In the past two decades our picture of the Universe has been dramatically refined by observational campaigns that led to the measurement of the temperature fluctuations in the Cosmic Microwave Background and the discovery of the accelerated expansion using supernovae. These new insights led to new ideas about the origin and evolution of the Universe and raised a plethora of new questions. For instance, what are the processes that seeded the rich structures that we observe today and what is causing the Universe to accelerate? Large Scale Structure (LSS), the distribution of matter and galaxies in the Universe has been shown to have the potential to answer some of these questions. For instance, LSS is able to put an upper bound on the total neutrino mass, it can rule out some modifications of gravity and constrain the properties of dark energy models. Finally, deviations from the simplest models of inflation can be probed on the largest scales observable in LSS. Extracting these signals from galaxy and weak lensing surveys is a non-trivial task: galaxies are an imperfect tracer of the non-linear matter distribution and for most of the above mentioned processes, only the imprint on the linear matter distribution is understood to date.
Thus, I am trying to understand how the matter distribution evolves from the linear initial conditions, where galaxies form as well as how fundamental physics and the initial conditions imprint themselves on the final matter and galaxy clustering pattern.
Some of the topics that I am working on are:
- Large Scale Structure (LSS) of the Universe
- Perturbation Theory and Effective Field Theory of Large Scale Structure: more
- Relativistic Corrections for LSS observables
- primordial non-Gaussiantity
- statistics of peaks in Gaussian random fields: more
- clustering of biased tracers