Strategies to Detect Dark-Matter Decays with Line-Intensity Mapping
arXiv:2012.00771 · doi:10.1103/PhysRevD.103.063523
Abstract
The nature of dark matter is a longstanding mystery in cosmology, which can be studied with laboratory or collider experiments, as well as astrophysical and cosmological observations. In this work, we propose realistic and efficient strategies to detect radiative products from dark-matter decays with line-intensity mapping (LIM) experiments. This radiation will behave as a line interloper for the atomic and molecular spectral lines targeted by LIM surveys. The most distinctive signatures of the contribution from dark-matter radiative decays are an extra anisotropy on the LIM power spectrum due to projection effects, as well as a narrowing and a shift towards higher intensities of the voxel intensity distribution. We forecast the minimum rate of decays into two photons that LIM surveys will be sensitive to as function of the dark-matter mass in the range eV, and discuss how to reinterpret such results for dark matter that decays into a photon and another particle. We find that both the power spectrum and the voxel intensity distribution are expected to be very sensitive to the dark-matter contribution, with the voxel intensity distribution being more promising for most experiments considered. Interpreting our results in terms of the axion, we show that LIM surveys will be extremely competitive to detect its decay products, improving several orders of magnitudes (depending on the mass) the sensitivity of laboratory and astrophysical searches, especially in the mass range eV.
14+3(app.)+4(refs.) pages, 7 figures and 3 tables. Colorbar of fig 1 corrected
References in corpus (25)
- Revisiting the bound on axion-photon coupling from Globular Clusters
- Primordial Nucleosynthesis: from precision cosmology to fundamental physics
- Late-time cosmology with 21cm intensity mapping experiments
- General Constraints on Dark Matter Decay from the Cosmic Microwave Background
- Physics potential of the International Axion Observatory (IAXO)
- Canadian Hydrogen Intensity Mapping Experiment (CHIME) Pathfinder
- Big Bang Nucleosynthesis as a Probe of New Physics
- Cosmology with the SPHEREX All-Sky Spectral Survey
- A Method for 21cm Power Spectrum Estimation in the Presence of Foregrounds
- HIRAX: A Probe of Dark Energy and Radio Transients
- Line-Intensity Mapping: 2017 Status Report
- The Effects of Dark Matter Decay and Annihilation on the High-Redshift 21 cm Background
- A Telescope Search for Decaying Relic Axions
- The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX): Description and Early Pilot Survey Results
- The synergy between CMB spectral distortions and anisotropies
- Unveiling the nature of dark matter with high redshift 21 cm line experiments
- Non-universal BBN bounds on electromagnetically decaying particles
- The nature of dark matter from the global high redshift HI 21 cm signal
- Impact of Foregrounds on HI Intensity Mapping Cross-Correlations with Optical Surveys
- Intensity mapping of H-alpha, H-beta, [OII] and [OIII] lines at z<5
- Insights from probability distribution functions of intensity maps
- Astrophysics and Cosmology with Line-Intensity Mapping
- Particle decay in the early universe: predictions for 21 cm
- The Atacama Large Aperture Submillimeter Telescope (AtLAST)
- Antisymmetric cross-correlation of line-intensity maps as a probe of reionization