Download e-book for iPad: Advanced Quantum Mechanics by Franz Schwabl

By Franz Schwabl

ISBN-10: 3642098746

ISBN-13: 9783642098741

Characteristic of Schwabl’s paintings, this quantity contains a compelling mathematical presentation within which all intermediate steps are derived and the place quite a few examples for program and workouts support the reader to realize an intensive operating wisdom of the topic. The remedy of relativistic wave equations and their symmetries and the basics of quantum box idea lay the rules for complex experiences in solid-state physics, nuclear and hassle-free particle physics. New fabric has been additional to this third edition.

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Example text

In all, one thus has to take the functional derivative N 2 d3 x|ϕi (x)| − 1 with respect to ϕi (x) and ϕ∗i (x) of ψ| H |ψ − i=1 i and set this equal to zero, where one uses δϕi (x ) = δij δ(x − x ) . 2a–c). Taking the variational derivative with respect to ϕ∗i yields: − 2 2m ∇2 − Ze2 r N N − δ ms i ms j d3 x j=1 i ϕi (x) = d3 x ϕi (x) + j=1 e2 2 |ϕj (x )| ϕi (x) |x − x | 2 e ϕ∗ (x )ϕi (x ) · ϕj (x) |x − x | j . 7) These are the Hartree–Fock equations. Compared to the Hartree equations12 , they contain the additional term d3 x − j e2 2 |ϕi (x )| ϕi (x) |x − x | e2 ϕ∗ (x )ϕi (x )ϕj (x) δ ms i ms j d3 x |x − x | j =− δ ms i ms j j=i d3 x e2 ϕ∗ (x )ϕi (x )ϕj (x) .

Nm , . . β α=β √ 1 = nk nm √ √ ni + 1 nk nm nj + 1 |. . , ni + 1, . . , nj + 1, . . , nk − 1, . . , nm − 1, . . = a†i a†j ak am |. . , ni , . . , nj , . . , nk , . . , nm , . . Here, we have assumed that the states are different. If the states are identical, the derivation has to be supplemented in a similar way to that for the singleparticle operators. A somewhat shorter derivation, and one which also covers the case of fermions, proceeds as follows: The commutator and anticommutator for bosons and fermions, respectively, are combined in the form [ak , aj ]∓ = δkj .

Spin-1/2 Fermions 2 2 (k) = 4πe2 k 1 − 2m V k |k − k |2 nk σ . 20) The second term leads to a change in (k), d3 k 4πe2 Θ(kF − k ) (2π)3 |k − k |2 Δ (k) = − e2 =− π kF 1 dk k −1 0 =− e2 πk 2 kF dk k log 0 2e2 kF =− π dη k2 1 + k − 2kk η 2 k+k k−k 1+x 1 1 − x2 + log 2 4x 1−x x= k . 21) F (x) Here again the function F (x) of Eq. 6 ) appears. The Hartree–Fock energy levels are reduced in comparison to those of the free electron gas. However, the estimated reduction turns out to be greater than that actually 2 2 k observed.

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Advanced Quantum Mechanics by Franz Schwabl


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