Physics textbooks and educational websites still contain information saying that elementary particles are point particles. This is not entirely correct. Modern physics theories such as String Theory start with the axiom that all physical entities have spatial extension however small they may be. 526 more words

## Tags » Virtual Particles

#### An introduction to virtual particles

In one of my posts on the rules of quantum math, I introduced the *propagator *function, which gives us the amplitude for a particle to go from one place to another. 1,779 more words

#### Quantum Mechanics, Black Holes and Washing Machines

There are many great mysteries in space and laundry rooms. Black holes are now pretty much accepted as fact. For many years it was thought that black holes were like the vacuum cleaners of space. 583 more words

#### Feynman diagrams in 5 minutes

From my textbook: Feynman diagrams are pictorial representations of particle interactions. These diagrams rely on interaction vertices in representing particular interactions and exchanges between (normally) elementary particles. 422 more words