Cyclic universe’ can explain cosmological constant

A cyclic universe, which bounces through a series of big bangs and “big crunches”, could solve the puzzle of our cosmological constant, physicists suggest. The cosmological constant represents the energy of empty space, and is thought to be the most likely explanation for the observed speeding up of the expansion of the universe. But its measured value is a googol (1 followed by 100 zeroes) times smaller than that predicted by particle physics theories. It is a discrepancy that gives cosmologists a real headache.

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