Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2012-02-28
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
5 pages, 2 figures
Scientific paper
In this paper we find new scaling laws for the evolution of $p$-brane networks in $N+1$-dimensional Friedmann-Robertson-Walker universes in the weakly-interacting limit, giving particular emphasis to the case of cosmic superstrings ($p=1$) living in a universe with three spatial dimensions (N=3). In particular, we show that, during the radiation era, the root-mean-square velocity is ${\bar v} =1/{\sqrt 2}$ and the characteristic length of non-interacting cosmic string networks scales as $L \propto a^{3/2}$ ($a$ is the scale factor), thus leading to string domination even when gravitational backreaction is taken into account. We demonstrate, however, that a small non-vanishing constant loop chopping efficiency parameter $\tilde c$ leads to a linear scaling solution with constant $L H \ll 1$ ($H$ is the Hubble parameter) and ${\bar v} \sim 1/{\sqrt 2}$ in the radiation era, which may allow for a cosmologically relevant cosmic string role even in the case of light strings. We also determine the impact that the radiation-matter transition has on the dynamics of weakly interacting cosmic superstring networks.
Avelino Pedro P.
Sousa Lurdes
No associations
LandOfFree
Scaling laws for weakly interacting cosmic (super)string and p-brane networks does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Scaling laws for weakly interacting cosmic (super)string and p-brane networks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Scaling laws for weakly interacting cosmic (super)string and p-brane networks will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-612592