cosmology 0.3.2

An early-in-development crate aiming to provide a lot of utilities commonly used in cosmology.
Documentation 
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use transfer::eisenstein::*;

pub mod growth_factor;
pub mod transfer;

#[derive(Clone)]
pub struct PowerSpectrum(TransferFunctionEngine);

pub enum TransferFunction {
    EisensteinHu {
        h: f64,
        omega_matter_0: f64,
        omega_baryon_0: f64,
        temp_cmb0: f64,
        ns: f64,
        sigma_8: f64,
    },
    EisensteinHuNoBaryon {
        h: f64,
        omega_matter_0: f64,
        omega_baryon_0: f64,
        temp_cmb0: f64,
        ns: f64,
        sigma_8: f64,
    },
}

#[derive(Clone)]
enum TransferFunctionEngine {
    EisensteinHu(EisensteinHu),
    EisensteinHuNoBaryon(EisensteinHu),
}

pub enum PowerFn<'a> {
    EisensteinHu(EisenHuPackage<'a>),
    EisensteinHuNoBaryon(EisenHuPackage<'a>),
}

impl PowerSpectrum {
    pub fn new(transfer: TransferFunction) -> Result<Self, &'static str> {
        match transfer {
            // Eistenstein & Hu 1998
            TransferFunction::EisensteinHu {
                h,
                omega_matter_0,
                omega_baryon_0,
                temp_cmb0,
                ns,
                sigma_8,
            } => Ok(PowerSpectrum(TransferFunctionEngine::EisensteinHu(
                EisensteinHu::new(h, omega_matter_0, omega_baryon_0, temp_cmb0, ns, sigma_8)?,
            ))),

            // Eistenstein & Hu 1998 (zero baryon, i.e. no BAO)
            // This uses the same underlying engine as EisensteinHu variant, but calls different methods.
            TransferFunction::EisensteinHuNoBaryon {
                h,
                omega_matter_0,
                omega_baryon_0,
                temp_cmb0,
                ns,
                sigma_8,
            } => Ok(PowerSpectrum(TransferFunctionEngine::EisensteinHuNoBaryon(
                EisensteinHu::new(h, omega_matter_0, omega_baryon_0, temp_cmb0, ns, sigma_8)?,
            ))),
        }
    }

    pub fn calculate_power(
        &self,
        ks: &[f64],
        z: f64,
    ) -> Result<Vec<f64>, Box<dyn std::error::Error>> {
        match &self.0 {
            // Eistenstein & Hu 1998
            TransferFunctionEngine::EisensteinHu(e_hu_engine) => e_hu_engine.power_z(ks, z),

            // Eistenstein & Hu 1998 (zero baryon, i.e. no BAO)
            TransferFunctionEngine::EisensteinHuNoBaryon(e_hu_engine) => {
                e_hu_engine.power_z_zero_baryon(ks, z)
            }
        }
    }

    pub fn power_fn(&self, z: f64) -> Result<PowerFn, Box<dyn std::error::Error>> {
        match &self.0 {
            // Eistenstein & Hu 1998
            TransferFunctionEngine::EisensteinHu(e_hu_engine) => e_hu_engine
                .power_z_at_k_packaged(z)
                .map(PowerFn::EisensteinHu),

            // Eistenstein & Hu 1998 (zero baryon, i.e. no BAO)
            TransferFunctionEngine::EisensteinHuNoBaryon(e_hu_engine) => e_hu_engine
                .power_z_at_k_packaged_zb(z)
                .map(PowerFn::EisensteinHuNoBaryon),
        }
    }
}

impl<'a> PowerFn<'a> {
    pub(crate) fn power(&self, k: f64) -> f64 {
        match self {
            PowerFn::EisensteinHu(pkg) => pkg.power_at_k(k),
            PowerFn::EisensteinHuNoBaryon(pkg) => pkg.power_at_k(k),
        }
    }
}

#[cfg(test)]
mod tests {

    use super::*;

    #[test]
    fn test_create_power_spectrum() {
        let _ = PowerSpectrum::new(TransferFunction::EisensteinHu {
            h: 0.7,
            omega_matter_0: 0.3,
            omega_baryon_0: 0.02,
            temp_cmb0: 2.7,
            ns: 1.0,
            sigma_8: 0.06,
        });
    }
}