A cosmology calculator that computes times and distances as a function of redshift for user-de?ned cosmological parameters has been made available online This paper gives the formulae used by the cosmology calculator and discusses some of its implementation A version of the calculator that allows one to
mulae used by the cosmology calculator and discusses some of its implementa-tion A version of the calculator that allows one to specify the equation of state parameter wand w? is at ACC html, and a version for converting the light travel times usually given in the popular press into redshifts is at DlttCalc html
Principles of Cosmology Useful (and semi-useful) references: Most cosmology textbooks discuss the basic cosmological equa-tions for ? = 0 cosmologies For material with ? 6= 0, one can look at: Peebles, 1993, Principals of Physical Cosmology Hogg 2000, “Distance Measures is Comology,” astro-ph/9905116 Ned Wright’s Cosmology Calculator:
2 The Martin Nilsson in [4, pg 282] relates the form of Goddess holding lengths and appears in the middle plate (Figure 1) with the sealing ring of Mycenae (16th c P X) where there appear or
The proper distance from the origin to rhor is given by: for k=0 So shor(t)=2ct in the radiation-dominated era and shor(t)=3ct in the matter-dominated era Notice that these distances are larger than ct, the distance travelled
Distances in Cosmology an energy density with the cosmological constant, i e The index i refers to the type of particle One can calculate the typical size