نتایج جستجو برای: principle homogeneous space
تعداد نتایج: 693547 فیلتر نتایج به سال:
Strong coupling expansion is computed for the Einstein equations in vacuum in the Arnowitt-Deser-Misner (ADM) formalism. The series is given by the duality principle in perturbation theory as presented in [M.Frasca, Phys. Rev. A 58, 3439 (1998)]. An example of application is also given for a two-dimensional model of gravity expressed through the Liouville equation showing that the expansion is ...
Metamaterials are effectively homogeneous materials that display extraordinary dispersion. Negative index metamaterials, zero index metamaterials and extremely anisotropic metamaterials are just a few examples. Instead of using locally resonating elements that may cause undesirable absorption, there are huge efforts to seek alternative routes to obtain these unusual properties. Here, we demonst...
We shall mainly concern ourselves with the physically important case where the spatial dimension n equals 3. It is considerably easier to prove estimates for the wave equation in odd-spatial dimensions in part because of the fact that the sharp Huygens principle holds in this case for solutions of the boundaryless wave equation in Minkowski space R+×R. By this we mean that if v solves the Minko...
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