stephaneww
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Need help with density parameters of the LambdaCDM model
stephaneww replied to stephaneww's topic in Astronomy and Cosmology
Thank you for everything, Mordred. If we assume, for example, that [latex]M_b * \Lambda= cst[/latex] then, when [latex]M_b[/latex] decreases [latex] \Lambda[/latex] increases inversely proportional. Could this be a part of the explanation for the fact that it seems that the acceleration of expansion is also accelerated? 
Need help with density parameters of the LambdaCDM model
stephaneww replied to stephaneww's topic in Astronomy and Cosmology
merge then edit too late : Can we say that [latex]M_\text{b(t1)} = M_\text{b(t)}[/latex] from close to close ? 
Need help with density parameters of the LambdaCDM model
stephaneww replied to stephaneww's topic in Astronomy and Cosmology
\textif I understand correctly (because I didn't understand everything) for z=0.791, doing [latex]\Omega_b=M_b/M_{total}[/latex] is not a good approximation ? well, I redid the table with the same values but with 100 steps The difference [latex]\Omega_b / \Omega_m[/latex] for z=0 et z=0.124 becomes minor : 0.05% Can we say that [latex] M_b_\text{(t1)}/ M_b_text{(t)}[/latex] from close to close ? 
Need help with density parameters of the LambdaCDM model
stephaneww replied to stephaneww's topic in Astronomy and Cosmology
for z=0.791, I used Ned Wright's calculator to determine radius of observable universe, then I find the volume, then I find total mass with the density of your table. I assume that [latex]M_b[/latex] don't change edit : of course 
Need help with density parameters of the LambdaCDM model
stephaneww replied to stephaneww's topic in Astronomy and Cosmology
In abstract [latex]\Omega_b h^2=0.0224[/latex] so : [latex]\Omega_b =0.0224/h^2=0.0224/(67.4/100)^2[/latex] 
Need help with density parameters of the LambdaCDM model
stephaneww replied to stephaneww's topic in Astronomy and Cosmology
with : http://www.einsteinstheoryofrelativity4engineers.com/LightCone720171/LightCone_Ho7.html (base Planck 2015) and : H : 67.4 Omega L : 6851 Step : 20 I have : [latex]{\scriptsize\begin{array}{rrrrrrrrrrrrrrrr} \hline z&Sc.fctr (a)&S&T (Gy)&D_{hor}(Gly)&H(t)&rho, kg/m^3&Temp(K)&OmegaM&OmegaL&OmegaR \\ \hline 1090.000&0.000917&1091.000&0.000370&0.0567&1.5678e+6&5.1243e18&2.9784e+3&7.5549e1&1.2661e9&2.4451e1\\ \hline 608.078&0.001642&609.078&0.000972&0.1009&6.1767e+5&7.9532e19&1.6628e+3&8.4697e1&8.1576e9&1.5303e1\\ \hline 339.033&0.002941&340.033&0.002479&0.1787&2.4879e+5&1.2903e19&9.2829e+2&9.0838e1&5.0282e8&9.1628e2\\ \hline 188.832&0.005268&189.832&0.006188&0.3153&1.0166e+5&2.1542e20&5.1824e+2&9.4669e1&3.0117e7&5.3311e2\\ \hline 104.978&0.009436&105.978&0.015217&0.5530&4.1901e+4&3.6600e21&2.8932e+2&9.6952e1&1.7726e6&3.0480e2\\ \hline 58.165&0.016902&59.165&0.037051&0.9621&1.7360e+4&6.2827e22&1.6152e+2&9.8275e1&1.0327e5&1.7248e2\\ \hline 32.030&0.030275&33.030&0.089654&1.6549&7.2141e+3&1.0849e22&9.0173e+1&9.9024e1&5.9802e5&9.7027e3\\ \hline 17.440&0.054230&18.440&0.216104&2.7998&3.0032e+3&1.8801e23&5.0341e+1&9.9422e1&3.4507e4&5.4386e3\\ \hline 9.295&0.097139&10.295&0.519591&4.6201&1.2522e+3&3.2689e24&2.8104e+1&9.9498e1&1.9847e3&3.0385e3\\ \hline 4.747&0.173998&5.747&1.245974&7.3303&5.2445e+2&5.7338e25&1.5690e+1&9.8701e1&1.1315e2&1.6828e3\\ \hline 2.209&0.311671&3.209&2.963870&10.8922&2.2448e+2&1.0505e25&8.7592e+0&9.3735e1&6.1759e2&8.9217e4\\ \hline 0.791&0.558275&1.791&6.796199&14.4931&1.0647e+2&2.3631e26&4.8901e+0&7.2506e1&2.7455e1&3.8527e4\\ \hline 0.000&1.000000&1.000&13.795986&16.6666&6.7400e+1&9.4701e27&2.7300e+0&3.1480e1&6.8509e1&9.3386e5\\ \hline 0.442&1.791233&0.558&23.084440&17.3355&5.7975e+1&7.0067e27&1.5241e+0&7.4032e2&9.2595e1&1.2261e5\\ \hline 0.662&2.961475&0.338&31.723059&17.4497&5.6279e+1&6.6028e27&9.2184e1&1.7384e2&9.8260e1&1.7413e6\\ \hline 0.796&4.896255&0.204&40.497135&17.4966&5.5897e+1&6.5133e27&5.5757e1&3.8994e3&9.9610e1&2.3625e7\\ \hline 0.876&8.095059&0.124&49.302428&17.5231&5.5812e+1&6.4936e27&3.3724e1&8.6547e4&9.9913e1&3.1715e8\\ \hline 0.925&13.383695&0.075&58.114641&17.5290&5.5793e+1&6.4893e27&2.0398e1&1.9163e4&9.9979e1&4.2475e9\\ \hline 0.955&22.127483&0.045&66.928214&17.5304&5.5789e+1&6.4882e27&1.2338e1&4.2410e5&9.9995e1&5.6857e10\\ \hline 0.973&36.583733&0.027&75.742301&17.5306&5.5788e+1&6.4880e27&7.4623e2&9.3846e6&9.9998e1&7.6097e11\\ \hline 0.983&60.484488&0.017&84.556288&17.5308&5.5788e+1&6.4879e27&4.5136e2&2.0766e6&1.0000e+0&1.0185e11\\ \hline 0.990&100.000000&0.010&93.370467&17.5307&5.5788e+1&6.4880e27&2.7300e2&4.5950e7&9.9999e1&1.3631e12\\ \hline \end{array}}[/latex] according to the abstract Planck 2018, [latex]\Omega_b = 0.0492[/latex] and I find [latex]M_b = 1.457*10^{53}kg[/latex] and [latex]\Omega_b / \Omega_m = 0.1563[/latex] for the present time. For z=0.791 I have a problem determining [latex]\Omega_b[/latex] or it's: [latex]M_b/M_{total} = 1.457*10^{53}kg/7.559*10^{53}kg=0.1927=\Omega_b[/latex] but then [latex]\Omega_b / \Omega_m = 0.2658[/latex]. why [latex]\Omega_b / \Omega_m[/latex] are différents for each time 
Need help with density parameters of the LambdaCDM model
stephaneww replied to stephaneww's topic in Astronomy and Cosmology
Hello Mordred. I finally understood the use of the calculator (Planck 2015) and the equality of H with density parameters. But I have not been able to find satisfactory approximations to apply them to the data in the abstract Planck 2018. I have to wait for the update to go further. I will move on to the FLRW and GR equations in the meantime. PS: I found the button output in Latex and would know how to transform Tex into Latex edit : I have find a good approximation but I have a big problem 
Need help with density parameters of the LambdaCDM model
stephaneww replied to stephaneww's topic in Astronomy and Cosmology
oh good. it's very good link when I look with options. I use it now before the 2018 planck version +1 thank you 
Need help with density parameters of the LambdaCDM model
stephaneww replied to stephaneww's topic in Astronomy and Cosmology
For the moment, I'm troubled with the equations of state Thanks for these encouragements... but I think I'm doing a little better in cosmology than in FRW: _) If you have an answer for its current value (planck 2018) I take 
Need help with density parameters of the LambdaCDM model
stephaneww replied to stephaneww's topic in Astronomy and Cosmology
oh thank you. edit ok forgot this question : [latex] \Omega_m[/latex] is for baryonic matter or all the matter (dark+ordinary)? I have a new one : where can I find [latex] \Omega_r[/latex] ? 
Need help with density parameters of the LambdaCDM model
stephaneww replied to stephaneww's topic in Astronomy and Cosmology
I also need need the ratio H/H0 to find OmegaLambda and OmegaM 
Need help with density parameters of the LambdaCDM model
stephaneww replied to stephaneww's topic in Astronomy and Cosmology
It's okay with: T H0 : 14,497 T H infinite : 17.51 Omega tot : 0.9989 there's just one tiny little mistake on OmegaM 
Need help with density parameters of the LambdaCDM model
stephaneww replied to stephaneww's topic in Astronomy and Cosmology
I'm stranded: how to get the values with Planck 2018 please? for : http://www.einsteinstheoryofrelativity4engineers.com/LightCone7/LightCone.html edit I understood : Hubble time is different from age of unoverse 
Need help with density parameters of the LambdaCDM model
stephaneww replied to stephaneww's topic in Astronomy and Cosmology
Perfect. thank you again. After reading the table of contents and the passage concerning the cosmological parameters, I did not find it. Or else I don't understand. I have a formula that will go into the speculation section with [latex]\Omega_b[/latex] and [latex]\Omega_\Lambda[/latex] that could be compatible with this: https://www.scienceforums.net/topic/117894darkenergyincreasingwithtime/ I'll calculate to see if the numerical values confirm Thank you again 
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