Quantum gravity quantum cosmology and lorentzian geometries giampiero esposito no boundary wave function and the partition function of tunneling geometries in quantum gravity and cosmology . I have thus tried to use language familiar to readers working on classical and quantum gravity paying attention both to difficult calculations and to existence theorems and discussing in detail the current literature the first aim of the book is to describe recent work on the problern of boundary conditions in one loop quantum cosmology. I have thus tried to use language familiar to readers working on classical and quantum gravity paying attention both to difficult calculations and to existence theorems and discussing in detail the current literature the first aim of the book is to describe recent work on the problem of boundary conditions in one loop quantum cosmology. Quantum gravity quantum cosmology and lorentzian geometries authors esposito giampiero free preview