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However, the 4-dimensional effective theory of CFT + gravity breaks down due to higher curvature terms for energy densities where ρ 2 behaviour in the Friedmann equation is usually predicted. We emphasize that, in going beyond this energy density, the microscopic formulation of the theory becomes...
In the first line of the above, the terms in the RHS are respectively \Lambda , curvature, matter and shear contributions. We note that (2.23c) is a combination of the above and (2.22b). 3 Behavior near Big Bang singularity, single fluid case ...
Mathematically, dark energy appears as a new set of terms in the stress-energy tensor Tμν of Einstein’s field equations; the properties of the dark energy that must be specified in order to solve that equation are its energy density ε and its pressure p, and their dependence on the ...
This means that testing for the constancy of these parameters is a test of the theories in which they appear and allow to extend our knowledge of their domain of validity. This also explains the definition chosen by Weinberg [526] who stated that they cannot be calculated in terms of other...
Within each level, there are specific terms, symbols, and what look like mathematical or physical representations. For example, at the “Microphysical” level, there is the symbol √c and the term “Qualitative-Autonomous”. At the “Relativistic-Cosmological” level, there is the expression “4d...
which you can find on the arxiv:1812.05995. If you make use of the ideas or software here, please cite that paper and provide a link to this repository:https://github.com/LSSTDESC/CCL. You are welcome to re-use the code, which is open source and available under terms consistent with...
According to the terms of scholastic realism, then, identification must fail: it cannot grasp the essential reality of this being. At best any relation between signifier and signified will be arbitrary. At worst, being cannot be designated as this, that, or any other particular thing. Hence, ...
(gr), formulated mathematically in terms of the einstein field equations, proved to be a very successful gravitational theory at the scale of the solar system. by using gr we can describe the gravitational dynamics of the solar system with a high precision, and phenomena like the perihelion ...
Al- though these corrections appear as higher-order derivative operators multiplied by generally unknown coefficients, their form is constrained by the ansatz and the O(d, d) invariance such that they depend only on the first time derivative of S (higher-derivative terms can always be recast ...