What's dark matter
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Understanding Dark Matter: A Comprehensive Overview
Introduction to Dark Matter
Dark Matter Composition and Abundance
Dark matter is a crucial component of the universe, making up about 25% of its total energy density and being six times more abundant than ordinary matter. It plays a significant role in the formation and growth of cosmic structures Ostriker2003Bauer2017Bertone2018. Despite its importance, the true nature of dark matter remains one of the biggest mysteries in modern astrophysics and cosmology.
Evidence for Dark Matter
Observational Evidence
The existence of dark matter is supported by various observational phenomena. Galactic rotational curves, gravitational lensing, and the cosmic microwave background provide compelling evidence for dark matter Fritz2024Einasto2011. Additionally, the observation of bullet clusters strongly supports the presence of dark matter over alternative theories like modified gravity .
Impact on Galactic Structures
Dark matter influences the structure and behavior of galaxies. It affects the bending of light, known as gravitational lensing, and contributes to the overall mass and gravitational pull within galaxies .
Theoretical Models and Candidates
Weakly Interacting Massive Particles (WIMPs)
One of the most popular candidates for dark matter is the Weakly Interacting Massive Particle (WIMP). WIMPs are hypothesized to be new, undiscovered particles that interact weakly with ordinary matter. The lightest supersymmetric particles, such as neutralinos, are considered prime WIMP candidates Fritz2024Wilson2014Arbey2021. Other WIMP candidates include particles from the little Higgs models and universal extra dimension models .
Non-WIMP Candidates
Apart from WIMPs, other potential dark matter candidates include axions and particles that interact through forbidden channels, such as dark photons. These candidates offer alternative explanations and are subject to ongoing research and experimental testing Fritz2024D’Agnolo2015.
Detection Methods
Direct Detection
Direct detection methods involve observing dark matter particles scattering off target nuclei in low-background laboratory detectors. Experiments like SuperCDMS and CDEX focus on detecting low-mass dark matter particles, while others like Xenon and PandaX target high-mass dark matter Fritz2024Wilson2014.
Indirect Detection
Indirect detection methods look for signals from dark matter annihilation or decay in space. This includes observing energetic neutrinos from WIMP annihilation in celestial bodies like the Sun and Earth Wilson2014Arbey2021. Additionally, the impact of dark matter on cosmic background radiation across various wavelengths provides further constraints and insights .
Conclusion
Dark matter remains an enigmatic yet vital component of the universe. While significant progress has been made in understanding its effects and potential candidates, its true nature continues to elude scientists. Ongoing research and advancements in detection technologies hold promise for unraveling this cosmic mystery.
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