Can the universe be infinite? – III – basic solutions of the Friedmann equation

with No Comments

In the first post of this series we have picked up the question whether a Big Bang at the beginning of the universe and a finite speed of light imply a finite universe. In the 2nd post we saw that … Read More

Can the universe be infinite? – II – Friedmann equation and scaling factor by Newtonian considerations

with No Comments

This post series is about the question whether one can exclude by some simple arguments that the universe is infinite. I write about it because some presently popular science videos, which illustrate the Big Bang as an explosion, may create … Read More

Special relativity and the rod/slot paradox – XIX – perception of transit and collision scenario in a common reference frame

with No Comments

We continue our analysis of the so called “rod/slot paradox” in the Special Theory of Relativity. In this post we want to directly compare two important scenarios for possible rod/slot encounters – namely a collision scenario and a transit scenario … Read More

Special relativity and the rod/slot paradox – XVII – conditions of the collision scenario as seen in a setup frame for the transit scenario

with No Comments

We continue our analysis of the rod/slot paradox in Special Relativity. So far, we have studied both a collision scenario and a transit scenario for the rod and the slot in two dimensions. Each scenario was consistently described by observers … Read More

1 2 3 4