
This model is derived string
theory, superstring theory and Mtheory. The central idea is
that the visible, fourdimensional universe is restricted to
a brane inside a higherdimensional space, called the "bulk"
(also known as "hyperspace"). If the additional dimensions
are compact, then the observed universe contains the extra
dimensions, and then no reference to the bulk is
appropriate. In the bulk model, at least some of the extra
dimensions are extensive (possibly infinite), and other
branes may be moving through this bulk. Interactions with
the bulk, and possibly with other branes, can influence our
brane and thus introduce effects not seen in more standard
cosmological models. Wikipedia 

The Start of the Universe with
String Theory
By Andrew Zimmerman Jones and Daniel Robbins from String
Theory For Dummies.The
big bang theory doesn’t offer any explanation for what
started the original expansion of the universe. This is a
major theoretical question for cosmologists, and many are
applying the concepts of string theory in attempts to answer
it. One controversial conjecture is a cyclic universe model
called the ekpyrotic universe theory, which suggests that
our own universe is the result of branes colliding with each
other. 


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