Contact
Name
Christian Fidler

Position
Former member
Member from October 2014 to September 2017
Current position: Postdoc at RWTH, AAchen University, Germany
Research statement
I am interested in the dynamics of the Universe, both at early times related to the CMB and at late times for the large scale structure.
SONG
I am involved in the development of the non-linear Boltzmann code SONG. This code simulates the early Universe at unrivalled precision including all standard model species.

It currently is used to compute:
-B mode polarisation of the CMB induced from non-linear dynamics after inflation
-Non-Guassianity in the temperature and polarisation of the CMB from non-linear dynamics
- Spectral Distortions in the CMB from reionisation

Working on this project I have gained valuable experience in numerical simulations and programming. I also have a good understanding of numerical mathematics and have designed several new methods fit for the computations performed by SONG.

Theoretical Cosmology
I am working on the theoretical framework related to non-linear simulations.

- My work contributes to developing the framework of second-order cosmological perturbation theory. I have derived the polarised non-linear Boltzmann equations.
- I am working on a new formalism for non-linear propagation of photons in curved spaces.
Projects
Research directions:
Cosmology and General Relativity

Experiments and collaborations:
Planck

Non-active projects
Publications in CP3
All my publications on Inspire

Number of publications as CP3 member: 10 Download BibTeX

Last 5 publications

2017

CP3-17-35: CMB anisotropies from patchy reionisation and diffuse Sunyaev-Zel'dovich effects
Christian Fidler and Christophe Ringeval

[Abstract] [PDF] [Journal] [Dial]
Published in JCAP 1710 (2017) 026
Refereed paper. September 6.
CP3-17-34: General relativistic weak-field limit and Newtonian N-body simulations
Fidler, Christian and Tram, Thomas and Rampf, Cornelius and Crittenden, Robert and Koyama, Kazuya and Wands, David

[Abstract] [PDF] [Journal] [Dial]
Refereed paper. September 4.
CP3-17-33: The effect of early radiation in N-body simulations of cosmic structure formation
Adamek, Julian and Brandbyge, Jacob and Fidler, Christian and Hannestad, Steen and Rampf, Cornelius and Tram, Thomas

[Abstract] [PDF] [Journal] [Dial]
Refereed paper. September 4.
CP3-17-32: Relativistic initial conditions for N-body simulations
Fidler, Christian and Tram, Thomas and Rampf, Cornelius and Crittenden, Robert and Koyama, Kazuya and Wands, David

[Abstract] [PDF] [Journal] [Dial]
Refereed paper. September 4.
CP3-17-31: Kinetic theory of fermions in curved spacetime
Fidler, Christian and Pitrou, Cyril

[Abstract] [PDF] [Journal] [Dial]
Refereed paper. September 4.

More publications