Challenges of the accelerating Universe: Measuring the expansion - - PowerPoint PPT Presentation

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Challenges of the accelerating Universe: Measuring the expansion - - PowerPoint PPT Presentation

May 25, 2023 279 likes •618 views

Challenges of the accelerating Universe: Measuring the expansion rate QuickTime and a TIFF (LZW) decompressor are needed to see this picture. Raul Jimenez www.ice.csic.es/personal/jimenez The basics Action describing the dynamics of the

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QuickTimeﾪ and a TIFF (LZW) decompressor are needed to see this picture.

Challenges of the accelerating Universe: Measuring the expansion rate

Raul Jimenez www.ice.csic.es/personal/jimenez

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The basics

Action describing the dynamics of the universe is: Consider quintessence a perfect fluid: Which has conservation law:

For full treatment see Simon, Verde, RJ (2005)

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with Dan Stern (JPL/Caltech) Marc Kamionkowski (Caltech) Licia Verde (Barcelona)

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“This method provides relative ages to a formal precision of 2-7%. We demonstrate that the calculated relative ages are independent of the choice of theoretical model.” (0812.4541)

A Lesson from the past: Globular Cluster RELATIVE AGES

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The edge for z<0.2 The value of H0 Reconstruct w(z): RELATIVE GALAXY AGES At z=0 dz/dt gives Ho and we have SDSS galaxies:

dt dz z z H ) 1 ( 1 ) ( + − =

Similar trend found by Bernardi et al. (astro-ph/0509360) using alpha-enhanced models

(Jimenez et al. 2003) (Jimenez et al. 2003)

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GDDS

+high z radiogalaxies + Treu et al. 2000 sample

From Simon, Verde, RJ (2005)

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Multiple uses of H(z)

A factor 5 improvement on universe transparency (Avgoustidis, Verde, RJ arXiv:0902.2006) Detection of aceleration/deceleration (Avgoustidis, Verde, RJ arXiv:0902.2006)

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Multiple uses of H(z)

Constraints on the mass and number of relativistic particles (de Bernardis et al. JCAP0803:020,2008 Figueroa, Verde, RJ JCAP0810:038,2008) and on the curvature

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The importance of having high S/N spectra

If you want to do radial BAOs you do need spectra Spectra of SN Ia hosts may help to tighten the H diagram

Aubourg et al. (2008) Roig et al. (2009)