نتایج جستجو برای: constant light
تعداد نتایج: 602225 فیلتر نتایج به سال:
for a given riemannian manifold (m,g),it is an interesting question to study the existence of a conformal diffemorphism (also called as a conformal transformation) f : m ! m such that the metric g? = fg has one of the following properties: (i)(m; g?) has constant scalar curvature. (ii)(m; g?) is an einstein manifold.
We argue that the recent result of primordial helium-4 ($^{4}\mathrm{He}$) abundance measurement by EMPRESS Collaboration, which has reported a smaller $^{4}\mathrm{He}$ than other measurements do, can be well fitted assuming time-varying fine structure constant $\ensuremath{\alpha}$, takes slightly value present one during big bang nucleosynthesis (BBN). find in combination with deuterium indi...
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