Analytic study of the effect of dark energy-dark matter interaction on the growth of structures

Marcondes, Rafael J. F.; Landim, Ricardo G.; Costa, André A.; Wang, Bin; Abdalla, Élcio

doi:10.1088/1475-7516/2016/12/009

Cited by 48 publications

(45 citation statements)

References 106 publications

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“…Essentially these interacting models invoke energy exchange between the dark components and a small degree of momentum exchange. These scenarios have been intensively investigated in the literature for several dark sector coupling functions and observational approximations [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. It has recently been shown that the current observational data can favor the late time interaction between DE and DM [27][28][29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Observational constraints on dark matter–dark energy scattering cross section

Kumar

Nunes

2017

Eur. Phys. J. C

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In this letter, we report precise and robust observational constraints on the dark matter-dark energy scattering cross section, using the latest data from cosmic microwave background (CMB) Planck temperature and polarization, baryon acoustic oscillations (BAO) measurements and weak gravitational lensing data from CanadaFrance-Hawaii Telescope Lensing Survey (CFHTLenS). The scattering scenario consists of a pure momentum exchange between the dark components, and we find σ d < 10 −29 cm 2 (m dm c 2 /Gev) at 95% CL from the joint analysis (CMB + BAO + CFHTLenS), where m dm is a typical dark matter particle mass. We notice that the scattering among the dark components may influence the growth of large scale structure in the Universe, leaving the background cosmology unaltered.

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Section: Introductionmentioning

confidence: 99%

Observational constraints on dark matter–dark energy scattering cross section

Kumar

Nunes

2017

Eur. Phys. J. C

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“…These baryon acoustic oscillations provide 6 See also Coc, Uzan & Vangioni [24] for more recent predictions of the light element abundances with the results by the Planck satellite mission. a standard ruler for the length scale of clustering of baryonic matter, which is about 150 Mpc today [32].…”

Section: Baryon Acoustic Oscillationsmentioning

confidence: 78%

“…We are now interested in seeing how the growth of structures is affected by the presence of interaction between dark energy and dark matter. The following study produced an interesting result from the theoretical point of view and has been submitted to the Journal of Cosmology and Astroparticle Physics for publication [6]. The fact that the evolution of the growth rate can be solved approximately in an analytic form,…”

Section: Chaptermentioning

confidence: 96%

“…These predictions are in good agreement with current estimates of light element abundances [21], hence serving as a good argument in favor of the Big Bang theory. 6 …”

Section: The Light Element Abundancesmentioning

confidence: 99%

“…These works culminated in the production of two papers [6,7], one of them already published, besides the development of a code for MCMC parameter estimation and another one for obtaining equations of motion and other quantities in GR from a given metric. Both codes are entirely written in python, with potential for a wide variety of uses, and will be made publicly available in the near future.…”

Section: Chapter 7 Final Considerationsmentioning

confidence: 99%

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Interacting dark energy models in Cosmology and large-scale structure observational tests

Marcondes¹

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Marcondes, Rafael José FrançaModelos de energia escura com interação em cosmologia e testes observacionais com estruturas em grande escala. São Paulo, 2016. Finally, I would like to show my most profound gratitude to my girlfriend Nathany for her love, dedication and for being so supportive and sweet. v AbstractModern Cosmology offers us a great understanding of the universe with striking precision, made possible by the modern technologies of the newest generations of telescopes. The standard cosmological model, however, is not absent of theoretical problems and open questions. One possibility that has been put forward is the existence of a coupling between dark sectors. The idea of an interaction between the dark components could help physicists understand why we live in an epoch of the universe where dark matter and dark energy are comparable in terms of energy density, which can be regarded as a strange coincidence given that their time evolutions are completely different.Dark matter and dark energy are generally treated as perfect fluids. Interaction is introduced when we allow for a non-zero term in the right-hand side of their individual energy-momentum tensor conservation equations. We proceed with a phenomenological approach to test models of interaction with observations of redshift-space distortions. In a flat universe composed only of these two fluids, we consider separately two forms of interaction, through terms proportional to the densities of both dark energy and dark matter. An analytic expression for the growth rate approximated as f = Ω γ DM , where Ω DM is the percentage contribution from the dark matter to the energy content of the universe and γ is the growth index, is derived in terms of the interaction strength and of other parameters of the model in the first case, while for the second model we show that a non-zero interaction cannot be accommodated by the index growth approximation. The successful expressions obtained are then used to compare the predictions with growth of structure observational data in a Markov Chain Monte Carlo code and we find that the current growth data alone cannot impose constraints on the interaction strength due to their large uncertainties.We also employ observations of galaxy clusters to assess their virial state via the modified Layzer-Irvine equation in order to detect signs of an interaction. We obtain measurements of observed virial ratios, interaction strength, rest virial ratio and departure from equilibrium for a set of clusters. A compounded analysis indicates an interaction strength of 0.29 +2.25−0.40 , compatible with no interaction, but a compounded rest virial ratio of 0.82 +0.13 −0.14 , which means a 2σ confidence level detection. Despite this tension, the method produces encouraging results while still leaves room for improvement, possibly by removing the assumption of small departure from equilibrium.Keywords: Cosmology, Dark energy, Dark matter, Large-scale structure vii Resumo A cosmologia moderna oferece um ótimo entendimento do universo com...

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Interacting Dark Energy and Its Implications for Unified Dark Sector

Keshav MV,

Arun

2024

Int J Theor Phys

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Analytic study of the effect of dark energy-dark matter interaction on the growth of structures

Cited by 48 publications

References 106 publications

Observational constraints on dark matter–dark energy scattering cross section

Observational constraints on dark matter–dark energy scattering cross section

Interacting dark energy models in Cosmology and large-scale structure observational tests

Interacting Dark Energy and Its Implications for Unified Dark Sector

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