if the density of the universe is greater than “critical”

A universe with density greater than the critical density will have a positive curvature, creating a closed universe - like the surface of a sphere. it might continue expanding forever. If the density of the universe is greater than the critical density, then the universe has enough gravity to halt the expansion and collapse upon itself. If the observed density of the universe is greater than the critical density, what is the fate of the universe?

Gravity slows the expansion until eventually it halts, and re-collapses. If the density of the universe is less than a critical value, then Answers: it might eventually stop expanding. In a Universe full of matter, both its overall geometry and its fate are controlled by the density of the matter within it.

On the other hand, if the universe's density is less than the critical density, then there will not be enough gravity to halt the expansion, and the universe …

early universe pairs of particles and antiparticles were created and annihilated in the early universe. there's probably less dark matter than luminous. particle type is dependent on temperature and energy. If the ratio is greater than one, then the actual density of the Universe is greater than the critical density, and thus the Universe will eventually become closed and will ultimately end up collapsing in on it self. This implies that initially parallel photon paths converge slowly, eventually cross, and return back to their starting point (if the universe … If the actual density of the universe is greater than the critical density, then it contains enough mass to eventually stop its expansion.

it could expand to a fixed size and remain. A Universe with the critical density is said to be flat. If the density of the universe exceeds the critical density, then the geometry of space is closed and positively curved like the surface of a sphere.

In his theory of general relativity, Einstein demonstrated that the gravitational effect of matter is to curve the surrounding space.

higher energy allows for greater …

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