4D Einstein-Gauss-Bonnet gravity

4D Einstein-Gauss-Bonnet gravity

Zahra Haghani

School of Physics, Damghan University


Abstract: In this talk, I will consider the gravitational theory known as the “novel 4D Einstein-Gauss-Bonnet’’ gravity.  First I will have a short review on Lovelock theory and then introduce 4D Einstein-Gauss-Bonnet gravity. This theory has the same properties as GR in a maximally symmetric background and also at the perturbative level. This degeneracy will disappear in the static spherically symmetric and FLRW spacetimes.  In the static spherically symmetric space-time the Ricci scalar does not vanish due to the contributions from the Gauss-Bonnet term. In this case, we will have two branches of solutions. At large distances, one of these branches reduces to the Schwarzschild solution with positive gravitational mass. I will also consider matter perturbations and obtain the best-fit value of the model parameter using the Hubble parameter and fσ8 observational data and compare results with the ΛCDM model.


یکشنبه 25 آبان 1399، ساعت 19:00

Sunday 15 November 2020 – 19:00 Tehran Time

اتاق سمینار مجازی –Virtual Seminar Room


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