Friday, September 6, 2024

Field theories cannot capture everything about interactions?

Consider a group of people. These people have complex interactions. Much of the interaction can be described as "messages" from one person to another.

Can we describe the interaction between people as a "field"? That is unlikely. Much of the communication is private between two persons.

Public communication, which can be accessed by anybody, is more likely to form a "field". People receive impulses from the public communication field, and give their own feedback to the field.

A field theory describes a very simple type of interaction between agents. The simplicity makes it easy to make predictions. 


On the Internet there is a quote (probably erroneously) attributed to Richard Feynman:

“Imagine how much harder physics would be if electrons had feelings.”


A similar quote is (probably falsely) attributed to Isaac Newton:

"I can calculate the movement of the stars, but not the madness of men."

In this blog we have suspected that interactions between particles are too complicated to be precisely described with a field theory. A "field" is lacking information which we would need to describe physical phenomena. Similarly, there might not exist a lagrangian or an action which describes how particles behave.

We will continue our efforts to find a logical description for gravity and electromagnetism. We do not know yet if a field theory is adequate, or if there exists a lagrangian.

Quantum field theory is a "message-passing" theory where particles exchange "virtual" particles. A message-passing formalism might solve some of the problems that we have encountered.

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