saltshaker.util.cosmo

Functions

`A`(z[, Om, Ode, w0, wa, H0, debug])	angular diameter distance with Omega_matter, from Eisenstein:2005 (see also Kessler:2009)
`DA`(z[, Om, Ode, w0, wa, H0, unit, debug])	angular diameter distance
`DC`(z[, H0, Om, Ode, n, unit])	Comoving radial distance out to redshift z, which goes into the Hubble law.
`DL`(z[, Om, Ode, w0, wa, H0, unit, Flat, ...])	Luminosity distance calculation allowing w!=-1.
`DLFw`(z[, w, Om, H0, unit, debug])	luminosity distance for constant w in a flat universe
`DL_Wright`(z[, H0, Om, Ode, n, unit])	Ned Wright's version.
`E`(z[, Om, Ode, w0, wa, H0, debug])	The dimensionless expansion rate : E(z) = H(z) / H0 (squared, this is he LHS of the Friedmann eqn)
`Or`(h)
`R`(z[, Om, Ode, w0, wa, H0, debug])	The shift parameter, constrained by CMB measurments in Komatsu:2008 (see also Kessler:2009)
`agez`(z[, H0, Om, Ode, n, unit, debug])	The age of the universe at redshift z set unit=None to get the age in units of 1/H0
`calculate`(z[, H0, Om, Ode, n])	all the cosmo calculations together
`main`()
`mu`(z[, H0, Om, Ode, w0, wa])	Distance modulus to redshift z, for the given cosmology
`mue`(z[, H0, Om, Ode, w0, wa, Flat, Lambda])	Distance modulus to redshift z, relative to an empty universe.
`rsDv`(z[, Om, Ode, w0, wa, H0, debug])	rs / Dv : BAO constraint from Percival:2010 and Komatsu:2010 rs = sound horizon distance Dv = baryon drag epoch
`volume`(z[, H0, Om, Ode, n, unit])	comoving volume out to redshift z.
`zfromd`(d[, H0, Om, Ode, w0, wa])	given a distance in Mpc, compute the redshift for the assumed cosmology
`zfromt`(t[, H0, Om, unit, debug])	The redshift z when the universe has an age t.

saltshaker.util.cosmo.Or(h)

saltshaker.util.cosmo.main()

saltshaker.util.cosmo.calculate(z, H0=70, Om=0.3, Ode=0.7, n=1000): all the cosmo calculations together

saltshaker.util.cosmo.zfromt(t, H0=70, Om=0.3, unit='Gyr', debug=False): The redshift z when the universe has an age t. set unit=None for ages in units of 1/H0 From Peebles:1993 p.315 This is crude, and only applicable for a flat lambdaCDM universe. Errors approach 1% at z=25.

saltshaker.util.cosmo.agez(z, H0=70, Om=0.3, Ode=0.7, n=1000, unit='Gyr', debug=False): The age of the universe at redshift z set unit=None to get the age in units of 1/H0

saltshaker.util.cosmo.DC(z, H0=70, Om=0.3, Ode=0.7, n=1000, unit=None): Comoving radial distance out to redshift z, which goes into the Hubble law. Use unit=None for distance in units of c/H0

saltshaker.util.cosmo.DL_Wright(z, H0=70, Om=0.3, Ode=0.7, n=1000, unit=None): Ned Wright’s version. No w. Luminosity distance out to redshift z. Units may be Mpc or Gpc, or use unit=None for distance in units of c/H0

saltshaker.util.cosmo.DLFw(z, w=-1, Om=0.3, H0=70, unit=None, debug=False): luminosity distance for constant w in a flat universe

saltshaker.util.cosmo.DL(z, Om=0.3, Ode=0.7, w0=-1, wa=0, H0=70, unit=None, Flat=False, Lambda=False, debug=False)

Luminosity distance calculation allowing w!=-1.

Allows w to vary with time using a linear parameterization: w(a) = w0 + wa(1-a). To get a constant w, just set wa=0 and use w0 as w. Set Flat=True to enforce a flat universe (Ode=1-Om). Set Lambda=True to force a constant w=-1.

saltshaker.util.cosmo.mu(z, H0=70, Om=0.3, Ode=0.7, w0=-1, wa=0): Distance modulus to redshift z, for the given cosmology

saltshaker.util.cosmo.mue(z, H0=70, Om=0.3, Ode=0.7, w0=-1, wa=0, Flat=False, Lambda=False): Distance modulus to redshift z, relative to an empty universe. Set Flat=True to enforce a flat universe (Ok=0) by overriding the Ode parameter.

saltshaker.util.cosmo.zfromd(d, H0=70, Om=0.3, Ode=0.7, w0=-1, wa=0): given a distance in Mpc, compute the redshift for the assumed cosmology

saltshaker.util.cosmo.volume(z, H0=70, Om=0.3, Ode=0.7, n=1000, unit='Mpc'): comoving volume out to redshift z. unit may by ‘Mpc’ or ‘Gpc’

saltshaker.util.cosmo.E(z, Om=0.3, Ode=0.7, w0=-1, wa=0, H0=70, debug=False): The dimensionless expansion rate : E(z) = H(z) / H0 (squared, this is he LHS of the Friedmann eqn)

saltshaker.util.cosmo.DA(z, Om=0.3, Ode=0.7, w0=-1, wa=0, H0=70, unit=None, debug=False): angular diameter distance

saltshaker.util.cosmo.rsDv(z, Om=0.3, Ode=0.7, w0=-1, wa=0, H0=70, debug=False): rs / Dv : BAO constraint from Percival:2010 and Komatsu:2010 rs = sound horizon distance Dv = baryon drag epoch

saltshaker.util.cosmo.A(z, Om=0.3, Ode=0.7, w0=-1, wa=0, H0=70, debug=False): angular diameter distance with Omega_matter, from Eisenstein:2005 (see also Kessler:2009)

saltshaker.util.cosmo.R(z, Om=0.3, Ode=0.7, w0=-1, wa=0, H0=70, debug=False): The shift parameter, constrained by CMB measurments in Komatsu:2008 (see also Kessler:2009)