def omeganuh2a( a ,
Neff,
omeganuh2 = 0. ,
sigmamass = None ,
omegagammah2 = 2.471e-5 ,
method = "HACC") :
"""
returns a tuple of (omeganuh2 (a) , \dot(omeganuh2) (a)) in different
approximations specified by the string method. If sigmamass is
provided (ie. not None), the mass is assumed to be equal for each
neutrino and overrides the specified values of omeganuh2 using the
relation omeganuh2 = sigmamass /94 eV
args:
a :
Neff :
omeganuh2 :
sigmamass: optional, float, defaults to None
sum of masses of neutrinos assumed in units of eV.
method:
"""
import utils.typeutils as tu
if tu.isiterable(a) :
a = np.asarray(a)
else :
a = np.asarray([a])
if sigmamass !=None:
#mass = sigmamass /Neff
omeganuh2 = sigmamass / 94.0
#print "a ", a
#print omegagammah2
omeganumasslessh2 = Neff*omegagammah2
omeganumasslessh2 *= (7.0/8.0) *(4.0/11.0)**(4.0/3.0)/a**4.0
omeganumassiveh2a = omeganuh2 /a**3.0
if method =="HACC":
masslessval = -4.0
massiveval = -3.0
omeganuh2, res = tu.greaterarray( omeganumasslessh2 , omeganumassiveh2a,masslessval, massiveval)
#print 1./a - 1.0, masslessval , massiveval ,res , omeganuh2
dotomeganuh2 = omeganuh2 *res /a
return omeganuh2, dotomeganuh2
else:
raise ValueError("Method undefined")
def sigmaM (M , ps , bgtype = "matter", khmin = 1.0e-5 , khmax = 2.0 , logkhint = 0.005 , z = 0.0 , cosmo = None , **params): """Returns the standard deviation of the overdensity fields smoothed at a radius corresponding to mass M. args: M: array like , mandatory mass of halo in units of solar masses ps: bgtype : z = : khmin : cosmo : notes: the bgtype matters for converting Mass M to R. Also ps must be set accordingly """ if tu.isiterable(M): M = np.asarray(M) #if cosmo == None: # from astropy.cosmology import Planck13 as cosmo h = cosmo.H0/100.0 R = filterradiusformass( M , bgtype= bgtype, z = z, cosmo = cosmo) RinMpcoverh = R*h #print "RinMpcoverh ***************" #print RinMpcoverh #return RinMpcoverh return sigma( ps , R = RinMpcoverh, khmin = khmin , khmax = khmax, logkhint = logkhint , cosmo= cosmo, **params)
def sigmasq (ps , R = 8. , usenative = True, khmin = 0.9e-5 , khmax = 5.0, logkhint = 0.005 , cosmo = None, filt= filters.Wtophatkspacesq, **params) : """ Returns the variance of the overdensity field smoothed at a radius of R Mpc/h using a filter specified by filt args: ps: tuple of koverh, power spectrum values R : float array like distance scale in units of Mpc/h over which the filtering is done usenative: bool, optional , defaults to True Use values provided in ps, rather than interpolation cosmo: Model, whose hubble constant will be used khmin: float, value below which the integral will not be calculated returns : array of sigmasq values notes: - We need h, even if CAMB power spectrum is given - If interpolation is used only, and the range provided is outside the range of the data, only those points in the original range will be used. extrapolation is dangerous, particularly at high k, unless it is made to drop as a power law. """ import numpy as np import scipy.integrate as si h = cosmo.H0/100.0 if usenative : mask = ps[1] is not np.nan #khvals = ps[0][mask] khvals = ps[0] else: logkhmin = np.log(khmin) logkhmax = np.log(khmax) logkh = np.arange(logkhmin, logkhmax , logkhint) khvals = np.exp(logkh) logkhmin = max(min(ps[0]),logkhmin) logkhmax = min(max(ps[0]),logkhmax) mask = khvals >= khmin khvals = khvals[mask] k = khvals * h psinterp = np.interp (khvals , ps[0], ps[1], left = np.nan, right = np.nan) #plt.loglog(khvals, psinterp, label="interp") #plt.loglog(ps[0], ps[1], label="native") #plt.legend(loc= "best") #plt.show() if tu.isiterable(R): R = np.asarray(R) kr = np.outer( R, khvals ) else: kr = R* khvals kwinsq= filt (kr, R) #kwin = 3*(np.sin(kr)-kr*np.cos(kr))/(kr)**3 #kwinsq = kwin *kwin ksqWsqPk = k*k *kwinsq* psinterp /2. /np.pi/ np.pi/h /h/h sigmasq = si.simps ( ksqWsqPk, x = k, even = 'avg') return sigmasq
