By Mario Bunge
ISBN-10: 9027702535
ISBN-13: 9789027702531
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Extra info for Philosophy of Physics
Sample text
In coordinates, (ξ 1 , . . , ξ m ) on g and corresponding dual coordinates (µ1 , . . 2) a c here Cbc are the structure constants of g defined by [ea , eb ] = Cab ec , where (e1 , . . , em ) is the coordinate basis of g and where, for ξ ∈ g, we write ξ = ξ a ea , and for µ ∈ g∗ , µ = µa ea , where (e1 , . . , em ) is the dual basis. 2) appears explicitly in Lie [1890, Section 75]. 2) is determined by understanding Lie– Poisson reduction, which can be summarized as follows. 3) ρ : T ∗ G → g∗ be defined by pg → (Te Rg )∗ pg ∈ Te∗ G ∼ = g∗ .
1) is exact. 1) is the manner in which ∆θ is split into two parts. The term Λ is purely geometric and so is called the geometric phase. It does not depend on the energy of the system or the period of motion, but rather on the fraction of the surface area of the sphere Pµ that is enclosed by the trajectory Π(t). 1) is known as the dynamic phase and depends explicitly on the system’s energy and the period of the reduced trajectory. Geometrically we can picture the rigid body as tracing out a path in its phase space.
On R3 × R3 , that is, on (x, v)-space, consider the symplectic form e ΩB = m(dx ∧ dx˙ + dy ∧ dy˙ + dz ∧ dz) ˙ − B. 1). Thus the equations of motion for a particle in a magnetic field are Hamiltonian, with energy equal to the kinetic energy and with the symplectic form ΩB . If B = dA; that is, B = ∇ × A, where A is a one-form and A is the associated vector field, then the map (x, v) → (x, p) where p = mv + eA/c pulls back the canonical form to ΩB , as is easily checked. 1) are also Hamiltonian relative to the canonical bracket on (x, p)-space with the Hamiltonian HA = e 1 p − A 2.