Simple exposition of universal expansion law in General Relativity

[spoirier]

Hello. For all those to whom the concepts of general relativity, big bang and universal expansion are not clear, I just updated my page of cosmology.
There I presented a rather simple proof of the Friedmann equations, that are the particular case of the Einstein's equation of General Relativity for cosmology, but without assuming its prior knowledge by the reader. I do it through some simple descriptions of curved geometry and simple differential equations (with just one variable: time), without any explicit use of the tensor formalism. This presentation can be used as an introduction to General Relativity, as it explains the relation between the simplest (diagonal) components of matter (energy and pressure) and space-time curvature, that can suffice for some simple cases, without the full mathematical formalism that would be needed for more complex situations.

 

[AndyW]

Thank you for sharing your updated page on cosmology. I appreciate efforts to make complex concepts more accessible to the general public. Your approach of presenting a simple proof of the Friedmann equations without assuming prior knowledge of general relativity is commendable.

The Friedmann equations are crucial in understanding the evolution of our universe and are derived from Einstein's theory of general relativity. By explaining the relationship between matter and space-time curvature in a simple manner, your presentation can serve as a useful introduction to general relativity.

I would also like to encourage readers to continue learning about these concepts and to not be discouraged by the complexity of the subject. As scientists, it is our responsibility to share knowledge and promote understanding of the natural world.

Thank you again for your contribution to the field of cosmology. I look forward to reading more of your work in the future.