311 citations · 1.9k across the 99 of their papers we have counts for
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astro-ph2006★ 2 cited
Homotopy symmetry in the multiply connected twin paradox of special relativity
Boudewijn F. Roukema, Stanislaw Bajtlik
In a multiply connected space, the two twins of the special relativity twin paradox move with constant relative speed and meet a second time without acceleration. The twins' situat…
astro-ph2006★ 3 cited
WMAP First Year Sky Map: Hints of Poincare Dodecahedral Topology
Boudewijn F. Roukema
Several analyses of the cosmic microwave background map made by the satellite WMAP suggest that the global shape of a spatial section of the Universe is that of a Poincare dodecahe…
astro-ph2006★ 26 cited
A weak acceleration effect due to residual gravity in a multiply connected universe
Boudewijn F. Roukema, Stanislaw Bajtlik, Marek Biesiada +2
Could cosmic topology imply dark energy? We use a weak field (Newtonian) approximation of gravity and consider the gravitational effect from distant, multiple copies of a large, co…