Abstract
We investigate the potential power of the Cosmic Mach Number(CMN), which is the ratio between the mean velocity and thevelocity dispersion of galaxies as a function of cosmic scales, toconstrain cosmologies. We first measure the CMN from 4 catalogsof galaxy peculiar velocity surveys at low redshift(z∊[0.002,0.03]), and use them to contrast cosmologicalmodels. Overall, current data is consistent with the WMAP7ΛCDM model. We find that the CMN is highly sensitive tothe growth of structure on scales k∊[0.01,0.1] h/Mpc inFourier space. Therefore, modified gravity models, and models withmassive neutrinos, in which the structure growth genericallydeviates from that of the ΛCDM model in a scale-dependentway, can be well differentiated from the ΛCDM model byusing future CMN data.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
