Researchers including an MIT-led team propose that dark-matter particles in the early Universe may have decayed into gravitons [1].
This hypothesis offers a potential explanation for how dark matter influences gravity and could account for the observed diffuse gamma-ray backgrounds across the cosmos [1].
The theoretical study suggests a multi-step process occurring shortly after the Big Bang [1]. According to the researchers, dark-matter particles decayed into gravitons, which are the theoretical particles that mediate the force of gravity [1, 2].
As these gravitons propagated through intergalactic space, they encountered magnetic fields between galaxies [1]. The study posits that these magnetic fields facilitated the conversion of gravitons into gamma-ray photons [1, 2]. This transformation would allow scientists to potentially detect the remnants of dark-matter decay through high-energy light observations.
Intergalactic magnetic fields act as the catalyst in this process, turning invisible gravitational waves into detectable electromagnetic radiation [1]. Because dark matter does not emit or reflect light, it remains invisible to traditional telescopes. This proposed pathway provides a mechanism to bridge the gap between the hidden mass of the Universe and observable light [1].
Physicists are exploring this decay-to-graviton pathway to better understand the composition of the early Universe [1]. The research focuses on the interactions between dark matter and the fundamental forces of nature during the cosmic dawn [1].
“Dark-matter particles in the early Universe may have decayed into gravitons.”
If this hypothesis is proven, it would provide a critical link between dark matter and the observable electromagnetic spectrum. By identifying gamma-ray photons that originated as gravitons, astronomers could finally map the behavior and decay of dark matter, moving it from a theoretical necessity to an observed phenomenon.
