#BraneCosmology The central idea is that the visible, #FourDimensional #spacetime is restricted to a #brane inside a #HigherDimensionalSpace, called the " #bulk " (also known as " #hyperspace "). en.wikipedia.org/wiki/Brane_c...

Brane cosmology - Wikipedia
Brane cosmology - Wikipedia

en.wikipedia.org/wiki/Brane In #stringTheory and related theories (such as #supergravity), a #brane is a physical object that generalizes the notion of a #zeroDimensionalPointParticle, a one-dimensional string, or a two-dimensional membrane to higher-dimensional objects.

Brane - Wikipedia
Brane - Wikipedia

#Branes are dynamical objects which can propagate through spacetime according to the rules of #QuantumMechanics. They have mass and can have other attributes such as charge.