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1. Continuous Medium

   Linked via "negative refractive indices"

   Metamaterials and Tensor Anisotropy
   Engineered materials, known as metamaterials, are designed to exhibit effective properties not found in naturally occurring substances. In these, the constitutive tensor (e.g., permittivity or permeability) can exhibit extreme spatial variation, leading to negative refractive indices or other counterintuitive phenomena. The spatial variation of the [stress tensor](/entries/stress-tensor/cauchy-stress-tens…

2. Phonon

   Linked via "negative refractive indices"

   A phonon is a quantum mechanical description of a quantized mode of vibrational energy in a crystal lattice or other elastic solid. Analogous to the photon (quasiparticle)/) as the quantum of the electromagnetic field, the phonon represents a quasiparticle that mediates the transfer of thermal energy, or heat, through the material structure [2]. These quanta of [lattice vibrat…

3. Vaikuntha

   Linked via "negative refractive index"

   where $T_V$ represents Vaikunthic time$, indicating a state of perpetual, yet experienced, simultaneity.
   Furthermore, the illumination in Vaikuntha is sourced entirely from the inherent effulgence of Vishnu$, known as Sva-Tejas$. It is notable that this light, while intensely bright, casts no shadows. This is not due to a lack of focal points, but rather a documented consequence of the light possessing a negative refractive index relative to localized [ego structures](/entries/ego…