Four new observational<i>H</i>(<i>z</i>) data from luminous red galaxies in the Sloan Digital Sky Survey data release seven

Cong, Zixiang; Zhang, Han; Yuan, Shuo; Liu, Siqi; Zhang, Tong-Jie; Sun, Yexiang

doi:10.1088/1674-4527/14/10/002

Cited by 691 publications

(370 citation statements)

References 42 publications

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“…However, at low redshifts, the shape of H(z) determined from observational probes are almost independent on the exact cosmological model adopted. This is true since various models are fitting the data producing local H(z) values which are consistent with H0 from ΛCDM cosmology within the measurement uncertainties (e.g., Carvalho et al 2008;Zhang et al 2014;Farooq et al 2017). For the redshifts studied in this paper, i.e.…”

Section: Cosmological Frameworkmentioning

confidence: 66%

“…In the rest of this section we adopt a value of the present day Hubble parameter of H0 = 75 kms −1 Mpc −1 , consistent with local Universe measurements (e.g., Riess et al 1998;Komatsu et al 2011;Percival et al 2010;Jimenez et al 2003;Zhang et al 2014). It is the same used for all the results based on DM models, and is consistent with a0 adopted for the MOND models.…”

Section: Imf Freementioning

confidence: 71%

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Testing Verlinde's emergent gravity in early-type galaxies

Tortora

Koopmans

Napolitano

et al. 2017

Monthly Notices of the Royal Astronomical Society

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Verlinde derived gravity as an emergent force from the information flow, through two-dimensional surfaces and recently, by a priori postulating the entanglement of information in three-dimensional space, he derived the effect of the gravitational potential from dark matter (DM) as the entropy displacement of dark energy by baryonic matter. In Emergent Gravity (EG) this apparent DM depends only on the baryonic mass distribution and the present-day value of the Hubble parameter. In this paper we test the EG proposition, formalized by Verlinde for a spherical and isolated mass distribution, using the central dynamics (SDSS velocity dispersion, σ) and the K-band light distribution in a sample of 4260 massive (M > ∼ 10 10 M ) and local early-type galaxies (ETGs) from the SPIDER datasample. Our results remain unaltered if we consider the sample of 807 roundest field galaxies. Using these observations we derive the predictions by EG for the stellar mass-to-light ratio (M/L) and the Initial Mass Function (IMF), and compare them with the same inferences derived from a) the standard DM-based models, b) an alternative description of the missing mass (i.e. MOND) and c) stellar population models. We demonstrate that, consistently with a classical Newtonian framework with a DM halo component, or alternative theories of gravity as MOND, the central dynamics can be fitted if the IMF is assumed non-universal. The results can be interpreted with a IMF lighter than a standard Chabrier at low-σ, and bottom-heavier IMFs at larger σ. We find lower, but still acceptable, stellar M/L in EG theory, if compared with the DM-based NFW model and with MOND. The results from EG are comparable to what is found if the DM haloes are adiabatically contracted and also with expectations from spectral gravity-sensitive features. If the strain caused by the entropy displacement would be not maximal, as adopted in the current formulation, then the dynamics of ETGs could be reproduced with larger M/L.

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Section: Cosmological Frameworkmentioning

confidence: 66%

Section: Imf Freementioning

confidence: 71%

Testing Verlinde's emergent gravity in early-type galaxies

Tortora

Koopmans

Napolitano

et al. 2017

Monthly Notices of the Royal Astronomical Society

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“…Thus, we use 28 independent H(z) measurements [18,19,20,21,22,23,24] in the redshift range 0 < z < 1.75.…”

Section: Distances From H(z) Measurementsmentioning

confidence: 99%

Two new tests to the distance duality relation with galaxy clusters

Costa

Busti

Holanda

2015

J. Cosmol. Astropart. Phys.

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The cosmic distance duality relation is a milestone of cosmology involving the luminosity and angular diameter distances. Any departure of the relation points to new physics or systematic errors in the observations, therefore tests of the relation are extremely important to build a consistent cosmological framework. Here, two new tests are proposed based on galaxy clusters observations (angular diameter distance and gas mass fraction) and H(z) measurements. By applying Gaussian Processes, a non-parametric method, we are able to derive constraints on departures of the relation where no evidence of deviation is found in both methods, reinforcing the cosmological and astrophysical hypotheses adopted so far.

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“…[27]. In this work, we adopt 19 H(z) data points obtained from the DA method in [38][39][40][41] (see also [42]), which we show in Table I. We have excluded 4 data points that have large differences in redshift (∆z > 0.005) from the nearest observed SNe Ia.…”

Section: B Hubble Parameter Datamentioning

confidence: 99%

Is the Universe transparent?

Liao

Avgoustidis

2015

Phys. Rev. D

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We present our study on cosmic opacity, which relates to changes in photon number as photons travel from the source to the observer. Cosmic opacity may be caused by absorption/scattering due to matter in the universe, or by extragalactic magnetic fields that can turn photons into unobserved particles (e.g. light axions, chameleons, gravitons, Kaluza-Klein modes), and it is crucial to correctly interpret astronomical photometric measurements like type Ia supernovae observations. On the other hand, the expansion rate at different epochs, i.e. the observational Hubble parameter data H(z), are obtained from differential ageing of passively evolving galaxies or from baryon acoustic oscillations and thus are not affected by cosmic opacity. In this work, we first construct opacity-free luminosity distances from H(z) determinations, taking correlations between different redshifts into consideration for our error analysis. Moreover, we let the light-curve fitting parameters, accounting for distance estimation in type Ia supernovae observations, free to ensure that our analysis is authentically cosmological-model-independent and gives a robust result. Any non-zero residuals between these two kinds of luminosity distances can be deemed as an indication of the existence of cosmic opacity. While a transparent universe is currently consistent with the data, our results show that strong constraints on opacity (and consequently on physical mechanisms that could cause it) can be obtained in a cosmological-model-independent fashion.PACS numbers: 98.80.-k, 98.80.Es

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Four new observationalH(z) data from luminous red galaxies in the Sloan Digital Sky Survey data release seven

Cited by 691 publications

References 42 publications

Testing Verlinde's emergent gravity in early-type galaxies

Testing Verlinde's emergent gravity in early-type galaxies

Two new tests to the distance duality relation with galaxy clusters

Is the Universe transparent?

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