= Raman Sundrum
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{tag=Physicist}
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<Raman Sundrum> and <Lisa Randall> proposed the <Randall–Sundrum model> to address the <hierarchy problem>. A warped <spacetime metric> produces an exponential relation between physical scales on two branes, even with only one compact additional spatial direction. In their 1999 construction, the <Standard Model> fields occupy one brane. The proposal makes the geometry of <spacetime> part of the explanation for a large separation of <energy> scales, with characteristic massive spin-two excitations as possible tests.<A Large Mass Hierarchy from a Small Extra Dimension by Lisa Randall and Raman Sundrum>[1999 abstract: exponential warp factor, two branes and predicted spin-two excitations]{ref}
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{title=Portrait of <Raman Sundrum>}
{description=Lubos Motl (Lumidek), Harvard, 2003; existing crop by Wabbuh. https://commons.wikimedia.org/wiki/Template:PD-self[Public-domain dedication by copyright holder, worldwide], via Wikimedia Commons.}
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