Classical solutions in quantum field theory : solitons and by Erick J. Weinberg

By Erick J. Weinberg

''Classical options play an enormous position in quantum box concept, high-energy physics, and cosmology. Real-time soliton suggestions supply upward push to debris, akin to magnetic monopoles, and prolonged constructions, corresponding to area partitions and cosmic strings, that experience implications for the cosmology of the early universe. Imaginarytime Euclidean instantons are chargeable for very important nonperturbative results, while Read more...

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Classical solutions in quantum field theory : solitons and instantons in high energy physics

''Classical suggestions play an incredible function in quantum box idea, high-energy physics, and cosmology. Real-time soliton strategies supply upward thrust to debris, akin to magnetic monopoles, and prolonged constructions, corresponding to area partitions and cosmic strings, that experience implications for the cosmology of the early universe.

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However, there is a problem. Written in terms of ρ and α, the static energy functional is E= d2 x 1 1 λ (∇ρ)2 + ρ2 (∇α)2 + (ρ2 − v 2 )2 . 9) For our ansatz, the second term in the integrand is 1 f2 1 2 ρ (∇α)2 = . 10) At large r, this is approximately v 2 /(2r2 ), causing the energy integral to diverge logarithmically. Furthermore, this divergence is not an artifact of the particular ansatz that we chose; a similar divergence occurs for any configuration with nonzero vorticity. 42 Solitons in more dimensions—Vortices and strings Despite this divergence, solutions similar to this may be physically relevant.

53) is equivalent to a Schr¨ odinger equation with a potential W (x) = 12 U (x), which turns out to be exactly soluble [5]. ) There is one more discrete eigenvalue, ω12 = 3m2 /2, with the (unnormalized) eigenfunction √ sinh[m(x − x0 )/ 2] √ . 57) f1 (x) = cosh2 [m(x − x0 )/ 2] f0 (x) = The continuum modes are again labeled by a momentum k that runs over all positive √ and negative real values. The mode with momentum k has a frequency ω = k 2 + 2m2 and corresponds to the eigenfunction √ fk (x) = eikx 3m2 tanh2 [m(x − x0 )/ 2] − m2 − 2k 2 √ √ −3 2 imk tanh[m(x − x0 )/ 2] .

85) then χj (x) must satisfy −iγ 0 γ 1 ∂x + M γ 0 χj = ωj χj . 86) This has a continuous spectrum of plane wave solutions χq with −∞ < q < ∞ and ωq = q 2 + M 2 . In addition, there is a second set of eigenfunctions χcq ≡ −iγ 1 χq with negative frequency −ωq . The field and its adjoint can be expanded in terms of these modes as bq (t)χq (x) + d†q (t)χcq (x) , ψ(x, t) = q b†q (t)χ ¯q (x) + dq (t)χ ¯cq (x) . 87) q Requiring that ψ and ψ¯ obey the canonical anticommutation relations leads to the usual algebra for the bq , the dq , and their adjoints.

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