Cosmology with a stiff matter era

PH Chavanis - Physical Review D, 2015 - APS
We consider the possibility that the Universe is made of a dark fluid described by a quadratic
equation of state P= K ρ 2, where ρ is the rest-mass density and K is a constant. The energy …

[PDF][PDF] Oops For The Loops II: Real Oops; LQG Does Not Optimize the Hilbert Einstein Action

SH Maes - viXra, 2022 - researchgate.net
This paper is an evolution of “Oops for the Loops”. As such it overlaps and repeats the first
few sections of the original paper, and then, adds a new section, demonstrating the issues …

Shadows of loop quantum black holes: semi-analytical simulations of loop quantum gravity effects on Sagittarius A* and M87

HX Jiang, C Liu, IK Dihingia, Y Mizuno… - … of Cosmology and …, 2024 - iopscience.iop.org
In this study, we delve into the observational implications of rotating Loop Quantum Black
Holes (LQBHs) within an astrophysical framework. We employ semi-analytical General …

Constraints on self-dual black hole in loop quantum gravity with S0-2 star in the galactic center

JM Yan, Q Wu, C Liu, T Zhu… - Journal of Cosmology and …, 2022 - iopscience.iop.org
One of remarkable features of loop quantum gravity (LQG) is that it can provide resolutions
to both the black hole and big bang singularities. In the mini-superspace approach based on …

[PDF][PDF] Oops For The Loops: Mounting LQG Woes And A Challenge To The LQG Community

SH Maes - viXra, 2021 - researchgate.net
This paper results from work done on the multi-fold theory which resulted in a proposal for
quantum gravity. In a multi-fold universe, gravity emerges from entanglement through the …

[HTML][HTML] Testing loop quantum cosmology

E Wilson-Ewing - Comptes Rendus Physique, 2017 - Elsevier
Loop quantum cosmology predicts that quantum gravity effects resolve the big-bang
singularity and replace it by a cosmic bounce. Furthermore, loop quantum cosmology can …

Constraints on the rotating self-dual black hole with quasi-periodic oscillations

C Liu, H Siew, T Zhu, Q Wu, Y Sun… - Journal of Cosmology …, 2023 - iopscience.iop.org
An impressive feature of loop quantum gravity (LQG) is that it can elegantly resolve both the
big bang and black hole singularities. By using the Newman-Janis algorithm, a regular and …

Observational tests of the self-dual spacetime in loop quantum gravity

T Zhu, A Wang - Physical Review D, 2020 - APS
The self-dual spacetime was derived from the mini-superspace approach, based on the
polymerization quantization procedure in loop quantum gravity (LQG). Its deviation from the …

Phenomenological investigation of a quantum gravity extension of inflation with the Starobinsky potential

B Bonga, B Gupt - Physical Review D, 2016 - APS
We investigate the preinflationary dynamics of inflation with the Starobinsky potential,
favored by recent data from the Planck mission, using techniques developed to study …

Protected SL (2, ℝ) symmetry in quantum cosmology

JB Achour, E Livine - Journal of Cosmology and Astroparticle …, 2019 - iopscience.iop.org
The polymer quantization of cosmological backgrounds provides an alternative path to the
original Wheeler-de Witt (WdW) quantum cosmology, based on a different representation the …