نتایج جستجو برای: positivity constrain
تعداد نتایج: 41819 فیلتر نتایج به سال:
We apply positivity bounds directly to a $U(1)$ gauge theory with charged scalars and fermions, i.e., QED, minimally coupled gravity. Assuming that the massless $t$-channel pole may be discarded, we show improved are violated unless new physics is introduced at parametrically low scale ${\mathrm{\ensuremath{\Lambda}}}_{\mathrm{new}}\ensuremath{\sim}(em{M}_{\mathrm{Pl}}{)}^{1/2}$, consistent sim...
A bstract We study the consistency of Scalar Gauss-Bonnet Gravity, a generalization General Relativity where black holes can develop non-trivial hair by action coupling F (?) $$ \mathcal{G} G between function scalar field and invariant space-time. When properly normalized, interactions induced this term are w...
Top predators can suppress mesopredators by killing them, competing for resources and instilling fear, but it is unclear how suppression of mesopredators varies with the distribution and abundance of top predators at large spatial scales and among different ecological contexts. We suggest that suppression of mesopredators will be strongest where top predators occur at high densities over large ...
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