Cosmological signatures of dark sector physics: the evolution of haloes and spin alignment

Abstract

The standard cosmological paradigm currently lacks a detailed account of physics in the dark sector, the dark matter and energy that dominate cosmic evolution. In this paper, we consider the distinguishing factors between three alternative models -warm dark matter, quintessence and coupled dark matter-energy -and ΛCDM through numerical simulations of cosmological structure formation. Key halo statistics -halo spin/velocity alignment between large-scale structure and neighboring haloes, halo formation time and migration -were compared across cosmologies within the redshift range 0≤z≤2.98. We found the alignment of halo motion and spin to large-scale structures and neighbouring haloes to be similar in all cosmologies for a range of redshifts. The search was extended to low density regions, avoiding non-linear disturbances of halo spins, yet very similar alignment trends were found between cosmologies which are difficult to characterize and use as a probe of cosmology. We found haloes in quintessence cosmologies form earlier than their ΛCDM counterparts. Relating this to the fact that such haloes originate in high density regions, such findings could hold clues to distinguishing factors for the quintessence cosmology from the standard model. Although in general, halo statistics are not an accurate probe of the dark sector physics.

The Effect of Massive Neutrinos on the Halo Spin Flip Phenomenon

“…The signal has been found to be most prominent in the filaments, being robust against the scale variation. Our result has revealed the potential of M flip as a powerful probe of m ν , which seems inconsistent with the claim of [18] that the intrinsic alignments of the galaxy spins fail to discriminate the ΛCDM cosmology from the alternatives including the warm DM models.…”

New physics searches at the BESIII experiment

“…However, the SM relation for the Higgs mass is a potentially divergent infinite sum of quadratically increasing terms that somehow add up to the finite value m Higgs = 125 GeV, a SM feature that many theoretical physicists consider to be unnatural [ 114 ]. The existence of DM is inferred from a number of astrophysical and cosmological observations [ 115 ]. One possibility is that DM may be comprised of electrically neutral, weakly interacting, stable particles with a mass at the electroweak scale.…”

New Physics Searches at the BESIII Experiment

“…However, the SM relation for the Higgs mass is a potentially divergent infinite sum of quadratically increasing terms that somehow add up to the finite value m Higgs = 125 GeV, a SM feature that many theoretical physicists consider to be unnatural [109]. The existence of DM is inferred from a number of astrophysical and cosmological observations [110]. One possibility is that DM may be comprised of electrically neutral, weakly interacting, stable particles with a mass at the electroweak scale.…”