Download Advanced Statistical Methods for Astrophysical Probes of by Marisa Cristina March PDF

By Marisa Cristina March

This thesis explores complicated Bayesian statistical equipment for extracting key details for cosmological version choice, parameter inference and forecasting from astrophysical observations. Bayesian version choice offers a degree of ways strong types in a suite are relative to one another - yet what if the simplest version is lacking and never integrated within the set? Bayesian Doubt is an strategy which addresses this challenge and seeks to carry an absolute instead of a relative degree of ways stable a version is. Supernovae variety Ia have been the 1st astrophysical observations to point the overdue time acceleration of the Universe - this paintings provides a close Bayesian Hierarchical version to deduce the cosmological parameters (in specific darkish power) from observations of those supernovae kind Ia.

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Void models are based on the idea of an inhomogeneous Universe, which is less dense at the centre (the underdense ‘void’ ) and more dense at the edges. Typically these void models are based on a spherically symmetric Lemaître-Tolman-Bondi (LTB) Universe [20, 21] with the observers placed close to the centre of the void, for a discussion of how void models produce the appearance of late time acceleration see for example [22]. One of the main criticisms of void models are that they violate the Copernican principle, however this criticism may be side stepped to some degree by constructing a model in which there are many voids and that the void in which the observers find themselves is no different to any of the other voids.

017 The inclusion of this constraint from the BAO data is discussed in Sect. 8 and the confidence intervals produced can be seen in Fig. 17. References 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. : 2008, Cosmology, Oxford University Press Peacock, J. : 1924, Zeitschrift fur Physik21, 326 Misner, C. , Thorne, K. , and Wheeler, J. H. Freeman and Co. Riess, A. , Filippenko, A. , Garnavich, P. , Gilliland, R. , Hogan, C. , Krishner, R. , Phillips, M. , Schmidt, B. , Schommer, R.

However, Eqs. 97) do accurately predict the location of the ‘acoustic peaks’ in the CMB angular power spectrum. 101) alm al∗m = δll δmm Cl The observed angular power spectrum for the CMB, as measured by WMAP [20] and ACBAR [21] is shown in Fig. 1). The ‘acoustic peaks’ due to the oscillations in the photon-baryon fluid can be clearly seen from l = 200 onwards—these same peaks show up as ‘baryonic wiggles’ in the matter power spectrum. The idea is to use the spacing of the peaks manifest in the CMB angular power spectrum and the galaxy power spectrum as a ‘standard ruler’ to probe the expansion history of the universe and constrain dark energy.

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