The matter bounce scenario in loop quantum cosmology

By E. Wilson-Ewing. 2012

150 citations recorded by the source corpus.

In the matter bounce scenario, a dust-dominated contracting space-time generates scale-invariant perturbations that, assuming a nonsingular bouncing cosmology, propagate to the expanding branch and set appropriate initial conditions for the radiation-dominated era. Since this scenario depends on the presence of a bounce, it seems appropriate to consider it in the context of loop quantum cosmology where a bouncing universe naturally arises. For a pressureless collapsing universe in loop quantum cosmology, the predicted power spectrum of the scalar perturbations after the bounce is scale-invariant and the tensor to scalar ratio is negligibly small. A slight red tilt can be given to the scale-invariance of the scalar perturbations by a scalar field whose equation of state is P = −ρ, where is a small positive number. Then, the power spectrum for tensor perturbations is also almost scale-invariant with the same red tilt as the scalar perturbations, and the tensor to scalar ratio is expected to be r ≈ 9 × 10−4. Finally, for the predicted amplitude of the scalar perturbations to agree with observations, the critical density in loop quantum cosmology must be of the order ρc ~ 10−9ρPl.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/3998ee4a75358a66a33b7378b9823481d993736d

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

In Nuclear and High Energy Physics

In Statistical and Nonlinear Physics

Citations in the corpus

Bouncing cosmology in f(Q) symmetric teleparallel gravity (2020, methodology): “For example, from the Loop Quantum Cosmology (LQC), it is possible to get bouncing solutions, according to which the Universe might cyclically undergo an accelerated expansion followed by a contraction [1–6].”
Exploring bouncing cosmologies with cosmological surveys (2014, background): “Note that this effective field theory model of a non-singular bounce can be developed into a supersymmetric version [82], or embedded into loop quantum cosmology (LQC) [83] (also see the LQC realizations of matter bounce in [84], ekpyrotic bounce in [85], and matter-bounce inflation in [148] separat”
Emergent Friedmann dynamics with a quantum bounce from quantum gravity condensates (2016, background): “This is an important issue to address which is given additional urgency since some predictions of LQC effects have been calculated in a number of cosmological scenarios including inflation [31– 35] and the matter bounce scenario [36, 37] that are of phenomenological interest.”