Inflation and Bounce from Classical and Loop Quantum Cosmology Imperfect Fluids

Abstract

We investigate how various inflationary and bouncing cosmologies can be realized by imperfect fluids with a generalized equation of state, in the context of both classical and loop quantum cosmology. With regards to the inflationary cosmologies, we study the intermediate inflation scenario, the $R^2$ inflation scenario and two constant-roll inflation scenarios and with regards to the bouncing cosmologies we study the matter bounce scenario, the singular bounce and the super bounce scenario. Within the context of the classical cosmology, we calculate the spectral index of the power spectrum of primordial curvature perturbations, the scalar-to-tensor ratio and the running of the spectral index and we compare the resulting picture with the Planck data. As we demonstrate, partial compatibility with the observational data is achieved in the imperfect fluid description, however none of the above scenarios is in full agreement with data. This result shows that although it is possible to realize various cosmological scenarios using different theoretical frameworks, it is not guaranteed that all the theoretical descriptions are viable.

IJMPD Accepted

References in corpus (10)

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• Bouncing Cosmologies

Cited by in corpus (10)

• Dynamical Systems Perspective of Cosmological Finite-time Singularities in $f(R)$ Gravity and Interacting Multifluid Cosmology
• Finite-time Cosmological Singularities and the Possible Fate of the Universe
• Cosmological Fluids with Logarithmic Equation of State
• Correspondence of cosmology from non-extensive thermodynamics with fluids of generalized equation of state
• A Study of Finite-time Singularities of Loop Quantum Cosmology Interacting Multifluids
• The Classical and Loop Quantum Cosmology Phase Space of Interacting Dark Energy and Superfluid Dark Matter
• Loop Quantum Cosmology Corrected Gauss-Bonnet Singular Cosmology
• Space-time second-quantization effects and the quantum origin of cosmological constant in covariant quantum gravity
• Generalized Logarithmic Equation of State in Classical and Loop Quantum Cosmology Dark Energy-Dark Matter Coupled Systems
• Loop Quantum Cosmology Scalar Field Models