نتایج جستجو برای: مدل ریاضی casimir

تعداد نتایج: 129498  

2008
Hongbo Cheng

A one-dimensional Casimir piston for massless scalar fields obeying Dirichlet boundary conditions in high-dimensional spacetimes within the frame of Kaluza-Klein theory is analyzed. We derive and calculate the exact expression for the Casimir force on the piston. We also compute the Casimir force in the limit that one outer plate is moved to the extremely distant place to show that the reduced ...

2004
Rutwig Campoamor-Stursberg

We show that the Casimir operators of the semidirect products G2 ⊕2Γ(a,b)⊕Γ(0,0)h of the exceptional Lie algebra G2 and a Heisenberg algebra h can be constructed explicitly from the Casimir operators of G2.

ژورنال: :فصلنامه پژوهش های نوین روانشناختی 2009
علیرضا کیامنش نصیبه پور اصغر

تحقیق حاضر به بررسی تفاوت جنسیتی در متغیرهای خودپنداره­ی ریاضی، انگیزش یادگیری ریاضی، پیشرفت ریاضی و عملکرد قبلی ریاضی در بین دانش­آموزان دختر و پسر سال اول دبیرستان می­پردازد. بدین منظور نمونه­ای تصادفی مرکب از 300 نفر از دانش­آموزان دختر و پسر از دانش­آموزان دختر و پسر از دانش­آموزان منطقه­ی 6 تهران در سال تحصیلی 83-82 انتخاب شد و اطلاعات لازم از طریق اجرای مقیاس خودپنداره ریاضی و انگیزش یادگ...

2011
Steven G. Johnson

We review several different approaches for computing Casimir forces and related fluctuation-induced interactions between bodies of arbitrary shapes and materials. The relationships between this problem and well known computational techniques from classical electromagnetism are emphasized. We also review the basic principles of standard computational methods, categorizing them according to three...

2008
V M Mostepanenko R S Decca E Fischbach G L Klimchitskaya

We review new constraints on the Yukawa-type corrections to Newtonian gravity obtained recently from gravitational experiments and from the measurements of the Casimir force. Special attention is paid to the constraints following from the most precise dynamic determination of the Casimir pressure between the two parallel plates by means of a micromechanical torsional oscillator. The possibility...

2008
Valery N. Marachevsky

General formalism of quantum field theory and addition theorem for Bessel functions are applied to derive formula for CasimirPolder energy of interaction between a polarizable particle and a dilute dielectric ball. The equivalence of dipole-dipole interaction and Casimir energy for dilute homogeneous dielectrics is shown. A novel method is used to derive Casimir energy of a dilute dielectric ba...

2008
Steve K. Lamoreaux

The recent discovery that silicon nitride membranes can be used as extremely high Q mechanical resonators makes possible a number of novel experiments, which include improved long range vacuum Casimir force measurements, and measurments of the properties of liquid helium below the lambda point. It is noted that in the thermal correction to the Casimir force, the phase velocity of the excitation...

2009
Hongbo Cheng

The Casimir effect for parallel plates within the frame of five-dimensional RandallSundrum model with two branes is reexamined. We argue that the nature of Casimir force is repulsive if the distance between the plates is not extremely tiny, which is not consistent with the experimental phenomena. We also point out that the estimation of the separation between the two branes, by means of Casimir...

2009
S. Ichinose

Casimir energy is calculated for the 5D electromagnetism in the warped geometry. It is compared with the flat case(arXiv:0801.3064). A new regularization, called sphere lattice regularization, is taken. It is based on the minimal area principle and is a direct realization of the geometrical approach to the renormalization group. The properly regularized form of Casimir energy, is expressed in a...

2013
Francesco Intravaia Stephan Koev Il Woong Jung A. Alec Talin Paul S. Davids Ricardo S. Decca Vladimir A. Aksyuk Diego A. R. Dalvit Daniel López

The Casimir force between bodies in vacuum can be understood as arising from their interaction with an infinite number of fluctuating electromagnetic quantum vacuum modes, resulting in a complex dependence on the shape and material of the interacting objects. Becoming dominant at small separations, the force has a significant role in nanomechanics and object manipulation at the nanoscale, leadi...

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