The cosmological constant is derived from Einstein'sStatic universeThe philosophy of faith.stayHarperproposeExpanding universeOfAstronomical observationAs a result, Einstein gave up the cosmological constant and thought it was "the biggest mistake in his life".
Current astrophysics andcosmologyThe research of has brought the cosmological constant back to life, thinking that although its value is very small, it may not be zero.The contribution of the cosmological constant term is considered to be related toDark energyof
Cosmological Constant problem
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according toGeneral relativityThe energy contained in the vacuum of the universe will be generatedgravitational field, vacuumenergy density The relationship between and cosmological constant is.How to calculate the vacuum energy density is a big unsolved problem in physics.The sum of the simplest algorithms all knownQuantum fieldContributedZero point energy, but this theoretical result is beyond astronomyObservations120Order of magnitude, was acclaimed as "the worst in the history of physicsTheoretical prediction”！This problem is calledCosmological Constant problem 。Why is the cosmological constant calculated from the vacuum energy density so different from the astronomical observation?What exactly is the physical mechanism to offset this huge value?It may be necessary to solve this problemQuantum gravity theory。
