Isocurvature modes and Baryon Acoustic Oscillations

Mangilli, Anna; Verde, Licia; Beltran, Maria

doi:10.1088/1475-7516/2010/10/009

Title: Isocurvature modes and Baryon Acoustic Oscillations

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Abstract

The measurement of Baryonic Acoustic Oscillations from galaxy surveys is well known to be a robust and powerful tool to constrain dark energy. This method relies on the knowledge of the size of the acoustic horizon at radiation drag derived from Cosmic Microwave Background Anisotropy measurements. In this paper we quantify the effect of non-standard initial conditions in the form of an isocurvature component on the determination of dark energy parameters from future BAO surveys. In particular, if there is an isocurvature component (at a level still allowed by present data) but it is ignored in the CMB analysis, the sound horizon and cosmological parameters determination is biased, and, as a consequence, future surveys may incorrectly suggest deviations from a cosmological constant. In order to recover an unbiased determination of the sound horizon and dark energy parameters, a component of isocurvature perturbations must be included in the model when analyzing CMB data. Fortunately, doing so does not increase parameter errors significantly.

Authors:

Mangilli, Anna; Verde, Licia ^[1]; Beltran, Maria ^[2]

ICC-UB (Instituto de Ciencias del Cosmos at Universitad de Barcelona), Marti i Franques 1, Barcelona (Spain)
Department of Astronomy and Astrophysics, The University of Chicago, 5640 S Ellis, Chicago IL 60637 (United States)

Publication Date:: Fri Oct 01 00:00:00 EDT 2010

OSTI Identifier:: 22275342

Resource Type:: Journal Article

Journal Name:: Journal of Cosmology and Astroparticle Physics

Additional Journal Information:: Journal Volume: 2010; Journal Issue: 10; 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; ANISOTROPY; BARYONS; COSMOLOGICAL CONSTANT; COSMOLOGICAL MODELS; COSMOLOGY; DISTURBANCES; GALAXIES; NONLUMINOUS MATTER; OSCILLATIONS; RELICT RADIATION; SOUND WAVES

Citation Formats


                    Mangilli, Anna, Verde, Licia, and Beltran, Maria. Isocurvature modes and Baryon Acoustic Oscillations.  United States: N. p., 2010. 
        Web.  doi:10.1088/1475-7516/2010/10/009.

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                    Mangilli, Anna, Verde, Licia, & Beltran, Maria. Isocurvature modes and Baryon Acoustic Oscillations.  United States.  https://doi.org/10.1088/1475-7516/2010/10/009

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                    Mangilli, Anna, Verde, Licia, and Beltran, Maria. 2010.  
        "Isocurvature modes and Baryon Acoustic Oscillations".  United States.  https://doi.org/10.1088/1475-7516/2010/10/009.

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@article{osti_22275342,

  title        = {Isocurvature modes and Baryon Acoustic Oscillations},

  author       = {Mangilli, Anna and Verde, Licia and Beltran, Maria},

  abstractNote = {The measurement of Baryonic Acoustic Oscillations from galaxy surveys is well known to be a robust and powerful tool to constrain dark energy. This method relies on the knowledge of the size of the acoustic horizon at radiation drag derived from Cosmic Microwave Background Anisotropy measurements. In this paper we quantify the effect of non-standard initial conditions in the form of an isocurvature component on the determination of dark energy parameters from future BAO surveys. In particular, if there is an isocurvature component (at a level still allowed by present data) but it is ignored in the CMB analysis, the sound horizon and cosmological parameters determination is biased, and, as a consequence, future surveys may incorrectly suggest deviations from a cosmological constant. In order to recover an unbiased determination of the sound horizon and dark energy parameters, a component of isocurvature perturbations must be included in the model when analyzing CMB data. Fortunately, doing so does not increase parameter errors significantly.},

  doi          = {10.1088/1475-7516/2010/10/009},

  url          = {https://www.osti.gov/biblio/22275342},
  journal      = {Journal of Cosmology and Astroparticle Physics},

  issn         = {1475-7516},

  number       = 10,

  volume       = 2010,

  place        = {United States},

  year         = {Fri Oct 01 00:00:00 EDT 2010},

  month        = {Fri Oct 01 00:00:00 EDT 2010}

}

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