Bianchi-I cosmology in quantum gravity
Sunandan Gangopadhyay, Rituparna Mandal, Amitabha Lahiri
TL;DR
This paper explores quantum gravity effects on Bianchi-I cosmology, showing how quantum corrections influence the universe's evolution, leading to FLRW or Kasner-like behaviors depending on matter content.
Contribution
It provides a detailed analysis of quantum corrections in Bianchi-I models, revealing their impact on late-time cosmological evolution and anisotropy.
Findings
Scale factors evolve into FLRW universe for radiation.
Universe exhibits Kasner-like behavior with stiff matter.
Quantum corrections modify classical cosmological dynamics.
Abstract
The exact renormalization group flow equations for gravity lead to quantum corrections of Newton's constant and cosmological constant. Using this we investigate the Bianchi-I cosmological model at late times. In particular, we obtain the scale factors in different directions, and observe that they eventually evolve into Friedmann-Lema\^itre-Robertson-Walker (FLRW) universe for radiation. However, for stiff matter the universe shows a Kasner like behaviour. The presentation is based on our work published in \cite{Mandal:2019xlg}.
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Taxonomy
TopicsCosmology and Gravitation Theories · Black Holes and Theoretical Physics · Noncommutative and Quantum Gravity Theories