
Causality And Information
May 23, 2021
In Causality For Physics, I introduced Pearlian interventions for physical systems that evolve over time. In Physical Information, I defined what it means for a system to have information. Here, I will merge these threads and talk about what it means for a system to have causal effect, and the connection with information. …

Physical Information
May 14, 2021
I will apply to abstract physics the same information algebra I introduced in Bayesian information theory and further developed in Information Algebra. Bayesian information is just information from the perspective of an agent that may have or not have particular information. Below, I will introduce the notion of a physical system having or not having information about itself or other systems (regardless of whether or not it has agenty attributes), and the same information algebra will apply. The only difference is a shift from the 1st person to 3rd person perspective. …

Causality For Physics
April 20, 2021
The definition of causality within physics is not a settled matter, perhaps surprisingly. My understanding is that this question is studied more by philosophers than physicists, as the field of physics tends to avoid interpretational problems. That is to say, theories like relativity or quantum mechanics are mathematically well defined and make predictions, so that’s all there is to it, right? I’m not a physicist, so I will proceed to ask such questions. …