3 ms·
The simulations themselves don't have zillions of parameters, but the field itself does. When you say something like "the bullet cluster blah blah" you are tal
by dnautics 6y ago
The simulations themselves don't have zillions of parameters, but the field itself does. When you say something like "the bullet cluster blah blah" you are talking about a custom parameterization of the lambda-cdm field. You're not talking about simulation, because simulations predict that bullet cluster speed collisions should not happen in our universe's lifetime with the number of galaxies observed.
- sega_sai 6y agoI'll point you here on the topic of the cluster speed https://ui.adsabs.harvard.edu/abs/2007MNRAS.380..911S/abstract https://ui.adsabs.harvard.edu/abs/2007MNRAS.380..911S/abstra... I.e. it's not a problem.
- dnautics 6y agook that's fine but it still doesn't change the fact that there is a distinction between parameterizing field vs parameterizing the simulation. You shouldn't have conflated the two in your defense of LCDM.
- raattgift 6y agoWhat exactly are you talking about with "parameterizing field" and a couple comments up and "the lambda-cdm field" (emphasis yours) ? Are you referring to the Friedmann equations? The equation of state? The half-dozen free parameters of the model itself? What's your exact objection here? Because there isn't anything that I would quickly call a "lambda-cdm field" in the standard model of cosmology any more than there is a single "standard model field" in the standard model of particle physics. "The field itself does" -- again, what exactly do you mean here? Are you even talking about a mathematical or even physical object?
- dnautics 6y agos/field/particle density map/g