A model-independent reconstruction of dark sector interactions

von Marttens, Rodrigo; Gonzalez, Javier E.; Alcaniz, Jailson; Marra, Valerio; Casarini, Luciano

doi:10.48550/arxiv.2011.10846

Cited by 6 publications

(6 citation statements)

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“…However, the choice of the coupling term in these interaction models is purely phenomenological for which a natural guidance from the fundamental physics does not exist, and therefore it could be worthwhile to investigate the dark sector interaction using some model-independent approach such as the Gaussian process (e.g. [154,155] and references therein). Such a model-independent approach could also be useful to measure H 0 .…”

Section: Final Remarksmentioning

confidence: 99%

Remedy of some cosmological tensions via effective phantom-like behavior of interacting vacuum energy

Kumar

2021

Preprint

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Since physics of the dark sector components of the Universe is not yet well-understood, the phenomenological studies of non-minimal interaction in the dark sector could possibly pave the way to theoretical and experimental progress in this direction. Therefore, in this work, we intend to explore some features and consequences of a phenomenological interaction in the dark sector. We use the Planck 2018, BAO, JLA, KiDS and HST data to investigate two extensions of the base ΛCDM model, viz., (i) we allow the interaction among vacuum energy and dark matter, namely the IΛCDM model, wherein the interaction strength is proportional to the vacuum energy density and expansion rate of the Universe, and (ii) the IΛCDM scenario with free effective neutrino mass and number, namely the νIΛCDM model. We also present comparative analyses of the interaction models with the companion models, namely, ΛCDM, νΛCDM, wCDM and νwCDM. In both the interaction models, we find non-zero coupling in the dark sector up to 99% CL with energy transfer from dark matter to vacuum energy, and observe a phantom-like behavior of the effective dark energy without actual "phantom crossing". The well-known tensions on the cosmological parameters H0 and σ8, prevailing within the ΛCDM cosmology, disappear in these models wherein the νIΛCDM model shows consistency with the standard effective neutrino mass and number. Both the interaction models find a better fit to the combined data compared to the companion models under consideration.

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Section: Final Remarksmentioning

confidence: 99%

Remedy of some cosmological tensions via effective phantom-like behavior of interacting vacuum energy

Kumar

2021

Preprint

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“…With high-precision observational data, there will be a chance of detecting the signature of dark sector interactions, in spite of dark degeneracy mentioned in Refs. [81][82][83][84][85][86]. In this paper, we consider the simple interacting vacuum energy model mentioned above and discuss expected cosmological impacts extracted from J-PAS [79,80] measurements.…”

Section: Introductionmentioning

confidence: 99%

J-PAS: forecasts on interacting vacuum energy models

Salzano,

Pigozzo,

Benetti

et al. 2021

Preprint

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“…In addition to this, Alcaniz et al [15] also searched for these interactions using current observations of the Large Scale Structure (LSS), Cosmic Microwave Background anisotropies, BAO measurements, and SNe Ia Hubble diagram. Recently, a plethora of studies have been undertaken in order to understand the dark sector interactions in a model-dependent as well as model-independent fashion, and some of these studies hint towards deviations from the ΛCDM model at low redshifts, that might be associated with the Hubble tension [16][17][18][19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Probing the dark matter density evolution law with large scale structures

Bora,

Holanda,

Desai

2021

Preprint

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We propose a new method to explore a possible departure from the standard time evolution law for the dark matter density. We looked for a violation of this law by using a deformed evolution law, given by ρc(z) ∝ (1 + z) 3+ , and then constrain . The dataset used for this purpose consists of Strong Gravitational Lensing data obtained from SLOAN Lens ACS, BOSS Emission-line Lens Survey, Strong Legacy Survey SL2S, and SLACS; along with galaxy cluster X-ray gas mass fraction measurements obtained using the Chandra Telescope. Although our analyses show that is consistent with zero within 2 σ c.l., the current dataset cannot rule out interacting models of dark matter and dark energy.

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A model-independent reconstruction of dark sector interactions

Cited by 6 publications

References 0 publications

Remedy of some cosmological tensions via effective phantom-like behavior of interacting vacuum energy

Remedy of some cosmological tensions via effective phantom-like behavior of interacting vacuum energy

J-PAS: forecasts on interacting vacuum energy models

Probing the dark matter density evolution law with large scale structures

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