/**
 * H(s)^2 = H_0^2 (\Omega_m s^3 + \Omega_{rad} s^4 + \Omega_\Lambda s^{3(1+w)} + \Omega_k s^2 )
 */
export interface ExpansionInputs {
    /** Upper and lower bounds for stretch, or an array of values. */
    stretch: [upper: number, lower: number] | number[];
    /** The number of steps to take between the upper and lower stretch bounds. */
    steps?: number;
    /** Stretch steps are linear by default, set this to `true` for exponential steps. */
    exponentialSteps?: boolean;
}
/**
 * A full result from an expansion calculation.
 */
export interface ExpansionResult {
    /** Stretch \\( s = z + 1 \\). */
    s: number;
    /** Scale factor \\( a = 1 / (z + 1) \\). */
    a: number;
    /** Redshift. */
    z: number;
    /** Hubble parameter \\( kms^{-1}Mpsc^{-1} \\). */
    h: number;
    /** Time (Gy). */
    t: number;
    /** Hubble radius (Gly). */
    r: number;
    /** Proper distance of a source observed at this redshift (Gly). */
    dNow: number;
    /** Proper distance at this redshift when the light was emitted (Gly). */
    d: number;
    /** Event horizon (largest proper distance that light can ever bridge) (Gly) */
    dHor: number;
    /** Particle horizon (Gly) */
    dPar: number;
    /** Recession rate of a source observed at this redshift (c = 1). */
    vNow: number;
    /** Recession rate at this redshift when the light was emitted (c = 1). */
    v: number;
    /** @todo document this! */
    vGen: number;
    /** Matter fraction of the critical energy density \\( \rho_{crit}^{-1} \\). */
    omegaM: number;
    /** Dark energy fraction of the critical density \\( \rho_{crit}^{-1} \\). */
    omegaLambda: number;
    /** Radiation density fraction of the critical density \\( \rho_{crit}^{-1} \\). */
    omegaRad: number;
    omega: number;
    temperature: number;
    /** Critical density. */
    rhoCrit: number;
}
interface IntegrationResult {
    s: number;
    t: number;
    dNow: number;
    dPar: number;
    dHor: number;
}
interface CosmicExpansionVariables {
    h: number;
    omega: number;
    omegaM: number;
    omegaLambda: number;
    omegaRad: number;
    temperature: number;
    rhoCrit: number;
}
interface CosmicExpansionModelProps {
    /** Redshift when matter and radiation densities were equal \\( z_{eq} \\). */
    zEq: number;
    /** Total density paramater \\( \Omega_{tot} \\). */
    omega0: number;
    /** Hubble constant \\( H_0 \\) (in km/s/Mpsc). */
    h0: number;
    h0Gy: number;
    /** Dark energy density parameter \\( \Omega_\Lambda \\). */
    omegaLambda0: number;
    OmegaK0: number;
    omegaM0: number;
    omegaRad0: number;
    rhoCrit0: number;
    /** Temperature of the cosmic microwave background radiation (K). */
    temperature0: number;
    /** $$ \frac{3}{8 \pi G} \approx 1.788 445 339 869 671 753 \times 10^9 $$ */
    rhoConst: number;
    /** Conversion: multiply (a Hubble factor in) km/s/Mpsc to get Gigayears. */
    kmsmpscToGyr: number;
    /** Conversion: multiply Gigayears to get seconds. */
    gyrToSeconds: number;
}
export interface CosmicExpansionModelOptions {
    survey?: 'planck2018Bao' | 'planck2018' | 'planck2015' | 'wmap2013';
    [key: string]: number | string | undefined;
}
export declare class CosmicExpansionModel {
    /** Current age of the universe for this model. */
    age: number;
    props: CosmicExpansionModelProps;
    getESquaredAtStretch: (s: number) => number;
    getVariablesAtStretch: (s: number) => CosmicExpansionVariables;
    constructor(options?: CosmicExpansionModelOptions);
    createProps(options: CosmicExpansionModelOptions): CosmicExpansionModelProps;
    /**
     * Hubble constant as a function of stretch.
     *
     * @param s stretch = 1/a, where a is the usual FLRW scale factor.
     * @returns The Hubble constant at stretch s.
     */
    createESquaredAtStretchFunction(): (s: number) => number;
    createVariablesAtStretchFunction(): (s: number) => CosmicExpansionVariables;
    getIntegralFunctions(): {
        TH: (s: number) => number;
        THs: (s: number) => number;
    };
    /**
     * Get a list of cosmic expansion results for a range of stretch values.
     *
     * @param stretchValues Points to calculate at.
     * @returns An array of integration results.
     */
    calculateExpansionForStretchValues(stretchValues: number[]): IntegrationResult[];
    createExpansionResults(integrationResults: IntegrationResult[]): ExpansionResult[];
    /**
     * Calculate the current age of the universe.
     *
     * @param inputs Inputs.
     * @returns
     */
    getAge(): number;
    /**
     * Get a list of cosmic expansion results.
     *
     * @param inputs Inputs.
     * @returns
     */
    calculateExpansion(inputs: ExpansionInputs): ExpansionResult[];
}
export declare const create: (options?: CosmicExpansionModelOptions) => CosmicExpansionModel;
export {};
//# sourceMappingURL=model.d.ts.map