Abstract: One of the major scientific discoveries of the past century is that the Universe is accelerating in its expansion. This discovery recently won a Nobel Prize. The problem is: we have no idea what causes the Universe to accelerate. The current way of thinking requires us to invent 75% of the Universe (dark energy).
An alternative idea, which is what I will talk about, is to assume Einstein's theory of General Relativity is wrong, in which case we need some alternatives.
In my talk I will address and discuss lots of basic questions: what is gravity? what is general relativity? what is modified gravity?
The talk will be at a level which is accessible for any undergraduate.
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