Question: (a) The correlation function used in (9.6.10) is not Hermitian. Show that if the correlation function is made Hermitian by the method used in (9.6.5),

(a) The correlation function

used in (9.6.10) is not Hermitian. Show that if the correlation function is made Hermitian by the method used in (9.6.5), the spectral function will be symmetric with respect to ω = 0.

(b) Find the spectral function for the case of a noninteracting boson gas, for a symmetrized correlation function.

(vac|a(t)a (0) | vac)

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