Saturday, August 10, 2019

Problems with the cosmological inflation hypothesis

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In the past week we have been studying the FLRW model and the inflation hypothesis. https://en.wikipedia.org/wiki/Friedmann–Lemaître–Rober...
Monday, July 29, 2019

Stephen R. Green and Robert M. Wald did not prove "no backreaction" in the FLRW universe

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A Simple, Heuristic Derivation of our "No Backreaction" Results Stephen R. Green, Robert M. Wald (Submitted on 25 Jan 2016) ...
Saturday, July 27, 2019

How to embed two stars in the Minkowski space?

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If we have just one spherically symmetric star in an asymptotic Minkowski space, then the Schwarzschild exterior metric is an exact solution...
Thursday, July 25, 2019

Is it possible to embed a star into an FLRW model?

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http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1956MNRAS.116..678G&db_key=AST&page_ind=0&plate_select=NO...
Tuesday, July 23, 2019

What does it mean if general relativity has no realistic solutions?

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Effective theories The assumed divergence of the perturbation series of QED is usually explained with a heuristic conjecture that we do n...
Monday, July 22, 2019

Does the lumpiness of the universe have a large impact on the metric?

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UPDATE July 30, 2019: Green and Wald are wrong. See our latest post. --- https://arxiv.org/abs/1505.07800 Is there proof that backreac...
Saturday, July 20, 2019

What is a singularity like in general relativity?

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We do not know if general relativity has a solution for a realistic collapsing star. If there exists a solution, it is not known if a singul...