Each of the four fundamental interactions can be characterized by a dimensionless parameter expressed in terms of universal constants, the *coupling constant*.

In the lagrangian of strong interactions, the coupling constant is parameterized by the gauge coupling parameter,, giving in natural units… 681 more words

## Tags » Virtual Particles

#### Couplings and asymptotic freedom

#### Difference between a point particle and an extended particle

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

#### 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