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Barboza-Alcaniz dark energy model #477

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Barboza-Alcaniz dark energy model #477

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4673389
merge last 2 commit. Redshift squared model
pasq-cat Mar 22, 2022
645893c
Merge branch 'lesgourg:master' into dev_branch
pasq-cat Apr 6, 2022
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2 changes: 1 addition & 1 deletion include/background.h
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,7 @@ enum spatial_curvature {flat,open,closed};

/** list of possible parametrisations of the DE equation of state */

enum equation_of_state {CLP,EDE};
enum equation_of_state {CLP,EDE,SRS};


/** list of possible parametrizations of the varying fundamental constants */
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82 changes: 0 additions & 82 deletions output/explanatory00_parameters.ini
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9 changes: 9 additions & 0 deletions source/background.c
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Expand Up @@ -679,6 +679,9 @@ int background_w_fld(
case CLP:
*w_fld = pba->w0_fld + pba->wa_fld * (1. - a);
break;
case SRS:
*w_fld = ( pba->w0_fld -2*a*pba->w0_fld+ 2*a*a*pba->w0_fld + pba->wa_fld -a*pba->wa_fld ) /( 1.-2*a+2*a*a );
break;
case EDE:
// Omega_ede(a) taken from eq. (10) in 1706.00730
Omega_ede = (pba->Omega0_fld - pba->Omega_EDE*(1.-pow(a,-3.*pba->w0_fld)))
Expand Down Expand Up @@ -714,6 +717,9 @@ int background_w_fld(
case CLP:
*dw_over_da_fld = - pba->wa_fld;
break;
case SRS:
*dw_over_da_fld = ((1.-4*a+2*a*a)*pba->wa_fld)/((1.-2*a +2*a*a)*(1.-2*a +2*a*a));
break;
case EDE:
d2Omega_ede_over_da2 = 0.;
*dw_over_da_fld = - d2Omega_ede_over_da2*a/3./(1.-Omega_ede)/Omega_ede
Expand All @@ -740,6 +746,9 @@ int background_w_fld(
case EDE:
class_stop(pba->error_message,"EDE implementation not finished: to finish it, read the comments in background.c just before this line\n");
break;
case SRS:
*integral_fld =( 3./2. )*( -2*(1+pba->wa_fld+ pba->w0_fld ) *log (a) + pba->wa_fld*log( 1-2*a +2*a*a ) );
break;
}

/** note: of course you can generalise these formulas to anything,
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10 changes: 10 additions & 0 deletions source/input.c
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Expand Up @@ -3231,6 +3231,9 @@ int input_read_parameters_species(struct file_content * pfc,
if ((strstr(string1,"CLP") != NULL) || (strstr(string1,"clp") != NULL)) {
pba->fluid_equation_of_state = CLP;
}
else if ((strstr(string1,"SRS") != NULL) || (strstr(string1,"srs") != NULL)) {
pba->fluid_equation_of_state = SRS;
}
else if ((strstr(string1,"EDE") != NULL) || (strstr(string1,"ede") != NULL)) {
pba->fluid_equation_of_state = EDE;
}
Expand All @@ -3246,6 +3249,13 @@ int input_read_parameters_species(struct file_content * pfc,
class_read_double("wa_fld",pba->wa_fld);
class_read_double("cs2_fld",pba->cs2_fld);
}
if (pba->fluid_equation_of_state == SRS) {
/** 8.a.2.2) Equation of state of the fluid in 'LRS' case */
/* Read */
class_read_double("w0_fld",pba->w0_fld);
class_read_double("wa_fld",pba->wa_fld);
class_read_double("cs2_fld",pba->cs2_fld);
}
if (pba->fluid_equation_of_state == EDE) {
/** 8.a.2.3) Equation of state of the fluid in 'EDE' case */
/* Read */
Expand Down