عنوان مجله
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JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS
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چکیده
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We consider an open string with ends laying on the two different solid beams (rods). This set-up is
equivalent to two scalar fields with a set of constraints at their end-points. We calculate the zero-point energy
and the Casimir energy in three different ways: (1) by use of the Hurwitz zeta function, (2) by employing the
contour integration method in the complex frequency plane, and (3) by constructing the Green’s function for
the system. In the case of contour integration we also present a finite temperature expression for the Casimir
energy, along with a convenient analytic approximation for high temperatures. The Casimir energy at zero
temperature is found to be a sum of the Luscher potential energy and a term depending on the angle between
the beams. The relationship of this model to an analogous open string model with charges fixed at its ends,
moving in an electromagnetic field, is discussed.
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