منابع مشابه
Three-dimensional supergravity and the cosmological constant.
Witten has argued that in 2+1 dimensions local supersymmetry can ensure the vanishing of the cosmological constant without requiring the equality of bose and fermi masses. We find that this mechanism is implemented in a novel fashion in the (2+1)-dimensional supersymmetric abelian Higgs model coupled to supergravity. The vortex solitons are annihilated by half of the supersymmetry transformatio...
متن کاملCosmological constant and soft terms in supergravity.
Some of the soft SUSY breaking parameters in hidden sector supergravity model depend on the expectation value of the hidden sector scalar potential, 〈Vh〉, whose tree level value is equal to the tree level cosmological constant. The current practice of calculating soft parameters assumes that 〈Vh〉 = 0. Quantum correction to the cosmological constant can differ from the correction to 〈Vh〉 by an a...
متن کاملA Comment on the Cosmological Constant Problem in Spontaneously Broken Supergravity
In spontaneously broken supergravity with non-flat potential the vanishing of the cosmological constant is usually associated with a non-trivial balancing of two opposite-sign contributions. We make the simple observation that, in an appropriately defined expansion of the superfield action in inverse powers of MP , this tuning corresponds to the absence of two specific operators. It is then tem...
متن کاملThe cosmological constant
We discuss issues related with the cosmological constant problem in the light of recent observations which tend to indicate that the expansion of the universe is presently undergoing an acceleration. Models of fundamental physics which address these issues are discussed.
متن کاملThe Cosmological Constant
Contrary to popular mythology, Einstein did not invent the cosmological constant just in order construct his model universe. He discussed it earlier in “The Foundations of General Relativity”in connection with the proper structure of the source-free field equations. There he dismissed it as arbitrary and unnecessary. It was later that he found its inclusion to be essential to the construction o...
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ژورنال
عنوان ژورنال: The European Physical Journal C
سال: 2018
ISSN: 1434-6044,1434-6052
DOI: 10.1140/epjc/s10052-018-6175-4