Finite time pseudo-rip singularity in cosmology

Abstract

By studying first a new decelerating sudden future singularity (SFS) universe we report finding a novel type of cosmological singularity which we dub a finite time pseudo-rip (FTPR) because unlike for a pseudo-rip, it happens in the finite future of the universe. In contrast to the new SFS model, where the expansion is decelerating before reaching the pressure singularity, the FTPR scenario is preceded by a super-accelerated phantom phase. Our claim is based on the thorough study of the energy conditions showing the violations of all of them for a FTPR, and only the dominant energy one for an SFS. Application of the so-called Raychaudhuri averaging shows that, alike within the requirement of geodesic completeness, these singularities are weak in the sense of this definition. We study the properties of the models including the behaviour of the cosmological horizons presented in the appropriate Penrose diagrams. Finally, we introduce a FTPR model containing standard radiation and dust fluids that can mimic the past expansion history of $\Lambda$CDM though facing a future pressure singularity.

REVTEX4-2, 12 pages, 7 figures, strongly revised version, new section added, matches PLB published paper

References in corpus (28)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• A Phantom Menace? Cosmological consequences of a dark energy component with super-negative equation of state
• Phantom Energy and Cosmic Doomsday
• In the Realm of the Hubble tension $-$ a Review of Solutions
• The Ekpyrotic Universe: Colliding Branes and the Origin of the Hot Big Bang
• Properties of singularities in (phantom) dark energy universe
• Challenges for $\Lambda$CDM: An update
• Cosmic Evolution in a Cyclic Universe
• From Big Crunch to Big Bang
• Beyond $\Lambda$CDM: Problems, solutions, and the road ahead
• Sudden Future Singularities
• Tachyons, Scalar Fields and Cosmology
• Phantom cosmologies
• The Little Rip
• More General Sudden Singularities
• Geodesic behavior of sudden future singularities
• Worse than a big rip?
• Pseudo-rip: Cosmological models intermediate between the cosmological constant and the little rip
• On the generalised Chaplygin gas: worse than a big rip or quieter than a sudden singularity?
• The little sibling of the big rip singularity
• How far is it to a sudden future singularity of pressure?
• The Apparent (Gravitational) Horizon in Cosmology
• Tachyon cosmology, supernovae data and the Big Brake singularity
• Will the tachyonic Universe survive the Big Brake?
• Spacetime averaging of exotic singularity universes
• Non-exotic conformal structure of weak exotic singularities
• Little Rip, Pseudo Rip and bounce cosmology with generalized equation of state in non-standard backgrounds