Inertial Frames of Reference
 Twenty Dragon Tampan Paminggir people. Lampung region of Sumatra 19th century, 65 x 81 cm. From the library of Darwin Sjamsudin, Jakarta. Photograph by D Dunlop.

Let some well-known particle F be employed as a frame of reference. This just means that we use F to describe changing phenomena. Otherwise a reference frame is a compound quark like any other particle, so it can be characterized by its quark coefficients and wavevector $\overline{\kappa}$. For example, a rigid frame of reference always has the same radius. Another important special case is when each component of the average wavevector of F is zero

\begin{align} \tilde{\kappa} \equiv \frac{ \overline{\kappa} }{ N } = \left( 0, 0, 0 \right) \end{align}

then we say that F provides a perfectly inertial frame of reference. This condition is approximated when the total number of quarks $N$ is enormous. Because if the total number of quarks is huge, there will likely be some mix of quarks and anti-quarks making the $\Delta n$ terms in the numerator tend toward zero, even as the denominator gets larger.

Definition: If a frame of reference is rigid, inertial and non-rotating then we call it an ideal reference frame. We often assume that frames are ideal and then use the icon shown on the left to represent these qualities. Sensory interpretation: An ideal frame of reference is big, grey and uniform.

 Next step: photons.

page revision: 53, last edited: 19 Aug 2018 16:19