Center for Theoretical Physics of the Universe (CTPU)

# Towards an explicit construction of de-Sitter solutions in D=10 supergravity

## by Prof. Nakwoo Kim (Kyung Hee University)

Asia/Seoul
On-line seminar

### On-line seminar

Description
We revisit the stringy construction of four-dimensional de-Sitter solutions using orientifolds O8±, proposed by Córdova et al. arXiv:1911.04498. While the original analysis of the supergravity equations is largely numerical, we obtain semi-analytic solutions by treating the curvature as a perturbative parameter. At each order we verify that the (permissive) boundary conditions at the orientifolds are satisfied. To illustrate the advantage of our result, we calculate the four-dimensional Newton constant as a function of the cosmological constant. We also discuss how the discontinuities at O8− can be accounted for in terms of corrections to the worldvolume action.