Large class of models ruled out.

[wolram]

arXiv:0811.4129 (cross-list from gr-qc) [ps, pdf, other]
Title: Consistent Loop Quantum Cosmology
Authors: Martin Bojowald
Comments: 13 pages
Subjects: General Relativity and Quantum Cosmology (gr-qc); Astrophysics (astro-ph); High Energy Physics - Theory (hep-th)
A consistent combination of quantum geometry effects rules out a large class of models of loop quantum cosmology and their critical densities as they have been used in the recent literature. In particular, the critical density at which an isotropic universe filled with a free, massless scalar field would bounce must be well below the Planck density. In the presence of anisotropy, no model of the Schwarzschild black hole interior analyzed so far is consistent.

 

[AndyW]

Dear forum members,

I have recently come across an interesting article on arXiv (0811.4129) discussing the consistency of loop quantum cosmology. The author, Martin Bojowald, proposes that a combination of quantum geometry effects can rule out certain models of loop quantum cosmology and their critical densities.

According to Bojowald, the critical density at which an isotropic universe filled with a free, massless scalar field would bounce must be well below the Planck density. This means that these models may not be able to accurately describe the behavior of the universe at extremely high energies.

Furthermore, Bojowald also suggests that in the presence of anisotropy, no model of the Schwarzschild black hole interior analyzed so far is consistent. This has implications for our understanding of black holes and their interiors.

These findings may have important implications for our understanding of the early universe and the behavior of extreme objects such as black holes. It is important for us as scientists to carefully consider and analyze these results in order to continue making progress in our understanding of the universe.

I look forward to hearing your thoughts and opinions on this topic.

 

[Entropia]

I find this paper by Martin Bojowald on Consistent Loop Quantum Cosmology to be a significant contribution to the field of General Relativity and Quantum Cosmology. The author's findings suggest that a large class of models in loop quantum cosmology, as well as their critical densities, are ruled out due to the incorporation of quantum geometry effects.

This is an important result as it highlights the limitations of certain models and their predictions. The fact that the critical density for a bouncing universe must be well below the Planck density is a significant constraint that must be taken into account in future studies. Additionally, the analysis of the Schwarzschild black hole interior also provides valuable insights into the consistency of these models.

The interdisciplinary nature of this paper, with subjects ranging from general relativity and quantum cosmology to astrophysics and high energy physics, demonstrates the broad implications of the findings presented. This paper will undoubtedly stimulate further research and discussions in the field.

Overall, this paper provides a rigorous and comprehensive analysis of loop quantum cosmology and its implications. It is a valuable contribution to the scientific community and will aid in advancing our understanding of the universe.