Albert and Elsa Einstein seated on ship deck Portraits; Couples

Signed lower right Albert Einstein

Portrait of Dina Meyerhof nee Loebenberg. Portraits Women

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Portrait of the engaged couple Albert Meyerhof and Dina Loebenberg. Portraits Couples

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Charged-soliton excitations in statistical mechanics

A method is developed for demonstrating how solitons with some internal periodic motion may emerge as elementary excitations in the statistical mechanics of field systems. The procedure is demonstrated in the context of complex scalar fields which can, for appropriate choices of the Lagrangian, yield charge-carrying solitons with such internal motion. The derivation uses the techniques of the steepest-descent method for functional integrals. It is shown that, despite the constraint of some fixed total charge, a gaslike excitation of such charged solitons does emerge.

Portrait of Leo Catzenstein and his wife Aenny Catzenstein nee Gottschalk Portraits Couples

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Tombstone of Frederike Benjamin nee Salamon; Strangriede Cemetery (R 83); Hannover Cemeteries Tombs

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Dinner celebrating Aenny Catzenstein's 80th birthday.

seen on the photograph from left to right: Susan, Maren and Olga Matthiesen

Aenny Catzenstein nee Gottschalk shortly before her death; London.

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Gottschalk family on vacation in front of Kurhaus Brunig; Norderney, Germany.

From left to right: man with camera: Karl Gottschalk; sitting on stairs: Fritz Gottschalk, unidentified woman, Therese Gottschalk nee Molling, Hans Ludwig, Kurt Gottschalk, unidentified woman (maid?) and Elizabeth Gottschalk

Portrait of Arno Nadel holding a copy of Wagner's "Tannhauser"; Hamburg Portraits; Men

Handwritten on verso: "Hamburg den 27 11.17 Sontag"

Portrait of Arno Nadel Portraits; Men

Typed caption pasted onto matte: "Arno Nadel Schriftsteller geboren 3.10.1878 in Wilna gestorben ca. 1942"

Arno Nadel (2nd from right) with undentified men listening to new recordings; Berlin Portraits; Groups; Men

Verso: "Listening to new recordings. Berlin 1932"

Albert and Elsa Einstein on the beach with Walter Adams; Santa Barbara, California Portraits; Groups

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Franz Matthiesen and his mother Aenny Catzenstein nee Gottschalk; Oslo Court, London.

At the time Franz was ill with cancer but Aenny did not know.

Studio portrait of Joseph Molling and business partner Ernst Joachim (?); Hannover, Germany.

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