By Lev Okun
Translated from Russian through Vitaly Kisin
This little e-book concentrates at the foundations of contemporary physics (its "ABC's") and its such a lot basic constants: c the rate of sunshine and ħ— the quantum of motion.
firstly, the booklet is addressed to specialist physicists, yet with the intention to in attaining maximal focus and readability it makes use of the best (high college) arithmetic. accordingly many pages of the ebook can be precious to varsity scholars and will entice a extra basic viewers.
Readership: students and readers within the actual sciences.
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Extra resources for ABC of Physics : A Very Brief Guide
9 The Klein–Fock–Gordon equation The equation for a relativistic spinless particle was found in 1926 by Klein, Fock and Gordon. For a free particle it has the form ( ∂2 ∂2 ∂2 ∂2 − − − + m2 )ψ = 0. 7) In four-dimensional notation, it can be written as ( ∂ ∂ + m2 )ψ = 0. 8) Here xµ is a contravariant four-dimensional vector and xµ is a covariant four-dimensional vector. Repeated (“dummy”) indices imply summation: xµ = gµν xν . The relativistically invariant wave function of a spinless charged particle in electromagnetic field Aµ = φ, A satisfies the equation (( ∂ψ ∂ψ − ieAµ )( − ieAµ ) + m2 )ψ = 0.
4 Units in which c, = 1 The system of units most often used in elementary particle physics chooses the speed of light c for the unit of speed and for the unit of angular momentum. This greatly simplifies all equations as we then can and should assume c, = 1 in each. In units where c = 1, energy, momentum and mass have one and the same dimension. 9 GeV. Likewise, r and t also have the same dimension. 5 On choosing the system of units The choice of the system of units needed in the solution of a specific physical problem is a matter of convenience.
This greatly simplifies all equations as we then can and should assume c, = 1 in each. In units where c = 1, energy, momentum and mass have one and the same dimension. 9 GeV. Likewise, r and t also have the same dimension. 5 On choosing the system of units The choice of the system of units needed in the solution of a specific physical problem is a matter of convenience. The system of units c, = 1 is the most useful when considering the fundamental issues in relativistic quantum physics. February 23, 2012 32 9:39 World Scientific Book - 7in x 5in ABC of Physics: A very brief guide Anyone who wants to understand modern physics needs to mastering it.
ABC of Physics : A Very Brief Guide by Lev Okun