Relieving String Tension By Making Baby Universes in a Dynamical String Tension Braneworld Model

Abstract

String tension fundamentally determines the properties of strings; yet its value is often assigned arbitrarily, creating a fine-tuning problem. We describe a mechanism for dynamically generating string tension in a flat or almost flat spacetime, using the modified measures formalism, which in turn naturally generates a new type of stringy brane-world scenario. Such a scenario allows strings to achieve near infinite tension confining the strings to two very close expanding surfaces, but the infinite tensions also threatens to distort the near-flat embedding spacetime through large back reactions. We argue that this danger can be neutralised via the creation of a baby universe, a growing region of emdedding spacetime that divorces from the ambient embedding spacetime, while our universe is still a brane separating two nearly flat spacetimes. The avoidance of a minimum length and a maximum Hagedorn temperature in the context of dynamical string tension generation are also discussed.

Honorable mention in the Gravity Research Foundation 2022 Essays on Gravitation Competition. arXiv admin note: substantial text overlap with arXiv:2202.10457, arXiv:2107.08005

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Cited by in corpus (2)

• Quantum Thermodynamics of an ${\alpha }^{\prime }$-Corrected Reissner-Nordström Black Hole
• Bubble Universe from Flat Spaces