955 research outputs found
Excess of high- galaxies as a test for bumpy power spectrum of density perturbations
Modified matter power spectra with approximately Gaussian bump on sub-Mpc
scales can be a result of a complex inflation. We consider five spectra with
different Gaussian amplitudes and locations and run N-body
simulations in a cube at to reveal the halo mass functions
and their evolution with redshift. We have found that the Sheth-Tormen formula
provides a good approximation to a such kind of halo mass functions. In the
considered models the dark matter halo formation starts much more earlier than
in CDM, which in turn can result in an earlier star formation and a
nuclear activity in galaxies and can be detected and tested by, e.g., JWST. At
the halo mass functions are hardly distinguishable from the standard
CDM, therefore the models with the bumpy spectra can be identified in
observations by their excess in number of bright sources at high redshift only.Comment: 9 pages, 5 figures, submitted to MNRA
- …