skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Future singularity avoidance in phantom dark energy models

Abstract

Different approaches to quantum cosmology are studied in order to deal with the future singularity avoidance problem. Our results show that these future singularities will persist but could take different forms. As an example we have studied the big rip which appear when one considers the state equation P = ωρ with ω < −1, showing that it does not disappear in modified gravity. On the other hand, it is well-known that quantum geometric effects (holonomy corrections) in loop quantum cosmology introduce a quadratic modification, namely proportional to ρ{sup 2}, in Friedmann's equation that replace the big rip by a non-singular bounce. However this modified Friedmann equation could have been obtained in an inconsistent way, what means that the obtained results from this equation, in particular singularity avoidance, would be incorrect. In fact, we will show that instead of a non-singular bounce, the big rip singularity would be replaced, in loop quantum cosmology, by other kind of singularity.

Authors:
 [1]
  1. Departament de Matemàtica Aplicada I, Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona (Spain)
Publication Date:
OSTI Identifier:
22280025
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2012; Journal Issue: 07; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; CORRECTIONS; FIELD EQUATIONS; GEOMETRY; GRAVITATION; NONLUMINOUS MATTER; PHANTOMS; QUANTUM COSMOLOGY; SINGULARITY

Citation Formats

Haro, Jaume de, E-mail: jaime.haro@upc.edu. Future singularity avoidance in phantom dark energy models. United States: N. p., 2012. Web. doi:10.1088/1475-7516/2012/07/007.
Haro, Jaume de, E-mail: jaime.haro@upc.edu. Future singularity avoidance in phantom dark energy models. United States. https://doi.org/10.1088/1475-7516/2012/07/007
Haro, Jaume de, E-mail: jaime.haro@upc.edu. 2012. "Future singularity avoidance in phantom dark energy models". United States. https://doi.org/10.1088/1475-7516/2012/07/007.
@article{osti_22280025,
title = {Future singularity avoidance in phantom dark energy models},
author = {Haro, Jaume de, E-mail: jaime.haro@upc.edu},
abstractNote = {Different approaches to quantum cosmology are studied in order to deal with the future singularity avoidance problem. Our results show that these future singularities will persist but could take different forms. As an example we have studied the big rip which appear when one considers the state equation P = ωρ with ω < −1, showing that it does not disappear in modified gravity. On the other hand, it is well-known that quantum geometric effects (holonomy corrections) in loop quantum cosmology introduce a quadratic modification, namely proportional to ρ{sup 2}, in Friedmann's equation that replace the big rip by a non-singular bounce. However this modified Friedmann equation could have been obtained in an inconsistent way, what means that the obtained results from this equation, in particular singularity avoidance, would be incorrect. In fact, we will show that instead of a non-singular bounce, the big rip singularity would be replaced, in loop quantum cosmology, by other kind of singularity.},
doi = {10.1088/1475-7516/2012/07/007},
url = {https://www.osti.gov/biblio/22280025}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 07,
volume = 2012,
place = {United States},
year = {Sun Jul 01 00:00:00 EDT 2012},
month = {Sun Jul 01 00:00:00 EDT 2012}
}