Physics and Astronomy Colloquium
Scale hierarchies in particle physics and cosmology
Presented by Ignatios Antoniadis, LPTHE Sorbonne Paris
Particle physics studies the elementary constituents of matter and their fundamental forces. Very short distances are explored by particle collisions at very high energies, creating conditions similar to those governing the Universe just after the Big Bang. This is the reason that the same physics is also explored by cosmology through observations on the sky at very large distances.
The current theory of particle physics, called Standard Model, provides an accurate description of all known physical phenomena in the microcosmos. On the other hand, the Standard Model of cosmology describes very well observations, confirmed recently by the Planck satellite experiments, pointing to the existence of a new dark sector of the Universe containing dark matter and dark energy.
I will discuss the problem of scale hierarchies in particle physics and cosmology and propose ways to address it. In particular I will present a framework of unifying two theoretical proposals beyond the standard models of particle physics and cosmology: supersymmetry and inflation, by identifying the inflaton boson with the superpartner of the Goldstone fermion of spontaneous supersymmetry breaking and will describe its phenomenological consequences.
3:30 pm, Friday, April 28, 2023
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