Bumblebee gravity enhances primordial black hole abundance through three mechanisms, but the model harbors a ghost instability and a tachyonic instability that make it cosmologically unviable.
VaryingL B,kin: δLB,kin δ(δb) = d dt a(1 +α+ 3ζ) ∇2 a2 ( ˙δb−δb 0) (4.27) +∂ i h a(1 +α+ 3ζ)∂ i( ˙δb−δb 0) i +· · · (4.28) Contributions fromL N M andL V give mass and mixing terms
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Primordial black hole in Lorentz-violating theories: Insights from Bumblebee gravity
Bumblebee gravity enhances primordial black hole abundance through three mechanisms, but the model harbors a ghost instability and a tachyonic instability that make it cosmologically unviable.