The character or state of being universal.
universality of free fall
hargânigi-ye oft-e âzâd
Fr.: universlité de chute libre
Same as → weak equivalence principle.
universality of the IMF
hargâni-ye karyâ-ye âqâzin-e jerm
Fr.: universalité de l'IMF
The hypothesis whereby there exists a universal parent → distribution function which describes the stellar → initial mass function in individual star forming events. A consensus appears to have emerged in the community that the stellar IMF is largely invariant for star formation conditions as are found throughout the Local Group of galaxies at the present time. For details and discussion see Pavel Kroupa (2012), Recent advances on IMF research, arXiv.org/abs/astro-ph/1210.1211, and references therein.