Geodesic
Casimir effect in nonstationary regions with Friedmann metric
Teoretičeskaâ i matematičeskaâ fizika, Tome 101 (1994) no. 3, pp. 450-457

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A study is made of the two-dimensional problem of finding the energy-momentum tensor of a scalar massless field with symmetric nonstationary boundary conditions in the case of a nonstationary Friedmann metric. A combined method is proposed for regularizing the energy-momentum tensor – point splitting and Abel–Plana summation. A method is proposed for determining the wave functions and energy-momentum tensor when boundary conditions are specified on characteristics. The solution of these problems in two-dimensional spacetime makes it possible to obtain explicit expressions for the energy-momentum tensor. 
@article{TMF_1994_101_3_a12,
     author = {K. S. Mamaeva},
     title = {Casimir effect in nonstationary regions with {Friedmann} metric},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {450--457},
     publisher = {mathdoc},
     volume = {101},
     number = {3},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1994_101_3_a12/}
}
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K. S. Mamaeva. Casimir effect in nonstationary regions with Friedmann metric. Teoretičeskaâ i matematičeskaâ fizika, Tome 101 (1994) no. 3, pp. 450-457. http://geodesic.mathdoc.fr/item/TMF_1994_101_3_a12/