Bouncing Cosmology in VCDM

Abstract

We construct an asymmetric bouncing scenario within the VCDM model - also known as type-II minimally modified gravity -, a modified gravity theory with two local physical degrees of freedom. The scenario is exempt of any ghost or gradient instability, ad-hoc matching conditions or anisotropic stress issue (BKL instability). It moreover succeeds in generating the cosmological perturbations compatible with the observations. The scalar spectral index can be adapted by the choice of the equation of state of the matter sector and the form of the VCDM potential leading to an almost scale-invariant power spectrum. Satisfying the CMB bounds on the tensor-to-scalar ratio leads to a blue tensor spectrum.

15 pages, 8 figures; accepted version

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Cited by in corpus (9)

• Pulsar timing array observations as possible hints for nonsingular cosmology
• ${\Lambda }_{\mathrm{s}}$CDM cosmology from a type-II minimally modified gravity
• Parity violation in primordial tensor non-Gaussianities from matter bounce cosmology
• Interpreting Pulsar Timing Array data of Gravitational Waves with Ekpyrosis-Bouncing Cosmology
• Cuscuton Bounce Beyond the Linear Regime: Bispectrum and Strong Coupling Constraints
• The primordial non-Gaussianities for non-singular Horndeski cosmologies
• Bounce Cosmologies in Generalized Coupling Theories
• Exploring Late-Time Cosmic Acceleration in VCDM Cosmology
• Kinematic Probes of Type-II MMG: Padé Cosmographic Analysis of VCDM