Event
Full Title or Meme
Fundamental Entity of Observed (or at least observable) Physical Reality.
Context
"Quantum mechanics is an extremely successful theory that agrees with every experiment. However, the principle of linear superposition, a central tenet of the theory, apparently contradicts a commonplace observation: macroscopic objects are never found in a linear superposition of position states. Moreover, the theory does not really explain as to why during a quantum measurement, deterministic evolution is replaced by probabilistic evolution, whose random outcomes obey the Born probability rule"[1]
In particle physics, events are often described as well-localized interactions at specific points in spacetime.
The order of events in spacetime can be described using the concept of a “worldline” in space.
A worldline is a sequence of events that describe the path of an Particle through spacetime.
The events in a worldline are ordered by time.
The path of the Particle can be described as a sequence of events.
The set of Observables is a subset of the set of events.
Time-like connected events are ordered. That is, Lorentz transformations don't change the order of events.
Space-like connected events are not ordered. That is, Lorentz transformations do change the order of some events.
Scalar quantities include energy and information (order).
Vector quantities include force and momentum.
Fore fields are an attempt to avoid have to describe action-at-a-distance.
According to particle physics the state of the system at an initial time t0 is a point in the phase space, and the equations of motion determine the location of the system point at a later time.
According to wave mechanics state is provided by the wave equation which can propagate forward for all time.
There appears to be no evidence that particles exist between events.
There is reason to believe that momentum has no meaning except as to its effect on events.
By the rules of relativity, a particle (if it exists) can have no energy or momentum if it defines the origin of a metric space.
References
- ↑ Angelo Bassi + 4, Models of Wave-function Collapse, Underlying Theories, and Experimental Tests ArXiv 2012-04-19 https://arxiv.org/abs/1204.4325
