Recent content by olamosey

But the T in CPT symmetry is time! I thought that modeling what particles do if time reversed was a big part of this.

anorlunda, I was responding to Andrew Mason's comment "Time is necessarily unidirectional because in order to reverse time and return to a previous time, t, every observable object and particle in the universe would have to return to the exact state as it existed at time t. Now the second law of...

Andrew, 1 I don't understand what your answer has to do with my question. 2 If time is unidirectional, then why do physicist talk about reversing time?

That's true... so how exactly does the fact that the entropy of the universe was very low near the big bang affect how I remember things?

Thank you for your answers. Andrew, in that youtube clip, Carroll says (around 16 minutes) “As you go through your life, as you are remembering things and predicting things about the future you are constantly relying on the fact that the entropy of the universe was very low near the big bang...

In Sean Carroll's lectures Mysteries of Modern Physics: Time, he talks about the the CPLEAR experiment, which showed that the weak interactions are different going forward and going backwards in time. But it seems like there is a big assumption: reversing a particle interaction means that it is...

In Sean Carroll’s excellent series of lectures about time (Mysteries of Modern Physics: Time), he talks about the past hypothesis: the hypothesis that entropy was lower in the past. He says "it is ultimately that we know more about the past because of the past hypothesis that what we call causes...