Indirect detection of eV dark matter via infrared spectroscopy

Taiki Bessho (PhotoCross Inc., 17-203 Iwakura-Minami, Sakyo-ku, Kyoto 606-003, Japan) ; Yuji Ikeda (Laboratory of Infrared High-resolution Spectroscopy, Koyama Astronomical Observatory, Kyoto Sangyo, Motoyama, Kamigamo, Kita-ku, Kyoto 603-8555, Japan; PhotoCross Inc., 17-203 Iwakura-Minami, Sakyo-ku, Kyoto 606-003, Japan) ; Wen Yin (Department of Physics, Tohoku University, Sendai, Miyagi 980-8578, Japan)

Infrared spectroscopy has been developed significantly. In particular, infrared photons can be measured with high spectral and angular resolution in state-of-the-art spectrographs. They are sensitive to monochromatic photons due to the decay and annihilation of particles beyond the standard model, such as dark matter (DM), while being insensitive to background photons that form a continuous spectrum. In this paper, we study the indirect detection of the DM decaying into infrared light using infrared spectrographs. In particular, we show that serious thermal and astrophysical noises can be overcome. As concrete examples, the Warm INfrared Echelle spectrograph to Realize Extreme Dispersion and sensitivity (WINERED) installed at the Magellan Clay 6.5 m telescope and Near-InfraRed Spectrograph (NIRSpec) at the James Webb Space Telescope (JWST) are discussed. We show that a few hours of measurements of a faint dwarf spheroidal galaxy with WINERED (NIRSpec-like spectrograph) in the Magellan telescope (JWST) can probe an axionlike particle DM in the mass range mϕ=1.82.7 eV (0.5–4 eV) with a photon coupling gϕγγ1011 GeV1. Complemental approaches, taking advantage of the high resolutions, such as the measurement of the Doppler shift of the signal photon lines and the possible search of the DM decay around the Milky Way Galaxy Center with infrared camera and spectrograph at 8.2 m Subaru telescope, are also presented.

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      "source": "APS", 
      "value": "Infrared spectroscopy has been developed significantly. In particular, infrared photons can be measured with high spectral and angular resolution in state-of-the-art spectrographs. They are sensitive to monochromatic photons due to the decay and annihilation of particles beyond the standard model, such as dark matter (DM), while being insensitive to background photons that form a continuous spectrum. In this paper, we study the indirect detection of the DM decaying into infrared light using infrared spectrographs. In particular, we show that serious thermal and astrophysical noises can be overcome. As concrete examples, the Warm INfrared Echelle spectrograph to Realize Extreme Dispersion and sensitivity (WINERED) installed at the Magellan Clay 6.5 m telescope and Near-InfraRed Spectrograph (NIRSpec) at the James Webb Space Telescope (JWST) are discussed. We show that a few hours of measurements of a faint dwarf spheroidal galaxy with WINERED (NIRSpec-like spectrograph) in the Magellan telescope (JWST) can probe an axionlike particle DM in the mass range <math><msub><mi>m</mi><mi>\u03d5</mi></msub><mo>=</mo><mn>1.8</mn><mi>\u2013</mi><mn>2.7</mn><mtext> </mtext><mtext> </mtext><mi>eV</mi></math> (0.5\u20134 eV) with a photon coupling <math><msub><mi>g</mi><mrow><mi>\u03d5</mi><mi>\u03b3</mi><mi>\u03b3</mi></mrow></msub><mo>\u2273</mo><msup><mn>10</mn><mrow><mo>\u2212</mo><mn>11</mn></mrow></msup><mtext> </mtext><mtext> </mtext><msup><mrow><mi>GeV</mi></mrow><mrow><mo>\u2212</mo><mn>1</mn></mrow></msup></math>. Complemental approaches, taking advantage of the high resolutions, such as the measurement of the Doppler shift of the signal photon lines and the possible search of the DM decay around the Milky Way Galaxy Center with infrared camera and spectrograph at 8.2 m Subaru telescope, are also presented."
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Published on:
22 November 2022
Publisher:
APS
Published in:
Physical Review D , Volume 106 (2022)
Issue 9
DOI:
https://doi.org/10.1103/PhysRevD.106.095025
arXiv:
2208.05975
Copyrights:
Published by the American Physical Society
Licence:
CC-BY-4.0

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