Type V singularities with inhomogeneous equations of state
arXiv:2209.07328 · doi:10.1016/j.physletb.2022.137494
Abstract
Interest in cosmological singularities has remarkably grown in recent times, particularly on future singularities with the discovery of late-time acceleration of the universe and dark energy. Recent work has seen a proper classification of such singularities into strong and weak based on their strength, with weak singularities being the likes of sudden, w and big freeze singularities and strong singularities like the big rip. This has led to a classification of such singularities in various types like Big rip is Type 1, w-singularity is type V etc. While singularities of type I-type IV have been discussed vividly by taking into account inhomogeneous equations of state (EOS), the same has not been attempted for type V singularities. So in this work we have discussed in detail about the formation of type V singularities in various cosmologies after considering inhomogeneous equations of state. We consider two inhomogeneous forms of the EOS in the context of four different cosmological backgrounds ; standard general relativistic cosmology, an asymptotically safe cosmology, a cosmology inspired by modified area-entropy relations, generalized uncertainty principles, holographic renormalization and Chern-Simons gravity( all of which can be coincidentally described by the same form of the modified Friedmann equation) and an f(R) gravity cosmology. We show in detail that one sees some very big differences in the occurence conditions of type V singularities when one makes such considerations. In the particular case of the f(R) gravity cosmology, we see that the type V singularities get completely removed. This work goes to show that the creation and formation of type V singularities is influenced most strongly by the form of the equation of state that one considers, way more so than what background cosmology one chooses.
v2 , 20 pages with some references added, matches the published version in PLB
References in corpus (19)
- Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
- Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests
- The future evolution and finite-time singularities in -gravity unifying the inflation and cosmic acceleration
- Corrected Entropy-Area Relation and Modified Friedmann Equations
- Modified cosmology from extended entropy with varying exponent
- Worse than a big rip?
- Tachyon dark energy models: dynamics and constraints
- Dynamics of interacting dark energy model in Einstein and Loop Quantum Cosmology
- Dynamics of interacting phantom scalar field dark energy in Loop Quantum Cosmology
- Slow-roll k-essence
- Generalised DBI-Quintessence
- -cosmological singularities
- Did the Universe Experienced a Pressure non-Crushing Type Cosmological Singularity in the Recent Past?
- Hidden past of dark energy cosmological models
- Tachyon cosmology, supernovae data and the Big Brake singularity
- Finite time future singularities in the interacting dark sector
- Inaccessible Singularities in Toral Cosmology
- Interacting Dark Side of Universe Through Generalized Uncertainty Principle
- Reconstruction of DBI-essence dark energy with f(R) gravity and its effect on black hole and wormhole mass accretion