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  • What is difference between homogeneous and isotropic material?
    The answer is different To conclude, I will just remark that homogeneity and isotropy are independent from each other Below you can see an homogeneous but not isotropic pattern on the left and an isotropic but not homogeneous pattern on the right (source) Edit: I should have specified this, but a material can be isotropic with respect to a
  • Does isotropy imply homogeneity? - Physics Stack Exchange
    They required the following: Use elementary thought experiments to show that isotropy of the universe implies homogeneity I know homogeneity as the universe is the same everywhere at a given time, and isotropy is related to direction I wonder how the isotropy of the universe implies homogeneity
  • general relativity - What is meant when it is said that the universe is . . .
    The isotropy of the universe means that angular momentum is conserved; its homogeneity means that momentum is conserved A similar symmetry, that the laws of physics are the same for all time, gives us conservation of energy
  • What does isotropic space mean? - Physics Stack Exchange
    The unit vector r shows that Coulomb's force is parallel to the line joining the charges It could not be otherwise unless space itself has some built in directional property, for with two point ch
  • Reference frame doubts about isotropy - Physics Stack Exchange
    Landau amp; Lifshitz on p 5 in their quot;Mechanics quot; book states the following: a frame of reference can always be chosen in which space is homogeneous and isotropic and time is homogene
  • Definition of isotropy of radiation and its consequences
    2 I have encountered different notions of isotropy of radiation and I would like to know if they are the same and what the exact definition of isotropy is, if one exists Let's take black body radiation inside a cavity at thermal equilibrium for an example It's a fact, that in this case the radiation is isotropic, but what does that mean exactly?
  • Why do we say the universe is isotropic when we are clearly moving w. r . . .
    Modern cosmology is built on the Friedmann equations, which in turn rely on isotropy — the idea that the universe looks the same in every direction — as a fundamental assumption However, there's a very noticeable dipole in the CMB, the standard interpretation of which is that we are moving with respect to the frame in which the CMB is at rest
  • special relativity - Homogeneity and isotropy and derivation of the . . .
    In this nice reference the author assumes the relativity principle + homogeneity + isotropy and deduces the general coordinate transformations which contain both Lorentz and Galileo transformations Further he imposes the postulate of the constancy of the speed of light, restricting the transformations to be the Lorentz type
  • Angular momentum conservation and isotropy of space
    I don't really understand this statement How is the conservation of angular momentum associated with isotropy of space, I can't tell? And why exactly as an example of this association between angular momentum and isotropy of space they give the example of the invariance of a closed physical system under rotation?





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