file src/Inflation.cpp
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Namespaces
| Name |
|---|
| Gambit TODO: see if we can use this one: |
| Gambit::CosmoBit |
Detailed Description
Author:
- Selim C. Hotinli (selim.hotinli14@pimperial.ac.uk)
- Patrick Stoecker (stoecker@physik.rwth-aachen.de)
- Janina Renk (janina.renk@fysik.su.se)
- Sanjay Bloor (sanjay.bloor12@imperial.ac.uk)
- Sebastian Hoof (hoof@uni-goettingen.de)
- Pat Scott (pat.scott@uq.edu.au)
Date:
- 2017 Jul
- 2018 May
- 2018 Aug - Sep
- 2017 Nov
- 2018 Jan - May
- 2019 Jan, Feb, June, Nov
- 2018 June
- 2019 Mar,June
- 2019 June, Nov
- 2020 Mar
- 2018 Mar
- 2019 Jul
- 2020 Apr
CosmoBit routines relating to inflation.
Authors (add name and date if you modify):
Source code
// GAMBIT: Global and Modular BSM Inference Tool
// *********************************************
/// \file
///
/// CosmoBit routines relating to inflation.
///
/// *********************************************
///
/// Authors (add name and date if you modify):
///
/// \author Selim C. Hotinli
/// (selim.hotinli14@pimperial.ac.uk)
/// \date 2017 Jul
/// \date 2018 May
/// \date 2018 Aug - Sep
///
/// \author Patrick Stoecker
/// (stoecker@physik.rwth-aachen.de)
/// \date 2017 Nov
/// \date 2018 Jan - May
/// \date 2019 Jan, Feb, June, Nov
///
/// \author Janina Renk
/// (janina.renk@fysik.su.se)
/// \date 2018 June
/// \date 2019 Mar,June
///
/// \author Sanjay Bloor
/// (sanjay.bloor12@imperial.ac.uk)
/// \date 2019 June, Nov
///
/// \author Sebastian Hoof
/// (hoof@uni-goettingen.de)
/// \date 2020 Mar
///
/// \author Pat Scott
/// (pat.scott@uq.edu.au)
/// \date 2018 Mar
/// \date 2019 Jul
/// \date 2020 Apr
///
/// *********************************************
#include "gambit/Elements/gambit_module_headers.hpp"
#include "gambit/CosmoBit/CosmoBit_rollcall.hpp"
#include "gambit/CosmoBit/CosmoBit_types.hpp"
namespace Gambit
{
namespace CosmoBit
{
using namespace LogTags;
/// Helper function for diagnosing MultiModeCode errors
std::string multimode_error_handling(int& err)
{
std::string message = "MultiModeCode error: ";
switch(err)
{
/// > 0 = "failure; not fatal"
case 1:
message = "Inflation did not start.";
break;
case 2:
message = "The pivot scale didn't leave the horizon.";
break;
case 3:
message = "A modes' initial conditions couldn't be set consistently.";
break;
case 4:
message = "Too many e-folds; can't initialize the scale factor.";
break;
case 5:
message = "Trying to save the field values at some reference N, but got less evolution than that.";
break;
case 6:
message = "Didn't satisfy reheating bounds.";
break;
/// < 0 = "fatal"
case -1:
message = "Numerical underflow error in odeint.";
break;
// Otherwise -- who knows.
default:
message = "GAMBIT caught an unknown error in MultiModeCode. Check MultiModeCode output and error messages for more "
"info (set the 'debug' switch in 'set_multimode_inputs' to '1' if you have set it to '0').";
}
return message;
}
// Function to set the generic inputs used for MultiModeCode (MMC).
// N.B. Most of the available MMC parameters are already set by the default constructor of Multimode_inputs. These default
// values generally relate to the case of a single inflation field with instant reheating. In general, at least some of the
// parameters need to be adjusted for other models.
void set_multimode_inputs(Multimode_inputs &result)
{
using namespace Pipes::set_multimode_inputs;
// Clear anything from previous run
result = Multimode_inputs();
// Silence uncaught error messages from MMC ('0' = output, '1' = no output).
result.silence_output = runOptions->getValueOrDef<int>(0,"silence_output");
// Set pivot scale consistently with the rest of CosmoBit via capability
result.k_pivot = *Dep::k_pivot;
// Difference in k-space used when pivot-scale observables from mode equations are evaluated
result.dlnk = runOptions->getValueOrDef<double>(0.4,"dlnk");
// Set k-range and number of k-values (in log space) where the full power spectrum (PS) is evaluated
// N.B. Not used if only the parametrised PS has been requested in a scan
result.k_min = runOptions->getValueOrDef<double>(1e-6,"k_min");
result.k_max = runOptions->getValueOrDef<double>(1e+6,"k_max");
result.numsteps = runOptions->getValueOrDef<int>(100,"numsteps");
if (result.numsteps > 1000) { CosmoBit_error().raise(LOCAL_INFO, "Currently MultiModeCode supports a maximum k-array size of 1000. Please change your yaml file settings."); };
// Go through each inflation model known to GAMBIT, set the number of inflaton field, the parameters
// for the inflation potential parameters (vparams), and initial conditions.
// N.B. Available inflation potentials are defined in the MultiModeCode file modpk_potential.f90.
// If you want to study an inflation model of inflation that is not listed below, check if
// the model is available in modpk_potential.f90 or add it to that file before adding it here.
if (ModelInUse("Inflation_InstReh_1mono23"))
{
result.vparams.push_back(log10(*Param["lambda"])); // MultiModeCode uses log10 of this parameter
result.potential_choice = 5; // V(phi) = 1.5 lambda M_P^(10/3) phi^(2/3)
result.vparam_rows = 1;
}
else if (ModelInUse("Inflation_InstReh_1linear"))
{
result.vparams.push_back(log10(*Param["lambda"])); // MultiModeCode uses log10 of this parameter
result.potential_choice = 4; // V(phi) = lambda M_P^3 phi
result.vparam_rows = 1;
}
else if (ModelInUse("Inflation_InstReh_1quadratic"))
{
result.vparams.push_back(2.0*log10(*Param["m_phi"])); // MultiModeCode uses log10 of m_phi^2
result.potential_choice = 1; // V(phi) = 0.5 m^2 phi^2 = 0.5 m_phi^2 M_P^2 phi^2
result.vparam_rows = 1;
}
else if (ModelInUse("Inflation_InstReh_1quartic"))
{
result.vparams.push_back(log10(*Param["lambda"])); // MultiModeCode uses log10 of this parameter
result.potential_choice = 3; // V(phi) = 0.25 lambda phi^4
result.vparam_rows = 1;
}
else if (ModelInUse("Inflation_InstReh_1natural"))
{
// MultiModeCode uses log10 of both parameters below
result.vparams.push_back(log10(*Param["lambda"]));
result.vparams.push_back(log10(*Param["f_phi"]));
result.potential_choice = 2; // V(phi) = Lambda^4 [ 1 + cos(phi/f) ] = (lambda M_P)^4 [ 1 + cos(phi/[f_phi M_P]) ]
result.vparam_rows = 2;
}
else if (ModelInUse("Inflation_InstReh_1Starobinsky"))
{
result.vparams.push_back(pow(*Param["lambda"],4)); // MultiModeCode uses the fourth power of Lambda as a parameter
result.potential_choice = 19; // V(phi) = Lambda^4 [ 1 - exp(-sqrt(2/3) phi / M_P) ]^2 = (lambda M_P)^4 [ 1 - exp(-sqrt(2/3) phi / M_P) ]^2
result.vparam_rows = 1;
}
static bool first_run = true;
// Do some consistency check for inputs passed to MultiModeCode before the first run
if(first_run)
{
int size = result.vparams.size();
if (result.num_inflaton*result.vparam_rows != size)
{
std::ostringstream err;
err << "Error in MultiModecode settings: the number of free parameters in a inflation model";
err << " set through the vector 'vparams' has to match (num_inflaton) x (vparam_rows). In this case the ";
err << "length is " << result.vparams.size() << " and the product is " << result.num_inflaton*result.vparam_rows << " -- double check the model dependent settings in 'get_multimode_results'";
CosmoBit_error().raise(LOCAL_INFO, err.str());
}
if (result.potential_choice == -1 || result.num_inflaton == -1 || result.vparam_rows == -1)
{
std::ostringstream err;
err << "Error in MultiModecode settings: you did not set one (or more) of the parameters";
err << "'potential_choice', 'num_inflaton' or 'vparam_rows' for your inflation model. ";
err << "Double check the model dependent settings in 'get_multimode_results'";
CosmoBit_error().raise(LOCAL_INFO, err.str());
}
first_run = false;
}
}
/// Use the inputs from the MultiModeCode initialisation function to compute
/// a non-parametric primordial power spectrum.
void get_multimode_primordial_ps(Primordial_ps &result)
{
using namespace Pipes::get_multimode_primordial_ps;
// Clear it all
result = Primordial_ps();
// Get the inflationary inputs
Multimode_inputs inputs = *Dep::multimode_input_parameters;
// The parameters below are only used by MultiModeCode if the full power spectrum is requested.
int steps = inputs.numsteps;
double kmin = inputs.k_min;
double kmax = inputs.k_max;
gambit_inflation_observables observables;
//-------------------------------------------------------------
// The function below calls the MultiModeCode backend
// for a given choice of inflationary model,
// which calculates the observables.
//-------------------------------------------------------------
try
{
observables = BEreq::multimodecode_primordial_ps(inputs.num_inflaton,
inputs.potential_choice,
inputs.evaluate_modes,
inputs.get_runningofrunning,
byVal(&inputs.phi_init0[0]),
byVal(&inputs.dphi_init0[0]),
byVal(&inputs.vparams[0]),
inputs.N_pivot,
inputs.k_pivot,
inputs.dlnk,
steps,
kmin,
kmax,
inputs.vparam_rows,
inputs.slowroll_infl_end,
inputs.instreheat,
inputs.use_deltaN_SR,
inputs.use_horiz_cross_approx);
}
catch(std::runtime_error &e)
{
logger() << e.what() << EOM;
invalid_point().raise(e.what());
}
// If there's an error, pass it to the helper function and invalidate the point.
if(observables.err != 0)
{
std::string message = multimode_error_handling(observables.err);
logger() << message << EOM;
invalid_point().raise(message);
}
// Fill up the GAMBIT primordial power spectrum object from the outputs.
result.set_N_pivot(observables.N_pivot);
result.fill_k(observables.k_array, inputs.numsteps);
result.fill_P_s(observables.pks_array, inputs.numsteps);
result.fill_P_s_iso(observables.pks_array_iso, inputs.numsteps);
result.fill_P_t(observables.pkt_array, inputs.numsteps);
}
/// Use the inputs from the MultiModeCode initialisation function to compute
/// a parametrised primordial power spectrum.
void get_multimode_parametrised_ps(ModelParameters &result)
{
using namespace Pipes::get_multimode_parametrised_ps;
gambit_inflation_observables observables;
// Set up this ModelParameters object on first run
static bool first = true;
if (first)
{
result.setModelName("PowerLaw_ps");
result._definePars({"ln10A_s","n_s","r","N_pivot"});
first = false;
}
// Get the inflationary inputs
Multimode_inputs inputs = *Dep::multimode_input_parameters;
//-------------------------------------------------------------
// The function below calls the MultiModeCode backend
// for a given choice of inflationary model,
// which calculates the observables.
//-------------------------------------------------------------
try
{
observables = BEreq::multimodecode_parametrised_ps(inputs.num_inflaton,
inputs.potential_choice,
inputs.evaluate_modes,
inputs.get_runningofrunning,
byVal(&inputs.phi_init0[0]),
byVal(&inputs.dphi_init0[0]),
byVal(&inputs.vparams[0]),
inputs.N_pivot,
inputs.k_pivot,
inputs.dlnk,
inputs.vparam_rows,
inputs.slowroll_infl_end,
inputs.instreheat,
inputs.use_deltaN_SR,
inputs.use_horiz_cross_approx);
}
catch(std::runtime_error &e)
{
logger() << e.what() << EOM;
invalid_point().raise(e.what());
}
// If there's an error, pass it to the helper function and invalidate the point.
if(observables.err != 0)
{
std::string message = multimode_error_handling(observables.err);
logger() << message << EOM;
invalid_point().raise(message);
}
// Set the parameters of the PowerLaw_ps model from the outputs.
result.setValue("N_pivot", observables.N_pivot);
result.setValue("n_s", observables.ns);
result.setValue("ln10A_s", 10. * log(10.) + log(observables.As) );
result.setValue("r", observables.r);
}
} // namespace CosmoBit
} // namespace Gambit
Updated on 2024-07-18 at 13:53:34 +0000