Conveners
Session 8: Neutrinos and Light Relics
- Ben Wallisch
We explore a self-interacting neutrino cosmology in which neutrinos experience a delayed onset of free-streaming. We use the effective field theory of large-scale structure (LSS) to model matter distribution on mildly non-linear scales within the self-interacting neutrino cosmology for the first time. We perform the first combined likelihood analysis of BOSS full-shape galaxy clustering, weak...
Cosmology offers a unique opportunity to explore new physics with tiny interactions to the Standard Model particles. This is particular useful for studying new physics scenarios that address hierarchy problems while evading collider detections. I will briefly review three examples where data from the Large Scale Structure is crucial for identifying signals of solutions to hierarchical...
According to the Standard Model (SM), neutrinos begin to free-stream as the Universe cools to approximately 1.5 MeV, leaving distinctive imprints in cosmological observables. Interestingly, several analyses have revealed that some cosmic microwave background (CMB) data allow a cosmological scenario in which, due to self-interactions, the onset of neutrino-free streaming occurs close to the...
Neutrinos become nonrelativistic at late times and cluster anisotropically behind moving halos, forming neutrino wakes in the opposite direction to the halo motion and causing halos to slow down due to dynamical friction. We show that this effect can be best extracted from future large scale structure surveys via three point cross correlations involving galaxies and a tracer of the matter...
Upcoming cosmological surveys will probe the impact of a non-zero sum of neutrino masses on the growth of structures. These measurements are sensitive to the behavior of neutrinos at cosmic distances, making them a perfect testbed for neutrino physics beyond the standard model at long ranges. In this talk, I will introduce a novel signal from long-range self-interactions between neutrinos. In...
