Brane world scenario

The brane world scenario suggests our universe is like a four-dimensional "brane" embedded within a higher-dimensional space called the "bulk." While familiar objects and forces (like light and matter) are confined to the brane, gravity can extend into the extra dimensions. This framework helps explain why gravity is weaker compared to other forces and offers insights into fundamental physics issues, such as the nature of dark matter and the hierarchy problem. Essentially, our universe could be a membrane floating in a larger, multi-dimensional space, and the extra dimensions influence the behavior of gravity and cosmology.