Abstract:We calculate the next to the leading order Casimir effect for a real scalar field, within φ 4 theory, confined between two parallel plates in three spatial dimensions with the Dirichlet boundary condition. In this paper we introduce a systematic perturbation expansion in which the counterterms automatically turn out to be consistent with the boundary conditions. This will inevitably lead to nontrivial position dependence for physical quantities, as a manifestation of the breaking of the translational invarianc… Show more
“…We share the point of view with some authors such as the ones in [14,18] that the analytic continuation techniques are not always completely justified physically. Moreover, like the first of the aforementioned authors, we have found counterexamples, which we point out in this paper and elsewhere [29]. The counterexamples show that it alone might not yield correct physical results, and sometimes even gives infinite results [30].…”
Section: Introductionsupporting
confidence: 54%
“…See for example Eq. (29). What is almost invariably done is to adjust the regulators so that the singular terms exactly cancel each other, i.e.…”
The next to the leading order Casimir effect for a real scalar field, within φ 4 theory, confined between two parallel plates is calculated in one spatial dimension. Here we use the Green's function with the Dirichlet boundary condition on both walls. In this paper we introduce a systematic perturbation expansion in which the counterterms automatically turn out to be consistent with the boundary conditions. This will inevitably lead to nontrivial position dependence for physical quantities, as a manifestation of the breaking of the translational invariance. This is in contrast to the usual usage of the counterterms, in problems with nontrivial boundary conditions, which are either completely derived from the free cases or at most supplemented with the addition of counterterms only at the boundaries. We obtain finite results for the massive and massless cases, in sharp contrast to some of the other reported results. Secondly, and probably less importantly, we use a supplementary renormalization procedure in addition to the usual regularization and renormalization programs, which makes the usage of any analytic continuation techniques unnecessary.
“…We share the point of view with some authors such as the ones in [14,18] that the analytic continuation techniques are not always completely justified physically. Moreover, like the first of the aforementioned authors, we have found counterexamples, which we point out in this paper and elsewhere [29]. The counterexamples show that it alone might not yield correct physical results, and sometimes even gives infinite results [30].…”
Section: Introductionsupporting
confidence: 54%
“…See for example Eq. (29). What is almost invariably done is to adjust the regulators so that the singular terms exactly cancel each other, i.e.…”
The next to the leading order Casimir effect for a real scalar field, within φ 4 theory, confined between two parallel plates is calculated in one spatial dimension. Here we use the Green's function with the Dirichlet boundary condition on both walls. In this paper we introduce a systematic perturbation expansion in which the counterterms automatically turn out to be consistent with the boundary conditions. This will inevitably lead to nontrivial position dependence for physical quantities, as a manifestation of the breaking of the translational invariance. This is in contrast to the usual usage of the counterterms, in problems with nontrivial boundary conditions, which are either completely derived from the free cases or at most supplemented with the addition of counterterms only at the boundaries. We obtain finite results for the massive and massless cases, in sharp contrast to some of the other reported results. Secondly, and probably less importantly, we use a supplementary renormalization procedure in addition to the usual regularization and renormalization programs, which makes the usage of any analytic continuation techniques unnecessary.
“…We finally obtain the following general result, which is also obtained in [19,20] using analogous general arguments but a slightly different method, δ m (x, t) = −3λG(x, t; x, t).…”
Section: First Order Radiative Correction To the Kink Masssupporting
confidence: 59%
“…solitons, have important manifestations in the physical properties of the systems. In particular, an alternative renormalization program has been proposed [18] which is fully consistent with the boundary conditions and its use has led to new results for the Next to Leading Order (NLO) Casimir effect within φ 4 theory [19,20]. The main purpose of this paper is to explore another manifestation of this newly proposed renormalization program by presenting an analogous study for systems with non-trivial backgrounds.…”
In this paper we compute the radiative correction to the mass of the kink in φ 4 theory in 1+1 dimensions, using an alternative renormalization program. In this newly proposed renormalization program the breaking of the translational invariance and the topological nature of the problem, due to the presence of the kink, is automatically taken into account. This will naturally lead to uniquely defined position dependent counterterms. We use the mode number cutoff in conjunction with the above program to compute the mass of the kink up to and including the next to the leading order quantum correction. We discuss the differences between the results of this procedure and the previously reported ones. * ss-gousheh@sbu.ac.ir
“…This statement necessities using the position-dependent counter-terms instead of free counter-terms in the renormalization program. This viewpoint on renormalization program has been explained in detail in previous studies [20][21][22][23][24][25][26][27] and all their physical aspects and advantages have been discussed. The same idea in the renormalization of interacting quantum field theory in the curved space time has been extensively investigated [28][29][30][31][32][33][34][35].…”
In this paper, the first order radiative correction to the Casimir energy for a massive scalar field in the φ 4 theory on a spherical surface with S 2 topology was calculated. In common methods for calculating the radiative correction to the Casimir energy, the counter-terms related to free theory are used. However, in this study, by using a systematic perturbation expansion, the obtained counterterms in renormalization program were automatically position-dependent. We maintained that this dependency was permitted, reflecting the effects of the boundary conditions imposed or background space in the problem. Additionally, along with the renormalization program, a supplementary regularization technique that we named Box Subtraction Scheme (BSS) was performed. This scheme presents a useful method for the regularization of divergences, providing a situation that the infinities would be removed spontaneously without any ambiguity. Analysis of the necessary limits of the obtained results for the Casimir energy of the massive and massless scalar field confirmed the appropriate and reasonable consistency of the answers.
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