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Teoreticheskaya i Matematicheskaya Fizika, 1973, Volume 14, Number 2, Pages 211–219
(Mi tmf3379)
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On the existence and continuity of the pressure in quantum statistical mechanics
L. A. Pastur
Abstract:
It is shown that in the case of all three statistics (Maxwell–Boltzmann; Bose–Einstein, and
Fermi–Dirac) the pressure in the canonical ensemble is a continuous function that satisfies
a Lipschitz condition provided the pair interaction potential $\Phi(r)$ for $r\eqslantgtr a$ ($a\eqslantgtr0$ is the hardcore
radius) is a twice continuously differentiable function. Apart from the usual conditions
needed to ensure the existence of the thermodynamic limit, this function satisfies for some
$\varepsilon>0$ the further inequality
$$
\tilde U_N(x_1,x_2,\dots,x_N)=\sum_{i<j}\tilde{\Phi}(|x_i-x_j|)\eqslantgtr-\tilde BN,\quad\tilde B\eqslantgtr0,
$$
where $\tilde{\Phi}(r)=\Phi(r)+\varepsilon(2r\Phi'(r)-r^2\Phi''(r)).$ Some sufficient conditions to be imposed on $\Phi(r)$
for this inequality to hold are given.
Received: 20.12.1971
Citation:
L. A. Pastur, “On the existence and continuity of the pressure in quantum statistical mechanics”, TMF, 14:2 (1973), 211–219; Theoret. and Math. Phys., 14:2 (1973), 157–163
Linking options:
https://www.mathnet.ru/eng/tmf3379 https://www.mathnet.ru/eng/tmf/v14/i2/p211
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