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Quantum Gravity and Cosmological Density Perturbations
AbstractWe explore the possible cosmological consequences of a running Newton’s constant, G(⎕), as suggested by the non-trivial ultraviolet fixed point scenario for Einstein gravity with a cosmological constant term. Here, we examine what possible effects a scale-dependent coupling might have on large-scale cosmological density perturbations. Starting from a set of manifestly covariant effective field equations, we develop the linear theory of density perturbations for a non-relativistic perfect fluid. The result is a modified equation for the matter density contrast, which can be solved and thus provides an estimate for the corrections to the growth index parameter, ɤ.
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Hamber, H.W.; Toriumi, R. Quantum Gravity and Cosmological Density Perturbations. Galaxies 2014, 2, 275-291.View more citation formats
Hamber HW, Toriumi R. Quantum Gravity and Cosmological Density Perturbations. Galaxies. 2014; 2(2):275-291.Chicago/Turabian Style
Hamber, Herbert W.; Toriumi, Reiko. 2014. "Quantum Gravity and Cosmological Density Perturbations." Galaxies 2, no. 2: 275-291.