Скачать или смотреть The Integrated Sachs-Wolfe Effect in 4D Einstein-Gauss-Bonnet Gravity - Mina Ghodsi

e-poster presented at the XI FoF meeting (2022)

A novel 4-dimensional Einstein-Gauss-Bonnet (4D EGB) gravity has been proposed that asserts to by-pass Lovelock’s theorem and results in a non-trivial contribution to the gravitational dynamics in four-dimensional spacetime [1]. Although inconsistencies have been raised for this theory in nonlinear perturbation limits, the results of the consistent 4D EGB model indicate that the background equations and the linear scalar modes are in good agreement with the initial 4D EGB model. In this work, we study the integrated Sachs–Wolfe (ISW) effect, as a linear phenomenon, in the 4D EGB model. For this purpose, we calculate the evolution of the gravitational potential, the linear growth factor as a function of redshift, the ISW-auto and cross power spectrum as a function of cosmic microwave background (CMB) multipoles for the 4D EGB model and compare those with the one obtained from the ΛCDM model. The results exhibit that the ISW effect in the 4D EGB model is higher than the one obtained from the ΛCDM model. Correspondingly, we indicate that the deviation from the ΛCDM model is directly proportional to the value of the dimensionless coupling parameter



Link to poster: http://fof.oac.uncor.edu/2022/wp-cont...