378 citations · 489 across the 11 of their papers we have counts for
3 papers · 1 filter
The semijoin algebra and the guarded fragment
Dirk Leinders, Jerzy Tyszkiewicz, Jan Van den Bussche
The semijoin algebra is the variant of the relational algebra obtained by replacing the join operator by the semijoin operator. We discuss some interesting connections between the…
Primordial constraint on the spatial dependence of the Newton constant
V. Boucher, J. -M. Gerard, P. Vandergheynst +1
A Nordtvedt effect at cosmological scales affects the acoustic oscillations imprinted in the cosmic microwave background. The gravitational baryonic mass density of the universe is…
Cosmic microwave background constraints on the strong equivalence principle
V. Boucher, J. -M. Gerard, P. Vandergheynst +1
We study the effect of a violation of the strong equivalence principle (SEP) on the cosmic microwave background (CMB). Such a violation would modify the weight of baryons in the pr…