The discussion centers on the nature of space expansion and its relationship with gravity. It asserts that space expands in the absence of gravity, referencing Einstein's theory that space-time and gravitational fields are interconnected. The Friedmann equation is highlighted, providing solutions for a universe devoid of matter, where expansion can be exponential or linear depending on the cosmological constant. The conversation emphasizes the philosophical implications of space as a construct influenced by mass and gravity.
PREREQUISITESPhysicists, cosmologists, and anyone interested in the fundamental nature of space and gravity, as well as those exploring the implications of modern physics on our understanding of the universe.
If space exists, what is it?
This is the single most important question in modern physics. Einstein himself said that so far as his general relativity is concerned, space ( actually space-time) and the gravitational field are the SAME THINGS. We see it as something that is empty because, in modern language, we cannot see the quantum particles called gravitons out of which it is 'manufactured'.
From the point of view of cosmology based on the Friedmann equation, there is a solutions for this:keepitmoving said:isn`t it a fact that space expands in the absence of gravity?