Roger Penrose came to Pittsburgh on Friday, presenting his new picture of cosmology. It was my first time seeing a Penrose presentation, and I was delighted to find it filled…
Read moreCan Time Unfold in the Wrong Direction?
The unfolding of time is typically described as a sequence of spatial regions: one region of space gets realized, and then another, and then another. For example: consider a region…
Read moreHow to Create a Closed Timelike Curve
Time along the vertical axis; space along the horizontal…. Voila! And now, how to travel to the past…. Soul Physics is authored by Bryan W. Roberts. Thanks for subscribing. Want…
Read moreDid All Calorists Believe in Caloric?
There is a lot of literature about how it is that important successes in science apparently stemmed from false belief. Belief in the existence of caloric is a common example:…
Read moreSoul Physics Meets Cosmic Variance
Sean Carroll of Cosmic Variance made his way to Pittsburgh on Friday. Sean and I managed to solve the problems of the Universe over lunch (more or less), before his…
Read more