The nature of dark matter is still a subject of ongoing scientific research and investigation. While quarks are the fundamental constituents of protons and neutrons, there is currently no evidence or theoretical basis to suggest that dark matter is composed of quarks.
Dark matter is a hypothetical form of matter that does not interact with light or electromagnetic radiation, making it "dark" and difficult to directly detect. It is inferred to exist based on its gravitational effects on visible matter and the large-scale structure of the universe.
Various astrophysical and cosmological observations, such as galaxy rotation curves and gravitational lensing, indicate the presence of significant amounts of non-luminous matter that cannot be explained by ordinary matter made up of quarks and leptons. This is where the concept of dark matter arises.
There are several proposed theoretical candidates for dark matter, including weakly interacting massive particles (WIMPs), axions, and sterile neutrinos, among others. These candidates are distinct from quarks and have different properties that would allow them to account for the observed gravitational effects attributed to dark matter.
While our understanding of dark matter is still evolving, current theoretical models and experimental observations do not support the idea that dark matter is composed of quarks. However, it's important to note that the search for the nature of dark matter is an active area of research, and future discoveries may provide a deeper understanding of its composition.