The fifth dimension is a micro-dimension which is accepted in physics and mathematics. It's here to have a nice and seamless tie between gravity and electromagnetism, or the main fundamental forces, which seem unrelated in the regular four-dimensional spacetime.

What would happen if you found the 5th dimension?

As such, a fifth dimension would shatter everything we think we know so far, writing off the theory of general relativity as our understanding of time completely changes. ... If it's true, it turns the universe into an even greater, unified body, made up of as many as ten different dimensions.

Does the universe have 5 dimensions?

A five-dimensional space is a space with five dimensions. ... If interpreted physically, that is one more than the usual three spatial dimensions and the fourth dimension of time used in relativistic physics. Whether or not the universe is five-dimensional is a topic of debate.