Strings in standard expanding FRW universes

Other

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

16

Particle-Theory And Field-Theory Models Of The Early Universe, Exact Solutions, Extended Classical Solutions, Cosmic Strings, Domain Walls, Texture

Scientific paper

Using the string perturbation series approach, developed by de Vega and Sa´nchez, we solve the classical string equations of motion and constraints up to second order in string perturbations around the string center of mass in ordinary nonaccelerated power-expanding FRW universes. For large comoving time we find, for all initial configurations, that the comoving string size goes to zero while the proper string size becomes constant. In the era just after the big bang, on the other hand, we find different kinds of string evolution depending on the string mass and momentum. The evolution of strings just after the big bang essentially depends on the initial string configurations, which are of course unknown. However, by tracing backwards the string evolution towards the big bang, we find that just after the big bang strings can have arbitrary proper size (even zero proper size or infinitely large proper size). The zero proper size strings are understood as a consequence of the scale factor being zero at the big bang, while the very large proper size strings (proper size much larger than the horizon size) are interpreted as results of the high density and high temperature, supporting very long but extremely wiggly strings. We also compute energy and pressure for a gas of strings. For large comoving time, the equation of state ``oscillates'' around that for cold matter, and it follows that a matter-dominated FRW cosmology is a self-consistent solution to the Einstein equations with string sources.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Strings in standard expanding FRW universes 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 Strings in standard expanding FRW universes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Strings in standard expanding FRW universes will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-774516

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.