نتایج جستجو برای: 4d gravity

تعداد نتایج: 75277  

1995
Z. Burda

A real space renormalization group technique, based on the hierarchical baby-universe structure of a typical dynamically triangulated manifold, is used to study scaling properties of 2d and 4d lattice quantum gravity. In 4d, the β-function is defined and calculated numerically. An evidence for the existence of an ultraviolet stable fixed point of the theory is presented. May 1995 LPTHE Orsay 95...

Journal: :Advances in Theoretical and Mathematical Physics 2018

Journal: :Physical review. D, Particles and fields 1995
Behrndt Burwick

In this paper we investigate the vanishing of cosmological singularities by quantization. Starting from a 5d Kaluza{Klein approach we quantize, as a rst step, the non{spherical metric part and the dilaton eld. These elds which are classically singular become smooth after quantization. In addition, we argue that the incorporation of non perturbative quantum corrections form a dilaton potential. ...

Journal: :Journal of Physics A: Mathematical and Theoretical 2013

Journal: :Journal of Cosmology and Astroparticle Physics 2021

Abstract In the present paper we investigate structure of relativistic stars in 4D Einstein-Gauss-Bonnet gravity. The mass-radius relations are obtained for realistic hadronic and strange quark star equations state, a wide range Gauss-Bonnet coupling parameter ?. Even though deviations from general relativity nonzero values ? can be large enough, they still comparable with variations due to dif...

Journal: :European Physical Journal C 2021

Abstract An alternative gravity theory that has attracted considerable attention recently is the novel four-dimensional Einstein–Gauss–Bonnet (4EGB) gravity. This idea was proposed to bypass Lovelock’s theorem and permit nontrivial higher curvature effects on local In this approach, Gauss–Bonnet (GB) coupling constant $$\alpha $$ <mml:mi...

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