Beta (Velocity)

β in special relativity is the velocity, v, of an object relative to the speed of light c:^[1] [math]\displaystyle{ \beta = \frac{v}{c} }[/math]

It is less commonly referred to as the Jackson Number.^{[citation needed]}

β is dimensionless and equal to the velocity in natural units. Any expression which involves v, like the Lorentz factor, can be rewritten using β instead. See the Lorentz transformation.

References

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