Observational constraints on phantom-like braneworld cosmologies

Ruth Lazkoz; Roy Maartens; Elisabetta Majerotto

doi:10.1088/1742-6596/66/1/012057

Observational constraints on phantom-like braneworld cosmologies

Ruth Lazkoz^*, Roy Maartens, Elisabetta Majerotto

^*Corresponding author for this work

Institute of Cosmology & Gravitation

University of the Basque Country

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

We study a simple braneworld model in which the universe is filled solely with cold dark matter and a cosmological constant, although the effective dark energy is phantom-like due extra-dimensional gravity effects. Theoretically the cosmological constant Λ is screened by modified gravity, so that a larger Λ can be accommodated, but actually observations do not seem to favour any screening significantly. Using supernova data, the cosmic microwave background shift parameter, and the baryon oscillation peak in the galaxy distribution we set constrains to the model. We find the mean value of Ω_m with 68% confidence limits, and an upper limit on Ω_Λ at the 68% confidence level. We conclude the best-fit model is very close to a standard LCDM model, but the LCDM model represents a better fit since it has one less parameter.

Original language	English
Title of host publication	Journal of Physics: Conference Series
Subtitle of host publication	XXIXth Spanish Relativity Meeting (ERE 2006): Einstein's Legacy: From the Theoretical Physics Paradise to Astrophysical Observations, 4-8 September 2006, Palma de Mallorca, Spain
Volume	66
Edition	1
DOIs	https://doi.org/10.1088/1742-6596/66/1/012057
Publication status	Published - 1 May 2007
Event	XXIXth Spanish Relativity Meeting: Einstein's Legacy: From the Theoretical Paradise to Astrophysical Observations - Palma, Spain Duration: 4 Sept 2006 → 8 Sept 2006 Conference number: 29th

Publication series

Name	Journal of Physics: Conference Series
Publisher	IOP Publishing
ISSN (Print)	1742-6588

Conference

Conference	XXIXth Spanish Relativity Meeting
Abbreviated title	ERE 2006
Country/Territory	Spain
City	Palma
Period	4/09/06 → 8/09/06

Access to Document

10.1088/1742-6596/66/1/012057

Cite this

Lazkoz, R., Maartens, R., & Majerotto, E. (2007). Observational constraints on phantom-like braneworld cosmologies. In Journal of Physics: Conference Series: XXIXth Spanish Relativity Meeting (ERE 2006): Einstein's Legacy: From the Theoretical Physics Paradise to Astrophysical Observations, 4-8 September 2006, Palma de Mallorca, Spain (1 ed., Vol. 66). (Journal of Physics: Conference Series). https://doi.org/10.1088/1742-6596/66/1/012057

Lazkoz, Ruth ; Maartens, Roy ; Majerotto, Elisabetta. / Observational constraints on phantom-like braneworld cosmologies. Journal of Physics: Conference Series: XXIXth Spanish Relativity Meeting (ERE 2006): Einstein's Legacy: From the Theoretical Physics Paradise to Astrophysical Observations, 4-8 September 2006, Palma de Mallorca, Spain. Vol. 66 1. ed. 2007. (Journal of Physics: Conference Series).

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title = "Observational constraints on phantom-like braneworld cosmologies",

abstract = "We study a simple braneworld model in which the universe is filled solely with cold dark matter and a cosmological constant, although the effective dark energy is phantom-like due extra-dimensional gravity effects. Theoretically the cosmological constant Λ is screened by modified gravity, so that a larger Λ can be accommodated, but actually observations do not seem to favour any screening significantly. Using supernova data, the cosmic microwave background shift parameter, and the baryon oscillation peak in the galaxy distribution we set constrains to the model. We find the mean value of Ωm with 68% confidence limits, and an upper limit on ΩΛ at the 68% confidence level. We conclude the best-fit model is very close to a standard LCDM model, but the LCDM model represents a better fit since it has one less parameter.",

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Lazkoz, R, Maartens, R & Majerotto, E 2007, Observational constraints on phantom-like braneworld cosmologies. in Journal of Physics: Conference Series: XXIXth Spanish Relativity Meeting (ERE 2006): Einstein's Legacy: From the Theoretical Physics Paradise to Astrophysical Observations, 4-8 September 2006, Palma de Mallorca, Spain. 1 edn, vol. 66, Journal of Physics: Conference Series, XXIXth Spanish Relativity Meeting, Palma, Spain, 4/09/06. https://doi.org/10.1088/1742-6596/66/1/012057

Observational constraints on phantom-like braneworld cosmologies. / Lazkoz, Ruth; Maartens, Roy; Majerotto, Elisabetta.
Journal of Physics: Conference Series: XXIXth Spanish Relativity Meeting (ERE 2006): Einstein's Legacy: From the Theoretical Physics Paradise to Astrophysical Observations, 4-8 September 2006, Palma de Mallorca, Spain. Vol. 66 1. ed. 2007. (Journal of Physics: Conference Series).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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AB - We study a simple braneworld model in which the universe is filled solely with cold dark matter and a cosmological constant, although the effective dark energy is phantom-like due extra-dimensional gravity effects. Theoretically the cosmological constant Λ is screened by modified gravity, so that a larger Λ can be accommodated, but actually observations do not seem to favour any screening significantly. Using supernova data, the cosmic microwave background shift parameter, and the baryon oscillation peak in the galaxy distribution we set constrains to the model. We find the mean value of Ωm with 68% confidence limits, and an upper limit on ΩΛ at the 68% confidence level. We conclude the best-fit model is very close to a standard LCDM model, but the LCDM model represents a better fit since it has one less parameter.

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Lazkoz R, Maartens R, Majerotto E. Observational constraints on phantom-like braneworld cosmologies. In Journal of Physics: Conference Series: XXIXth Spanish Relativity Meeting (ERE 2006): Einstein's Legacy: From the Theoretical Physics Paradise to Astrophysical Observations, 4-8 September 2006, Palma de Mallorca, Spain. 1 ed. Vol. 66. 2007. (Journal of Physics: Conference Series). doi: 10.1088/1742-6596/66/1/012057

Observational constraints on phantom-like braneworld cosmologies

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