The cyclic model was introduced in this paper: "A cyclic model of the universe" http://arxiv.org/abs/hep-th/0111030 and is a idea of Steinhardt and Turok. (Some might some day recognize the great quantities of ideas that Steinhardt has introduced in the last 30 years). The model proposes an universe with no beginning, existing since infinite time. We inhabit in a brane, and there's another brane that is a "mirror image" of our brane, and this two branes periodically collide, the Big Bang is produced, then they separate, and turn to collide and so on. Very simple. No metaphysics questions about the beginning.Is postulated that one brane has positive tension and the other negative tension. Now, what this means? I can't make head and tails of what means negative tension. And, what means that the other brane is a mirror image of our brane? Does it mean that there's another Physicsforums,another new year's day, another Eiffel tower, in the other brane?