Dr. Obinna C UmehPosition: Research FellowE-mail: obinna.umeh(at port.ac.uk)
Telephone: +44 (0)2392 845066Office: DS2.03
Research interests: Nonlinear Cosmological Perturbations theory
My research interests are in the area of theoretical cosmology. The field of cosmology, in general, has been transformed over the last few decades from a subject of phenomenological flavors to a quantitative science. It is on track to delivering unprecedented precision measurements on key observables of the universe. Large amounts of resources have already been invested in missions such as Euclid, LSST, and the SKA and they are expected to deliver large volumes of data. The joint analysis of these data set is expected to deliver less than one percent accuracy on the measurement of some of the cosmological parameters. This improvement is dependent on our ability to understand the theoretical model which predicts these parameters to the same level of accuracy or even better.
My work is designed towards improving our understanding of the standard model of cosmology in preparation for the analysis of future cosmological surveys mentioned above.
My approach involves extending the standard model of cosmology beyond the linear order in perturbation theory to account for effects that ordinarily are not captured by linear treatment.
The three areas I am most interested in are:
1. Higher order statistics.
2. Large-scale dynamical GR corrections.
3. How nonlinear effects could bias cosmological parameters.
The last two effects are not captured at the linear order in perturbation theory, and the first one is a set of observables which cannot be computed from linear perturbation theory result alone.Qualifications: PhD
Teaching responsibilities: Mathematical methods
Publications from UKADS
Publications from INSPIRE
Publications from arXiv
Publications from the UoP Research Portal
External talks (academic)
External talks (outreach)