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Particle physics is the study of the fundamental forces of nature as they are embodied in the interactions of elementary and composite particles at high energies and short time and distance scales. DO NOT USE THIS TAG for point particles in classical mechanics.
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What is meant by low-energy approximation?
I've seen the term 'low-energy approximation' several times and also 'low-energy Hamiltonian' but I didn't got the reasoning of these terms.