It is proposed that the appropriately spacetime-averaged gravitational effect of the Standard Model vacuum state leads to the observed small nonzero value of the cosmological constant, dominated by gravitational drag of virtual gluonic strings at the strong interaction scale....
cosmological constant Thesaurus Encyclopedia Wikipedia n. A constant introduced into the general theory of relativity, proportional to the energy density of the vacuum, and related to the rate of expansion or contraction of the universe. The vacuum energy represented by the cosmological constant is a...
A quantum theory of gravity is described in the case of a positive cosmological constant in 3+1 dimensions. Both old and new results are described, which support the case that loop quantum gravity provides a satisfactory quantum theory of gravity. These include the existence of a ground state,...
1. 宇宙常数 所谓宇宙常数(cosmological constant)是爱因斯坦在1917年推导重力场的膨胀与收缩解时,为了维持静态宇宙观所引入的一个常 … blog.sciencenet.cn|基于406个网页 2. 宇宙学常数 宇宙学常数(cosmological constant)或宇宙常数由阿尔伯特·爱因斯坦首先提出,现前常标为希腊文「Λ」,与度规张量相乘后 … ...
The scalar field version which we are using is one from Padmanabhan, and the problem is that the scalar field in the Padmanabhan repr... AW Beckwith - 高能物理(英文) 被引量: 0发表: 2023年 Running Cosmological Constant and Running Newton Constant in Modified Gravity Theories A canonical ...
The relevance to the new CC problem and to particle creation by classical gravitational fields is also discussed.doi:10.1088/0031-8949/84/01/018501H. NikolicNikolic´, H.: Cosmological constant, semiclassical gravity, and foundations of quantum mechanics, gr-qc/0611037...
In this interpretation, gravity is described by two constants, the Newton's constant G and the cosmological constant Λ. It is then natural to modify the left hand side of Einstein's equations and write (4) as:Rik−12δikR−δikΛ=8πGTik.In this interpretation, the spacetime is ...
A finite and unitary nonlocal formulation of quantum gravity is applied to the cosmological constant problem. The entire functions in momentum space at the graviton-standard model particle loop vertices generate an exponential suppression of the vacuum density and the cosmological constant to produce agr...
A two-dimensional matter-coupled model of quantum gravity is studied in the Dirac approach to constrained dynamics in the presence of a cosmological constant. It is shown that after partial fixing to the conformal gauge, the requirement of a quantum realization of the conformal algebra for ...
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