar Axions Using Earth’s Magnetic Field

Cited by 37 publications

References 19 publications

On the detectability of⁵⁷Fe axion-photon mode conversion in the Sun

On the detectability of⁵⁷Fe axion-photon mode conversion in the Sun

Axion Searches in the Past, at Present, and in the Near Future

Jupiter missions as probes of dark matter

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Detecting Solar Axions Using Earth’s Magnetic Field

Cited by 37 publications

References 19 publications

On the detectability of57Fe axion-photon mode conversion in the Sun

On the detectability of57Fe axion-photon mode conversion in the Sun

Axion Searches in the Past, at Present, and in the Near Future

Jupiter missions as probes of dark matter

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On the detectability of⁵⁷Fe axion-photon mode conversion in the Sun

On the detectability of⁵⁷Fe axion-photon mode conversion in the Sun