Conveners
Parallel: Cosmology 2
- Seokhoon Yun (University of Padova)
We propose a minimal supersymmetric local U(1) B-L model. A stochastic gravitational wave background and ultrahigh-energy cosmic rays are expected, and can be probed in the near future experiments.
The coupling between a pseudo-scalar inflaton and a gauge field leads to an amount of additional density perturbations and gravitational waves (GWs) that is strongly sensitive to the inflaton speed. This naturally results in enhanced GWs at (relatively) small scales that exited the horizon well after the CMB ones, and that can be probed by a variety of GW observatories (from pulsar timing...
We present distinctive properties of multi-component dark matter from the structure formation of halos on small scale. We solve linear Einstein-Boltzmann equations, and show how density contrasts and the power spectrum change. To incorporate non-linear effects, we use the above result to perform N-body simulations, and discuss various phenomenological aspects of the model.
Using data from upcoming (Stage-IV) cosmological surveys, we jointly reconstruct the Universe’s growth and expansion histories using forward modeling and Gaussian Processes. Our approach only relies on a few reasonable assumptions, namely:
- A (flat) Friedmann-Lemaître-Robertson-Walker metric,
- An Einstein De Sitter (matter-dominated) Universe at high redshift.
We forecast the...
We study the possibility of generating baryon asymmetry of the universe from dark matter (DM) annihilations during non-standard cosmological epochs. Considering the DM to be of weakly interacting massive particle (WIMP) type, the generation of baryon asymmetry via leptogenesis route is studied where WIMP DM annihilation produces a non-zero lepton asymmetry. Adopting a minimal particle physics...
