Testing (modified) gravity with 3D and tomographic cosmic shear

Mancini, Alessio Spurio; Reischke, Robert; Pettorino, V.; Schäfer, Björn Malte; Zumalacárregui, Miguel

doi:10.1093/mnras/sty2092

Cited by 36 publications

(28 citation statements)

References 112 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These are instead very important in the interpretation of data since substantial part of GC, CMB lensing and WL data originates from non-linear scales. A phenomenological way to mimic screening mechanisms has been recently introduced [141,208] which highlighted the urgency of the inclusion for nonlinearities in the data analysis as these have been proven to increase the constraints on the EFT functions [219]. In this regard, a number of pioneer work contributed to incorporate non-linear effects to the EFT framework [57,59,60].…”

Section: Discussionmentioning

confidence: 99%

“…Since the EFT framework does not rely on a specific model but allows to make general prediction on large classes of models, it provides a powerful benchmark for forecasting the cosmological signals to which the future missions will give access to. In the following, we review the cosmological forecasts analyses performed using the pure EFT approach [217,199,218,65,216,219,130]. Also in this case, the class of models that has been largely explored belongs to the pure Horndeski models.…”

Section: Forecasts With Next Generation Surveysmentioning

confidence: 99%

“…This points to the danger of using Fisher forecasts for non-Gaussian likelihoods in forecast investigations. Finally, the model is investigated using two cosmic shear methods [219]: the tomographic method, where the correlations between the lensing signal in different redshifts bins allow to keep track of the redshift information, and the 3D approach, where all the redshift information is carried throughout the analysis. For an Euclide-like experiment, the 3D analysis is shown to constrain the model better than the tomographic approach by about 20% thanks to the increased redshift information (see Figure 21).…”

Section: Forecasts With Next Generation Surveysmentioning

confidence: 99%

See 2 more Smart Citations

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

Section: Discussionmentioning

confidence: 99%

Section: Forecasts With Next Generation Surveysmentioning

confidence: 99%

Section: Forecasts With Next Generation Surveysmentioning

confidence: 99%

See 1 more Smart Citation

Effective field theory of dark energy: A review

2020

View full text Add to dashboard Cite

show abstract

“…parameters Ω cdm , Ω b , θ s , A s , n s and τ reio -for technical details regarding the MCMC implementation (as well as for additional details on the implementation and use of the data sets involved) see [34]. For related cosmological parameter constraints on deviations from GR using general parameterised approaches and a variety of (current and forecasted) experimental data, see [17,18,34,[48][49][50][51][52][53][54][55][56][57][58][59][60] All the constraints computed here assume α T = 0 as a prior to ensure compatibility with the speed of gravity constraints from GW170817 (as discussed in detail above), but we consider constraints with and without the further prior (7) from requiring the absence of GW-induced gradient instabilities. For reference throughout the remainder of this section, we adopt the following shorthands in referring to the datasets we use (as well as the additional GW prior):…”

Section: Cosmological Parameter Constraintsmentioning

confidence: 99%

Cosmological constraints on dark energy in light of gravitational wave bounds

Noller

2020

Phys. Rev. D

View full text Add to dashboard Cite

Gravitational wave (GW) constraints have recently been used to significantly restrict models of dark energy and modified gravity. New bounds arising from GW decay and GW-induced dark energy instabilities are particularly powerful in this context, complementing bounds from the observed speed of GWs. We discuss the associated linear cosmology for Horndeski gravity models surviving these combined bounds and compute the corresponding cosmological parameter constraints, using CMB, redshift space distortion, matter power spectrum and BAO measurements from the Planck, SDSS/BOSS and 6dF surveys. The surviving theories are strongly constrained, tightening previous bounds on cosmological deviations from ΛCDM by over an order of magnitude. We also comment on general cosmological stability constraints and the nature of screening for the surviving theories, pointing out that a raised strong coupling scale can ensure compatibility with gravitational wave constraints, while maintaining a functional Vainshtein screening mechanism on solar system scales. Finally, we discuss the quasi-static limit as well as (constraints on) related observables for near-future surveys.

show abstract

“…2 The structure of the code and the modifications with respect to the CLASS code are described in detail in the first hi_class paper [55]. hi_class can be used to explore different aspects of gravitational theories and their cosmological implications [66][67][68][69][70], test models against current data [19,[71][72][73] or in preparation for future experiments [36,74,75]. 3 hi_class has been cross-validated against other codes both implementing a general EFTDE framework (e.g.…”

Section: Horndeski's Theory and The Hi_class Codementioning

confidence: 99%

`hi_class` background evolution, initial conditions and approximation schemes

Bellini

Sawicki

Zumalacárregui

2020

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

Cosmological datasets have great potential to elucidate the nature of dark energy and test gravity on the largest scales available to observation. Theoretical predictions can be computed with hi_class (www.hiclass-code.net), an accurate, fast and flexible code for linear cosmology, incorporating a wide range of dark energy theories and modifications to general relativity. We introduce three new functionalities into hi_class: (1) Support for models based on covariant Lagrangians, including a constraint-preserving integration scheme for the background evolution and a series of worked-out examples: Galileon, nKGB, quintessence (monomial, tracker) and Brans-Dicke. (2) Consistent initial conditions for the scalar-field perturbations in the deep radiation era, identifying the conditions under which modified-gravity isocurvature perturbations may grow faster than adiabatic modes leading to a loss of predictivity. (3) An automated quasistatic approximation scheme allowing order-of-magnitude improvement in computing performance without sacrificing accuracy for wide classes of models. These enhancements bring the treatment of dark energy and modified gravity models to the level of detail comparable to software tools restricted to standard ΛCDM cosmologies. The hi_class code is publicly available (https://github.com/miguelzuma/hi_class_public), ready to explore current data and prepare for next-generation experiments.

show abstract

Testing (modified) gravity with 3D and tomographic cosmic shear

Cited by 36 publications

References 112 publications

Effective field theory of dark energy: A review

Effective field theory of dark energy: A review

Cosmological constraints on dark energy in light of gravitational wave bounds

`hi_class` background evolution, initial conditions and approximation schemes

Contact Info

Product

Resources

About

Testing (modified) gravity with 3D and tomographic cosmic shear

Cited by 36 publications

References 112 publications

Effective field theory of dark energy: A review

Effective field theory of dark energy: A review

Cosmological constraints on dark energy in light of gravitational wave bounds

hi_class background evolution, initial conditions and approximation schemes

Contact Info

Product

Resources

About

`hi_class` background evolution, initial conditions and approximation schemes