TY - GENERIC DO - UR - http://dx.doi.org/ TI - Hartle-Hawking boundary conditions as Nucleation by de Sitter Vacuum T2 - Preprints AU - Corda, Christian AU - Feleppa, Fabiano AU - Licata, Ignazio PY - 2019 DA - 2019/09/13 PB - Preprints