Distance probes of dark energy

Kim, A. G.; Padmanabhan, Nikhil; Aldering, G.; Allen, S. W.; Baltay, C.; Cahn, R. N.; D’Andrea, C. B.; Dalal, Neal; Dawson, Kyle; Denney, K. D.; Eisenstein, Daniel J.; Finley, D. A.; Freedman, Wendy L.; Ho, Shirley; Holz, D. E.; Kasen, Daniel; Kent, Stephen M.; Kessler, R.; Kuhlmann, S.; Linder, Eric V.; Martini, Paul; Nugent, P.; Perlmutter, S.; Peterson, B. M.; Riess, Adam G.; Rubin, D.; Šako, M.; Suntzeff, Nicholas B.; Suzuki, N.; Thomas, R. C.; Wood‐Vasey, W. M.; Woosley, S. E.

doi:10.1016/j.astropartphys.2014.05.007

Cited by 13 publications

(8 citation statements)

References 193 publications

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“…forthcoming spectroscopic galaxy surveys [101][102][103], and a Stage-IV CMB experiment [102,104] at the vanguard -to name just a few. Impressive advances in determinations of N eff , Y P , [D/H], and other cosmological observables are on the horizon.…”

Section: Discussionmentioning

confidence: 99%

Neutrino flavor transformation in the lepton-asymmetric universe

et al. 2016

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We investigate neutrino flavor transformation in the early universe in the presence of a lepton asymmetry, focusing on a two-flavor system with 1 - 3 mixing parameters. We identify five distinct regimes that emerge in an approximate treatment neglecting collisions as the initial lepton asymmetry at high temperature is varied from values comparable to current constraints on the lepton number down to values at which the neutrino-neutrino forward-scattering potential is negligible. The characteristic phenomena occurring in these regimes are (1) large synchronized oscillations, (2) minimal flavor transformation, (3) asymmetric (neutrino- or antineutrino-only) MSW, (4) partial MSW, and (5) symmetric MSW. We examine our numerical results in the framework of adiabaticity, and we illustrate how they are modified by collisional damping. Finally, we point out the existence of matter-neutrino resonances in the early universe and show that they suffer from non-adiabaticity.Comment: 18 pages, 15 figure

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Section: Discussionmentioning

confidence: 99%

Neutrino flavor transformation in the lepton-asymmetric universe

et al. 2016

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“…Predictions from numerical models are now critical to almost every aspect of precision studies of dark matter and dark energy, due to the intrinsic non-linearity of the gravitational evolution of matter in the Universe. Current and upcoming optical surveys that probe baryon acoustic oscillations (BAO), the galaxy power spectrum, weak gravitational lensing, and the abundances of galaxy clusters all require support from numerical simulations to guide observational campaigns and interpret their results (Hu and White 1996;Eisenstein et al 2005;Kim et al 2013;Weinberg et al 2013;Anderson et al 2014;Munshi et al 2008;Huterer et al 2013). Surveys in the X-ray and sub-millimeter wavelengths provide an alternate view of the high-temperature plasma that sits in the deep gravitational potential wells of the dark matter, and provide an alternate constraint on the abundances of the most massive collapsed objects in the Universe (Planck Collaboration et al 2013b;Mantz et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Dark Sky Simulations: Early Data Release

Skillman,

Warren,

Turk

et al. 2014

Preprint

108

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The Dark Sky Simulations are an ongoing series of cosmological N-body simulations designed to provide a quantitative and accessible model of the evolution of the large-scale Universe. Such models are essential for many aspects of the study of dark matter and dark energy, since we lack a sufficiently accurate analytic model of non-linear gravitational clustering. In July 2014, we made available to the general community our early data release, consisting of over 55 Terabytes of simulation data products, including our largest simulation to date, which used 1.07 × 10 12 (10240 3 ) particles in a volume 8h −1 Gpc across. Our simulations were performed with 2HOT, a purely tree-based adaptive Nbody method, running on 200,000 processors of the Titan supercomputer, with data analysis enabled by yt. We provide an overview of the derived halo catalogs, mass function, power spectra and light cone data. We show self-consistency in the mass function and mass power spectrum at the 1% level over a range of more than 1000 in particle mass. We also present a novel method to distribute and access very large datasets, based on an abstraction of the World Wide Web (WWW) as a file system, remote memory-mapped file access semantics, and a space-filling curve index. This method has been implemented for our data release, and provides a means to not only query stored results such as halo catalogs, but also to design and deploy new analysis techniques on large distributed datasets.

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“…The results based on the joint analysis of H(z)/SNIa data are given in Figs. (4)(5) and listed in the second panel of Table II. It becomes clear that the addition of the SNIa data in the likelihood analysis improves substantially the statistical results.…”

Section: A Joint Analysis With Sn Iamentioning

confidence: 99%

“…One of the fundamental questions of modern cosmology that subsequently emerges is what is the model that best describes the accelerated expansion of the universe, [3]. A prominent path in order to distinguish the various cosmological models is to probe the cosmic history [4] of the universe, using either the luminosity distance of standard candles or the angular diameter distance of standard rulers.…”

Section: Introductionmentioning

confidence: 99%

Constraining the dark energy models with H(z) data: An approach independent of H0

Anagnostopoulos

Basilakos

2018

Phys. Rev. D

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We study the performance of the latest H(z) data in constraining the cosmological parameters of different cosmological models, including that of Chevalier-Polarski-Linder w0w1 parametrization. First, we introduce a statistical procedure in which the chi-square estimator is not affected by the value of the Hubble constant. As a result, we find that the H(z) data do not rule out the possibility of either non-flat models or dynamical dark energy cosmological models. However, we verify that the time varying equation-of-state parameter w(z) is not constrained by the current expansion data. Combining the H(z) and the Type Ia supernova data we find that the H(z)/SNIa overall statistical analysis provides a substantial improvement of the cosmological constraints with respect to those of the H(z) analysis. Moreover, the w0 − w1 parameter space provided by the H(z)/SNIa joint analysis is in a very good agreement with that of Planck 2015, which confirms that the present analysis with the H(z) and SNIa probes correctly reveals the expansion of the Universe as found by the team of Planck. Finally, we generate sets of Monte Carlo realizations in order to quantify the ability of the H(z) data to provide strong constraints on the dark energy model parameters. The Monte Carlo approach shows significant improvement of the constraints, when increasing the sample to 100 H(z) measurements. Such a goal can be achieved in the future, especially in the light of the next generation of surveys. PACS numbers: 95.36.+x, 04.50.Kd, 98.80.Es

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Distance probes of dark energy

Cited by 13 publications

References 193 publications

Neutrino flavor transformation in the lepton-asymmetric universe

Neutrino flavor transformation in the lepton-asymmetric universe

Dark Sky Simulations: Early Data Release

Constraining the dark energy models with H(z) data: An approach independent of H0

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