Syksy Räsänen

TL;DR: In this article, the authors review the effect of the formation of nonlinear structures on the expansion rate, spatial curvature, and light propagation in the universe, focusing on the possibility that this effect could explain cosmological observations without requiring the introduction of dark energy or modified gravity.

TL;DR: The trace-free property of backreaction in cosmology was shown to be unphysical in this paper, and the scheme that underlies the trace free theorem does not involve averaging and therefore does not capture crucial non-local effects.

TL;DR: In this paper, the effect of the formation of nonlinear structures on the expansion rate, spatial curvature and light propagation in the universe is reviewed, focusing on the possibility that it could explain cosmological observations without the introduction of dark energy or modified gravity.

TL;DR: In this article, the authors compare Higgs inflation in the metric and Palatini formulations of general relativity, with loop corrections are treated in a simple approximation, and conclude that if Higgs is the inflaton, inflationary observables can be used to distinguish different gravitational degrees of freedom, in this case to determine whether the connection is an independent variable.

TL;DR: A new test of the validity of the Friedmann-Lemaître-Robertson-Walker (FLRW) metric is presented, based on comparing the distance from redshift 0 to z(1) and from z (1) to z (2) to thedistance from 0 toZ(2).