Abstract
In the last few decades, cosmological measurements have reached an unprecedented level of precision, and cosmology is now on the threshold of a new era of observational evidence. In the next future, a vast number of telescopes, satellites and surveys will provide us with accurate, multi-wavelength data that will allow us to investigate the fundaments of our theoretical model of the Universe. Here, we depict, with some useful example, how such a gaze to the deepest cosmos could help in better understanding the laws of gravity and perhaps detecting departures from GR. Specifically, we show recent constraints on well-known alternative gravity theories from some of these next-generation instruments.
Highlights
In the last decades, cosmologists proposed several models alternative to the concordance Λ cold dark matter (ΛCDM) paradigm
The structure of this paper will be threefold: in § 2, we shall describe the rôle of General Relavity (GR) in the ΛCDM model, and why the idea of modifying GR has arisen; secondly, § 3 will outline the reasons why deep and large-scale cosmology is one of the best possible arenas for testing GR and its competitors, and we shall as well introduce some cardinal cosmological observables; eventually, some conclusions will be drawn in § 4, by showing recent constraints and forecasts on some well-known modified gravity models
The ΛCDM model is based on two cornerstones: on the one hand, GR encodes the properties of spacetime; on the other hand, the Standard Model of Particle Physics provides us with the energy and matter species that fill the cosmos
Summary
Cosmologists proposed several models alternative to the concordance Λ cold dark matter (ΛCDM) paradigm. The temperature anisotropy pattern of the cosmic microwave background (CMB) radiation [1], the dynamics of the large-scale structure of the Universe [2] and the present-day cosmic accelerated expansion [3] In these theories, crucial topics such as the missing mass in galaxies and galaxy clusters and the current Universe’s accelerated expansion are not explained by usual cold dark matter and the cosmological constant Λ. To just give some name, leaving a deeper search to the interested reader, we may quote: the ongoing CMB experiment Planck, in the microwave band; LOFAR and the SKA pathfinders such as EMU and WODAN, in the radio band; SDSS and the CFHT Survey Legacy, DES, LSST, Pan-STARRS, and the future Euclid satellite, for the optical band The structure of this paper will be threefold: in § 2, we shall describe the rôle of GR in the ΛCDM model, and why the idea of modifying GR has arisen; secondly, § 3 will outline the reasons why deep and large-scale cosmology is one of the best possible arenas for testing GR and its competitors, and we shall as well introduce some cardinal cosmological observables; eventually, some conclusions will be drawn in § 4, by showing recent constraints and forecasts on some well-known modified gravity models
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