![Thumbnail of 'Cosmological de Sitter solutions of the semiclassical Einstein equation'](thumbnails/2206.07774.png)
About
Hello, I'm Daniel Siemssen. I'm currently employed at CARIAD and develop tools to enable the development of artificial intelligence and machine learning applications in the Volkswagen Group.
Past positions
- Researcher, University of Wuppertal, Department of Mathematics and Computer Science
- Associate Lecturer in Mathematical Physics, University of York, Department of Mathematics
- Interim Professor in Applied Mathematics, University of Wuppertal, Department of Mathematics and Computer Science
- Postdoctoral Researcher, University of Wuppertal, Department of Mathematics and Computer Science
- Postdoctoral Fellow (FUGA Fellowship), University of Warsaw, Faculty of Physics
- Postdoctoral Fellow (Riemann Fellowship), University of Hannover, Riemann Center
Education
- PhD in Mathematics, University of Genova
- Diploma in Physics, University of Hamburg
Publications
![Thumbnail of 'Cosmological de Sitter solutions of the semiclassical Einstein equation'](thumbnails/2206.07774.png)
![Thumbnail of 'Special cosmological models derived from the semiclassical Einstein equation on flat FLRW space-times'](thumbnails/2112.15050.png)
Special cosmological models derived from the semiclassical Einstein equation on flat FLRW space-times
![Thumbnail of 'Existence and uniqueness of solutions of the semiclassical Einstein equation in cosmological models'](thumbnails/10.1007_s00023-021-01067-8.png)
Existence and uniqueness of solutions of the semiclassical Einstein equation in cosmological models
![Thumbnail of 'An evolution equation approach to linear quantum field theory'](thumbnails/1912.10692.png)
An evolution equation approach to linear quantum field theory
![Thumbnail of 'The cosmological semiclassical Einstein equation as an infinite-dimensional dynamical system'](thumbnails/10.1007_s00023-021-01060-1.png)
The cosmological semiclassical Einstein equation as an infinite-dimensional dynamical system
![Thumbnail of 'Pseudodifferential Weyl calculus on (pseudo-)Riemannian manifolds'](thumbnails/10.1007_s00023-020-00890-9.png)
Pseudodifferential Weyl calculus on (pseudo-)Riemannian manifolds
![Thumbnail of 'An evolution equation approach to Klein-Gordon operators in curved spacetimes'](thumbnails/10.2140_paa.2019.1.215.png)
An evolution equation approach to Klein-Gordon operators in curved spacetimes
![Thumbnail of 'Quantum energy inequalities in pre-metric electrodynamics'](thumbnails/10.1103_PhysRevD.97.025019.png)
Quantum energy inequalities in pre-metric electrodynamics
![Thumbnail of 'Feynman propagators on static spacetimes'](thumbnails/10.1142_S0129055X1850006X.png)
Feynman propagators on static spacetimes
![Thumbnail of 'Electromagnetic potential in pre-metric electrodynamics: causal structure, propagators and quantization'](thumbnails/10.1103_PhysRevD.93.105046.png)
Electromagnetic potential in pre-metric electrodynamics: causal structure, propagators and quantization
![Thumbnail of 'The semiclassical Einstein equation on cosmological spacetimes'](thumbnails/phd.png)
The semiclassical Einstein equation on cosmological spacetimes
PhD Thesis, University of Genoa (2015) / arXiv:1503.01826 [math-ph]
![Thumbnail of 'Scale-invariant curvature fluctuations from an extended semiclassical gravity'](thumbnails/10.1063_1.4908127.png)
Scale-invariant curvature fluctuations from an extended semiclassical gravity
![Thumbnail of 'Enumerating permutations by their run structure'](thumbnails/10.37236_4235.png)
Enumerating permutations by their run structure
![Thumbnail of 'Global existence of solutions of the semiclassical Einstein equation'](thumbnails/10.1007_s00220-014-2099-5.png)
Global existence of solutions of the semiclassical Einstein equation
![Thumbnail of 'Hadamard states for the vector potential on asymptotically flat spacetimes'](thumbnails/10.1142_S0129055X13500025.png)