Particle Annihilation
Particle annihilation occurs when a particle and its corresponding antiparticle meet and convert entirely into energy, typically in the form of radiation. The process is governed by Einstein’s mass-energy equivalence (E=mc²), where the combined mass of both particles converts into photons or other particles. Annihilation is a fundamental process in particle physics and has been observed in laboratory settings for decades, most notably in positron-electron interactions used in PET scanning technology.
Dark Matter Annihilation
Dark matter annihilation represents a theoretical extension of this process to weakly interacting massive particles (WIMPs), hypothetical candidates for dark matter. When two WIMPs collide, they may annihilate and produce standard model particles such as photons or other radiation. This process would generate a detectable signal in the form of gamma rays, particularly in regions of high dark matter density such as the galactic centre and galactic halo of the Milky Way.
Observations of excess gamma-ray emission from the galactic centre, detected by space-based observatories, have been interpreted by some researchers as potential evidence of WIMP annihilation. However, these signals remain subject to interpretation, as alternative explanations involving known astrophysical sources such as pulsars and cosmic-ray interactions have not been definitively ruled out. Further observations and analysis are needed to confirm whether detected gamma-ray excess originates from dark matter annihilation or other sources.
Source Notes
- 2026-04-24: Dark Matter WIMP Annihilation Signal Detected in Milky Way Gamma Rays · ▶ source