An Improved Method to Test the Distance-Duality Relation

Yang, Xi; Yu, Hao-Ran; Zhang, Zhisong; Zhang, Tong-Jie

doi:10.1088/2041-8205/777/2/l24

Cited by 52 publications

(51 citation statements)

References 23 publications

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“…that is produced by the compression. The parameter M in Equation (4) is degenerate with H 0 as discussed in M16 (see also Yang et al 2013), and it is possible to eliminate M and to obtain d L that is directly comparable to d A . We exploit the fact that at the lowest available, or the "anchoring" redshift z 1 = 0.01, the luminosity distance can be approximated to the second order as…”

Section: Snia Luminosity Distancementioning

confidence: 99%

“…However, angular distance measurements from galaxy cluster observations are cosmological-model dependent (see, e.g., Bonamente et al 2006). Furthermore, astrophysical uncertainties such as the three-dimensional profile of intra-cluster plasma may significantly affect the estimation of d A (Meng et al 2012;Yang et al 2013). Recent works have instead used angulardiameter distance measurements from observations of strong lens systems (Holanda et al 2016Liao et al 2016;Fu & Li 2017;Rana et al 2017).…”

Section: Introductionmentioning

confidence: 99%

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Statistical Test of Distance–Duality Relation with Type Ia Supernovae and Baryon Acoustic Oscillations

Corasaniti

2018

ApJ

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We test the distance-duality relation η ≡ d L /[(1 + z) 2 d A ] = 1 between cosmological luminosity distance (d L ) from the JLA SNe Ia compilation and angular-diameter distance (d A ) based on Baryon Oscillation Spectroscopic Survey (BOSS) and WiggleZ baryon acoustic oscillation measurements. The d L measurements are matched to d A redshift by a statistically consistent compression procedure. With Monte Carlo methods, nontrivial and correlated distributions of η can be explored in a straightforward manner without resorting to a particular evolution template η(z). Assuming independent constraints on cosmological parameters that are necessary to obtain d L and d A values, we find 9% constraints consistent with η = 1 from the analysis of SNIa + BOSS and an 18% bound results from SNIa + WiggleZ. These results are contrary to previous claims that η < 1 has been found close to or above the 1σ level. We discuss the effect of different cosmological parameter inputs and the use of the apparent deviation from distance-duality as a proxy of systematic effects on cosmic distance measurements. The results suggest possible systematic overestimation of SNIa luminosity distances compared with d A data when a Planck ΛCDM cosmological parameter inference is used to enhance the precision. If interpreted as an extinction correction due to a gray dust component, the effect is broadly consistent with independent observational constraints.

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Section: Snia Luminosity Distancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Statistical Test of Distance–Duality Relation with Type Ia Supernovae and Baryon Acoustic Oscillations

Corasaniti

2018

ApJ

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“…In principle, modifying the temperature definition with the parametrization (26) implies a different use of cosmic distances. This is intimately related to the duality problem [37,38] between the luminosity and angular distances. In this work, we assume that δ ∼ 0 and may be parameterized by δ = β − 1, with β 1.…”

Section: The Volume and Its Evolution In Terms Of The Redshiftmentioning

confidence: 97%

Cosmographic Thermodynamics of Dark Energy

Luongo

2017

Entropy

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Dark energy's thermodynamics is here revised giving particular attention to the role played by specific heats and entropy in a flat Friedmann-Robertson-Walker universe. Under the hypothesis of adiabatic heat exchanges, we rewrite the specific heats through cosmographic, model-independent quantities and we trace their evolutions in terms of z. We demonstrate that dark energy may be modeled as perfect gas, only as the Mayer relation is preserved. In particular, we find that the Mayer relation holds if j − q > 1 2 . The former result turns out to be general so that, even at the transition time, the jerk parameter j cannot violate the condition: j tr > 1 2 . This outcome rules out those models which predict opposite cases, whereas it turns out to be compatible with the concordance paradigm. We thus compare our bounds with the ΛCDM model, highlighting that a constant dark energy term seems to be compatible with the so-obtained specific heat thermodynamics, after a precise redshift domain. In our treatment, we show the degeneracy between unified dark energy models with zero sound speed and the concordance paradigm. Under this scheme, we suggest that the cosmological constant may be viewed as an effective approach to dark energy either at small or high redshift domains. Last but not least, we discuss how to reconstruct dark energy's entropy from specific heats and we finally compute both entropy and specific heats into the luminosity distance d L , in order to fix constraints over them through cosmic data.

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“…It plays an essential role in cosmological observations and in the last years it has been tested by several authors in different cosmological context [39,40,41,42,43,44] (see Table I in [45] for recent results).…”

Section: Scalar-tensor Theories Coupled To Electromagnetic Sectormentioning

confidence: 99%

Improved constraints on violations of the Einstein equivalence principle in the electromagnetic sector with complementary cosmic probes

Holanda

Pereira

Busti

et al. 2017

Class. Quantum Grav.

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Recent results have shown that a field non-minimally coupled to the electromagnetic Lagrangian can induce a violation of the Einstein equivalence principle. This kind of coupling is present in a very wide class of gravitation theories. In a cosmological context, this would break the validity of the cosmic distance duality relation as well as cause a time variation of the fine structure constant. Here, we improve constraints on this scenario by using four different observables: the luminosity distance of type Ia supernovae, the angular diameter distance of galaxy clusters, the gas mass fraction of galaxy clusters and the temperature of the cosmic microwave background at different redshifts. We consider four standard parametrizations adopted in the literature and show that, due to a high complementarity of the data, the errors are shrunk between 20% and 40% depending on the parametrization. We also show that our constraints are weakly affected by the geometry considered to describe the galaxy clusters. In short, no violation of the Einstein equivalence principle is detected up to redshifts ∼ 3.

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An Improved Method to Test the Distance-Duality Relation

Cited by 52 publications

References 23 publications

Statistical Test of Distance–Duality Relation with Type Ia Supernovae and Baryon Acoustic Oscillations

Statistical Test of Distance–Duality Relation with Type Ia Supernovae and Baryon Acoustic Oscillations

Cosmographic Thermodynamics of Dark Energy

Improved constraints on violations of the Einstein equivalence principle in the electromagnetic sector with complementary cosmic probes

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