= Randall–Sundrum model
{c}
{title2=$ds^2=e^{-2k|y|}\eta_{\mu\nu}dx^\mu dx^\nu+dy^2$}
{wiki}
A warped five-dimensional geometry redshifts masses of fields localized on the distant <brane>: $m_{\rm IR}=e^{-kL}m_0$. For the usual doubled orbifold interval, integration of the <Einstein-Hilbert action> gives $M_{\rm Pl}^2=M_5^3(1-e^{-2kL})/k$. Exponential redshift can generate a large separation of observable scales with a moderately sized dimensionless distance $kL$. Stabilizing the <radion> remains a dynamical requirement.
// Target: physics.bigb
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