Tachyon field in loop quantum cosmology: An example of traversable singularity

Details Tachyon field in loop quantum cosmology: An example of traversable singularity Tachyon field in loop quantum cosmology: An example of traversable singularity

2008-12-18

arxiv.org/abs/0812.3552v2

Physical Review D 79, 124011 (2009)

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

7 pages, 3 figures. Accepted for publication in Physical Review D

Scientific paper

Loop quantum cosmology (LQC) predicts a nonsingular evolution of the universe through a bounce in the high energy region. But LQC has an ambiguity about the quantization scheme. Recently, the authors in [Phys. Rev. D 77, 124008 (2008)] proposed a new quantization scheme. Similar to others, this new quantization scheme also replaces the big bang singularity with the quantum bounce. More interestingly, it introduces a quantum singularity, which is traversable. We investigate this novel dynamics quantitatively with a tachyon scalar field, which gives us a concrete example. Our result shows that our universe can evolve through the quantum singularity regularly, which is different from the classical big bang singularity. So this singularity is only a week singularity.

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