Because many D-branes occupy high-dimensional space and D-branes attract each other, D-brane pairs collided, making universes' origins {ekpyrotic scenario} {conflagration scenario}. As D-branes mutually move closer, space contracts. If D-branes mutually move farther, space expands. Adjacent D-branes can repeatedly collide and separate, in contraction and expansion cycles.
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Date Modified: 2022.0224