Research Fellows Directory
Dr Gianni Bernardi
University of Cambridge
My main research area is observational cosmology. Understanding the birth of the first start and galaxies in the Universe represents one of the still unanswered questions in modern cosmology. Theoretical models show that gravity amplified initial density perturbations that grew with time into dark matter halos who hosted the first galaxies. Such galaxies were subsequently responsible for ionizing the intergalactic medium. The details of such process like its timing and the nature of the first galaxies and how they interacted with their surroundings are still unobserved to date, leaving the theoretical scenario essentially unconstrained. My work focuses on the observations of the neutral Hydrogen in the early universe (21 cm cosmology) as a probe of such process and attempt to perform its first observations. My collaborators and me use the new low frequency radio telescopes and participate in the construction of the next generation radio telescopes (HERA and the SKA).
I also use such interferometric arrays to study the formation and physical processes in clusters of galaxies through observations of their radio emission.
In particular, I use the most advanced telescopes to observe the 21cm line from the early Universe in order to understand the birth of the first luminous sources in the Universe and how they impacted the evolution of the intergalactic medium.
Interests and expertise (Subject groups)