Can modified gravity models reconcile the tension between the CMB anisotropy and lensing maps in Planck-like observations?

Hu, Bambi; Raveri, Marco

doi:10.1103/physrevd.91.123515

Cited by 26 publications

(11 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Intriguingly, the simplest cosmological framework of the concordance ΛCDM cosmology has always been found to be in an excellent agreement with these cosmological observations, and its parameters have now been determined to an impressive accuracy [1]. Thus, given that this model has survived this avalanche of high precision data, robust constraints on new physics beyond the ΛCDM model are always getting tighter [2][3][4][5][6][7][8]. Nevertheless, there have been indications in the data that are not well described by the ΛCDM model.…”

Section: Introductionmentioning

confidence: 91%

Searching for dark matter-dark energy interactions: Going beyond the conformal case

Bruck

Mifsud

2018

Phys. Rev. D

View full text Add to dashboard Cite

We consider a generic cosmological model which allows for non-gravitational direct couplings between dark matter and dark energy. The distinguishing cosmological features of these couplings can be probed by current cosmological observations, thus enabling us to place constraints on this generic interaction which is composed of the conformal and disformal coupling functions. We perform a global analysis in order to independently constrain the conformal, disformal, and mixed interactions between dark matter and dark energy by combining current data from: Planck observations of the cosmic microwave background radiation anisotropies, a combination of measurements of baryon acoustic oscillations, a supernovae Type Ia sample, a compilation of Hubble parameter measurements estimated from the cosmic chronometers approach, direct measurements of the expansion rate of the Universe today, and a compilation of growth of structure measurements. We find that in these coupled dark energy models, the influence of the local value of the Hubble constant does not significantly alter the inferred constraints when we consider joint analyses that include all cosmological probes. Moreover, the parameter constraints are remarkably improved with the inclusion of the growth of structure data set measurements. We find no compelling evidence for an interaction within the dark sector of the Universe.

show abstract

Section: Introductionmentioning

confidence: 91%

Searching for dark matter-dark energy interactions: Going beyond the conformal case

Bruck

Mifsud

2018

Phys. Rev. D

View full text Add to dashboard Cite

show abstract

“…The linear EFT model has also been explored to gauge whether this proposal could reconcile the tension between Planck CMB estimation of the lensing amplitude parameter A L and the result from the lensing reconstruction [203]. Simulations of CMB anisotropy and CMB lensing spectra, assuming Planck 2015's best-fit values and Planck blue book on beam and noise specifications, show that models with an effective Newton constant stronger than G N can have a modulating effect similar to that of A L [204]. Nevertheless, this induces higher values of σ 8,0 making the tension with WL surveys more severe [13,15,14,16,180,181].…”

Section: Running Planck Massmentioning

confidence: 99%

Effective field theory of dark energy: A review

2020

View full text Add to dashboard Cite

The discovery of cosmic acceleration has triggered a consistent body of theoretical work aimed at modeling its phenomenology and understanding its fundamental physical nature. In recent years, a powerful formalism that accomplishes both these goals has been developed, the so-called effective field theory of dark energy. It can capture the behavior of a wide class of modified gravity theories and classify them according to the imprints they leave on the smooth background expansion history of the Universe and on the evolution of linear perturbations. The effective field theory of dark energy is based on a Lagrangian description of cosmological perturbations which depends on a number of functions of time, some of which are non-minimal couplings representing genuine deviations from standard gravity. Such a formalism is thus particularly convenient to fit and interpret the wealth of new data that will be provided by future galaxy surveys. Despite its recent appearance, this formalism has already allowed a systematic investigation of what lies beyond the standard gravity landscape and provided a conspicuous amount of theoretical predictions and observational results. In this review, we report on these achievements. Conclusion and outlook 94Appendix A Acronyms and symbols 971. Scalar-tensor theoriesà la Brans-Dicke, hereafter dubbed Generalized

show abstract

“…With respect to the original Horndeski formulation that describes different DE/MG models with several free functions of the scalar field and its kinetic energy, the EFT approach, gets rid of possible redundancies by compressing the freedom in defining them in a limited set of functions of time only [26,27]. This makes the EFT language especially suited to efficiently explore the observational implications of such models from an EFT perspective [28][29][30][31][32][33][34][35][36][37][38][39] while at the same time retaining the possibility to test specific models once they are mapped to the EFT of DE [40][41][42][43][44][45].…”

Section: Parametrized Dark Energy and Gravitymentioning

confidence: 99%

Reconstructing gravity on cosmological scales

Raveri

2020

Phys. Rev. D

Self Cite

View full text Add to dashboard Cite

We present the data-driven reconstruction of gravitational theories and Dark Energy models on cosmological scales. We showcase the power of present cosmological probes at constraining these models and quantify the knowledge of their properties that can be acquired through state of the art data. This reconstruction exploits the power of the Effective Field Theory approach to Dark Energy and Modified Gravity phenomenology, which compresses the freedom in defining such models into a finite set of functions that can be reconstructed across cosmic times using cosmological data. We consider several model classes described within this framework and thoroughly discuss their phenomenology and data implications. We find that some models can alleviate the present discrepancy in the determination of the Hubble constant as inferred from the cosmic microwave background and as directly measured. This results in a statistically significant preference for the reconstructed theories over the standard cosmological model.

show abstract

Can modified gravity models reconcile the tension between the CMB anisotropy and lensing maps in Planck-like observations?

Cited by 26 publications

References 46 publications

Searching for dark matter-dark energy interactions: Going beyond the conformal case

Searching for dark matter-dark energy interactions: Going beyond the conformal case

Effective field theory of dark energy: A review

Reconstructing gravity on cosmological scales

Contact Info

Product

Resources

About