Leo P B Goutte
I am a graduate student at McGill University in Tami Pereg-Barnea's condensed matter theory group. When I'm not in "physics mode", I like to read, take pictures, bike, play guitar and listen to the Talking Heads.
Supervisors: Tami Pereg-Barnea
Supervisors: Tami Pereg-Barnea
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The 21-cm signal from neutral hydrogen is one of the most promising ways of exploring the dark ages of the universe. Using this signal to understand the universe has gained lots of attention and there exists a wide range of literature and theories about the signal. In 2018, the EDGES collaboration reported the first detection of the 21-cm signal and, surprisingly, their detection was outside the range of the predicted measurements. If confirmed, current models for the dark ages of the universe must be revised to account for this detection. In this paper, we use a Nested Sampling algorithm (PolyChord, Handley Handley (2015)) to perform Bayesian model selection and determine if the data presented supports discarding the current models. We find decisive evidence against current models; they cannot explain the data presented by EDGES.
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The 21-cm signal from neutral hydrogen is one of the most promising ways of exploring the dark ages of the universe. Using this signal to understand the universe has gained lots of attention and there exists a wide range of literature and theories about the signal. In 2018, the EDGES collaboration reported the first detection of the 21-cm signal and, surprisingly, their detection was outside the range of the predicted measurements. If confirmed, current models for the dark ages of the universe must be revised to account for this detection. In this paper, we use a Nested Sampling algorithm (PolyChord, Handley Handley (2015)) to perform Bayesian model selection and determine if the data presented supports discarding the current models. We find decisive evidence against current models; they cannot explain the data presented by EDGES.