Weigh Them All!
Cosmological Searches for the Neutrino Mass Scale and Mass Ordering
The three neutrinos are ghostly elementary particles that exist all across the Universe. Though every second billions of them
fly through us, they are extremely hard to detect. We used to think they had no mass, but recently discovered that in fact they have a tiny mass. Les mer
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På grunn av Brexit-tilpasninger og tiltak for å begrense covid-19 kan det dessverre oppstå forsinket levering.
The three neutrinos are ghostly elementary particles that exist all across the Universe. Though every second billions of them
fly through us, they are extremely hard to detect. We used to think they had no mass, but recently discovered that in fact
they have a tiny mass. The quest for the neutrino mass scale and mass ordering (specifying how the three masses are distributed)
is an extremely exciting one, and will open the door towards new physics operating at energy scales we can only ever dream
of reaching on Earth. This thesis explores the use of measurements of the Cosmic Microwave Background (the oldest light reaching
us, a snapshot of the infant Universe) and maps of millions of galaxies to go after the neutrino mass scale and mass ordering.
Neutrinos might teach us something about the mysterious dark energy powering the accelerated expansion of the Universe, or
about cosmic inflation, which seeded the initial conditions for the Universe. Though extremely baffling, neutrinos are also
an exceptionally exciting area of research, and cosmological observations promise to reveal a great deal about these elusive
particles in the coming years.
Introduction.- Standard Models and What Lies Beyond.- Overview of Physical Cosmology.- Massive Neutrinos and How to Search
for them with Cosmological Observations.- A Brief Interlude Statistical Methods in Cosmology.- Results and discussion of included
papers.- Summary and Outlook.
Originally from Italy, Sunny Vagnozzi studied Physics at the University of Trento (BSc, 2012), at the University of Melbourne
(MSc, 2014), and finally at Stockholm University, where he obtained his PhD in Theoretical Physics in 2019. He is currently
a researcher at the University of Cambridge, where he holds a Newton-Kavli Fellowship. His research is at the interface of
cosmology, astrophysics, and particle physics, and aims to address fundamental questions about the origin, composition, and
fate of the Universe.