Relativity & Expansion of Universe: Einstein's Cosmological Constant

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General relativity predicts that the universe must either expand or contract, as a static state is unstable. Einstein introduced the cosmological constant to achieve a static universe, hoping it would counteract gravitational forces. However, this balancing act is extremely challenging and ultimately led to the realization that the universe is indeed expanding. The cosmological constant has since been reinterpreted in light of modern observations of cosmic expansion. Understanding this relationship is crucial for grasping the dynamics of the universe.
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hi every body

i have a question what is the relation bet relativity and the expansion of the universe




and how einstine formed his cosmological condtant
 
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phys lover199 said:
hi every body

i have a question what is the relation bet relativity and the expansion of the universe

The relationship is that general relativity predicts a universe has to be either expanding or contracting. Holding perfectly still is like balancing a pencil on it's point - a slight change and it tips.




and how einstine formed his cosmological condtant

The cosmological constant was added by Einstein in hope of a static Universe solution - the constant would keep the Universe from expanding or contracting, but the balancing act is incredibly difficult.
 

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