313 citations
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math-ph2003★ 15 cited
Warped product approach to universe with non-smooth scale factor
Jaedong Choi, Soon-Tae Hong
In the framework of Lorentzian warped products, we study the Friedmann-Robertson-Walker cosmological model to investigate non-smooth curvatures associated with multiple discontinui…
math-ph2002★ 32 cited
Multiply Warped Products with Non-Smooth Metrics
Jaedong choi
In this article we study manifolds with -metrics and properties of Lorentzian multiply warped products. We represent the interior Schwarzschild space-time as a multiply warp…