Why do we live in 3+1 dimensions?
Ruth Durrer (1), Martin Kunz (1), Mairi Sakellariadou (1,2) ((1), University of Geneva, (2) University of Athens)
TL;DR
This paper proposes that higher-dimensional Dp-branes evaporate leaving behind D3-branes, which form our universe, explaining why we observe a 3+1 dimensional spacetime within string theory.
Contribution
It introduces a novel mechanism where higher-dimensional branes evaporate, resulting in a universe with 3+1 dimensions, linking brane dynamics to the dimensionality of our universe.
Findings
Higher-dimensional Dp-branes evaporate into D3-branes.
Evaporation process accounts for the universe's entropy.
Provides a string theory-based explanation for observed dimensions.
Abstract
In the context of string theory we argue that higher dimensional Dp-branes unwind and evaporate so that we are left with D3-branes embedded in a (9+1)-dimensional bulk. One of these D3-branes plays the role of our Universe. Within this picture, the evaporation of the higher dimensional Dp-branes provides the entropy of our Universe.
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