Improved Cosmological Constraints from New, Old, and Combined Supernova Data Sets

Kowalski, M.; Rubin, D.; Aldering, G.; Agostinho, Rui; Amadon, Alexis; Amanullah, R.; Balland, C.; Barbary, Kyle; Blanc, G.; Challis, Peter; Conley, A.; Connolly, N.; Covarrubias, R.; Dawson, Kyle; Deustua, Susana E.; Ellis, Richard S.; Fabbro, S.; Fadeyev, V.; Fan, Xiaohui; Farris, Brian D.; Folatelli, G.; Frye, Brenda; Garavini, G.; Gates, E. L.; Goldhaber, G.; Goldman, B.; Goobar, A.; Groom, D. E.; Haïssinski, J.; Hardin, D.; Hook, I. M.; Kent, Stephen M.; Kim, A. G.; Knop, R. A.; Lidman, C.; Linder, Eric V.; Méndez, J.; Meyers, J.; Miller, G. Edward; Moniez, M.; Mourão, A.; Newberg, Heidi Jo; Nobili, S.; Nugent, P.; Pain, R.; Perdereau, O.; Perlmutter, S.; Phillips, M. M.; Prasad, Vinod; Quimby, R.; Regnault, Nicolas; Rich, Jeffrey A.; Rubenstein, Eric; Ruiz‐Lapuente, P.; Santos, F.D.; Schaefer, Bradley E.; Schommer, R. A.; Smith, R. C.; Söderberg, A. M.; Spadafora, A. L.; Strolger, Louis-Gregory; Strovink, M.; Suntzeff, Nicholas B.; Suzuki, N.; Thomas, R. C.; Walton, N. A.; Wang, L.; Wood‐Vasey, W. M.; Yun, J. L.

doi:10.1086/589937

Cited by 1,362 publications

(1,422 citation statements)

References 82 publications

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“…Grey dust has been invoked as an alternative explanation of the observed dimming of Type Ia Supernovae [12], but it is now understood that it cannot fit high redshift data (like for example the Union sample [13]) by itself, i.e. without some contribution from a cosmological constant-like fluid [14].…”

Section: Photon Dimming/absorption and Axion-photon Couplingsmentioning

confidence: 99%

Constraints on the CMB temperature-redshift dependence from SZ and distance measurements

Avgoustidis

Luzzi

Martins

et al. 2012

J. Cosmol. Astropart. Phys.

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Abstract. The relation between redshift and the CMB temperature, T CMB (z) = T 0 (1 + z) is a key prediction of standard cosmology, but is violated in many nonstandard models. Constraining possible deviations to this law is an effective way to test the ΛCDM paradigm and search for hints of new physics. We present state-ofthe-art constraints, using both direct and indirect measurements. In particular, we point out that in models where photons can be created or destroyed, not only does the temperature-redshift relation change, but so does the distance duality relation, and these departures from the standard behaviour are related, providing us with an opportunity to improve constraints. We show that current datasets limit possible deviations of the form T CMB (z) = T 0 (1 + z) 1−β to be β = 0.004 ± 0.016 up to a redshift z ∼ 3. We also discuss how, with the next generation of space and ground-based experiments, these constraints can be improved by more than one order of magnitude.

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Section: Photon Dimming/absorption and Axion-photon Couplingsmentioning

confidence: 99%

Constraints on the CMB temperature-redshift dependence from SZ and distance measurements

Avgoustidis

Luzzi

Martins

et al. 2012

J. Cosmol. Astropart. Phys.

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“…The accelerated expansion of our Universe is confirmed by many separated cosmological experiments [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. This expansion can be explained in GR by taking into account the dark energy component in the total energy of our Universe.…”

Section: Introductionmentioning

confidence: 53%

Analytic rotating black-hole solutions in N-dimensional f(T) gravity

Nashed

Hanafy

2017

Eur. Phys. J. C

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A non-diagonal vielbein ansatz is applied to the N -dimension field equations of f (T ) gravity. An analytical vacuum solution is derived for the quadratic polynomial f (T ) = T + T 2 and an inverse relation between the coupling constant and the cosmological constant . Since the induced metric has off-diagonal components, it cannot be removed by a mere coordinate transformation, the solution has a rotating parameter. The curvature and torsion scalars invariants are calculated to study the singularities and horizons of the solution. In contrast to general relativity, the Cauchy horizon differs from the horizon which shows the effect of the higher order torsion. The general expression of the energy-momentum vector of f (T ) gravity is used to calculate the energy of the system. Finally, we have shown that this kind of solution satisfies the first law of thermodynamics in the framework of f (T ) gravitational theories.

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“…Secondly, another issue at present in determining the growth rate is whether or not to use the two point correlation function instead of its Fourier transform, the power spectrum. Previous measurements of the correlation function in redshift space (Guzzo et al, 2008) The UNION supernovae compilation (Kowalski et al, 2008) consists of 307 low redshift SN all processed using the SALT light curve fitter (Guy et al, 2005). This compilation includes older data sets from the Supernova Legacy Survey and ESSENCE Survey as well as a recent dataset observed with HST.…”

Section: Discussionmentioning

confidence: 99%

“…The three probes discussed here, SNe, CMB and BAO, are complementary and constrain different regions of parameter space (see Fig 1.4 Kowalski et al, 2008). Individual datasets are affected by different parameter degeneracies.…”

Section: The Accelerating Expansion Of the Universementioning

confidence: 91%

“…The method suggested in Komatsu et al (2009) employs three distance priors from measurements of the CMB together with the 'UNION' supernova samples (Kowalski et al, 2008) and the baryon acoustic oscillations (BAO) in the distribution of galaxies (Percival et al, 2007) to explore the best fit parameters for the dynamical dark energy models.…”

Section: Appendix a A1 Wmap Distance Priorsmentioning

confidence: 99%

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Simulations of Dark Energy Cosmologies

Jennings

2012

Springer Theses

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source• a link is made to the metadata record in Durham E-Theses• the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders. No part of this thesis has been submitted elsewhere for any other degree or qualification.The work of others has been duly acknowledged.The copyright of this thesis rests with the author. No quotations from it should be published without the author's prior written consent and information derived from it should be acknowledged. AbstractFuture galaxy redshift surveys will make high precision measurements of the cosmic expansion history and the growth of structure which will potentially allow us to distinguish between different scenarios for the accelerating expansion of the Universe. In this thesis we study the nonlinear growth of cosmic structure in different dark energy models, using ultra-large volume N-body simulations. We measure key observables such as the growth of large scale structure, the halo mass function and baryonic acoustic oscillations.We study the power spectrum in redshift space in ΛCDM and quintessence dark energy models and test predictions for the form of the redshift space distortions. An improved model for the redshift space power spectrum, including the non-linear velocity divergence power spectrum, is presented. We have found a density-velocity relation which is cosmology independent and which relates the non-linear velocity divergence spectrum to the non-linear matter power spectrum. We provide a formula which generates the non-linear velocity divergence P(k) at any redshift, using only the non-linear matter power spectrum and the linear growth factor at the desired redshift. We also demonstrate for the first time that competing cosmological models with identical expansion histories -one with a scalar field and the other with a time-dependent change to Newton's gravitational constant -can indeed be distinguished by a measurement of the rate at which structures grow.Our calculations show that linear theory models for the power spectrum in redshift space fail to recover the correct growth rate on surprisingly large scales, leading to catastrophic systematic errors. Improved theoretical models, which have been calibrated against simulations, are needed to exploit the exquisitely accurate clustering measurements expected from future surveys.

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Improved Cosmological Constraints from New, Old, and Combined Supernova Data Sets

Cited by 1,362 publications

References 82 publications

Constraints on the CMB temperature-redshift dependence from SZ and distance measurements

Constraints on the CMB temperature-redshift dependence from SZ and distance measurements

Analytic rotating black-hole solutions in N-dimensional f(T) gravity

Simulations of Dark Energy Cosmologies

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