Angular size in an expanding universe

Details Angular size in an expanding universe Angular size in an expanding universe

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986amjph..54.1008j&link_type=abstract

American Journal of Physics, Volume 54, Issue 11, pp. 1008-1011 (1986).

Physics

3

Scientific paper

The redshift zm at which angular size (for objects of equal linear size) is a minimum is examined for expanding, dust-filled, Robertson-Walker universes obeying the Einstein field equations with vanishing cosmological constant. It is shown that zm and the deceleration parameter q are monotonically decreasing functions of one another, and that closed-form expressions can be obtained for both zm(q) and q(zm). The explicit form of the latter function is presented.

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