quantum gravity - Physical Significance of the Planck Density
2015年4月15日 · Planck's density can also be interpreted as the matter density for which the spacetime torsion field induced by fermions fields becomes important, in General Relativity (or more precisely under the Einstein-Cartan-Sciama-Kibble theory). At Planck's density, torsion should kick-in, even in classical General Relativity.
event horizon - What is exactly the density of a black hole and …
2015年11月16日 · It is likely that you can pack no more than about one Planck mass into each Planck volume, i.e. cubic Planck length. This works out to 5.1555e96 kg/m^3. This works out to 5.1555e96 kg/m^3. The implication of this calculation is that all black holes will have roughly the same density, and will simply increase in real volume with increasing mass.
The strange thing about the maximum in Planck's law
For a mass density $\rho$ you have a mass per unit volume, and the density can vary from place to place, so to get the total mass you break up space into a bunch of little volumes, each of which has density constant to within some tolerance, then you take that density and that volume and multiply them together to get the mass of that piece, and ...
Singularities, Density, and the Planck Length - Physics Forums
2011年4月9日 · FAQ: Singularities, Density, and the Planck Length What is a singularity? A singularity is a point of infinite density and zero volume that is predicted by some theories of physics, such as Einstein's theory of general relativity. It is thought to exist at the center of black holes and at the beginning of the universe.
dimensional analysis - What is the significance of Planck units ...
2020年12月30日 · People talk about things like “spacetime foam” or “spacetime quanta” at (around) the Planck length and time scales, string-theory particles with masses at (around) the Planck mass or higher, possible unification of all forces at (around) the Planck energy, black holes containing Planck stars having (around) the Planck density, and the like.
Planck formula and density of photons - Physics Forums
2016年7月13日 · The Planck formula, also known as Planck's law, is an equation that describes the spectral energy density of blackbody radiation. It was developed by German physicist Max Planck in 1900 and is considered one of the fundamental equations in quantum mechanics.
FLRW: GR meets QM, coincidence or deeper connection?
2024年11月25日 · If I take the intial density $\rm \rho_{\Lambda}$ to be the Planck density, I also get one Planck length as the maximal initial distance between two points in the beginning when $\rm H=0$, where the maximal distance in such a closed universe would be the half curvature circumference $\rm r_k \pi $ with the curvature radius $\rm r_k=1/\sqrt{k ...
Is the Planck Density a Hopelessly Outdated View? - Physics Forums
2010年9月2日 · The Planck Density, also known as the Planck energy density or Planck mass density, is the maximum possible energy density that can exist in the universe according to the laws of quantum physics. It is a fundamental constant and has a value of approximately 5.16 x 10^96 kilograms per cubic meter.
Density function with Planck's law - Physics Stack Exchange
2023年4月22日 · If you want to get energy out of that expression of Planck's law, you need to integrate it with respect to wavelength over some finite change in wavelength to get Radiance over that wavelength range. Then integrate the Radiance with respect to solid angle over some finite change in solid angle (probably zero to the relevant measured solid angle ...
Exploring the Mystery of the Planck Mass: Why is it So Big?
2005年8月6日 · ok, Planck mass density is another story, but the original question was of Planck mass, and I did say that it was very small, but I was thinking about the Planck length when I said that. In reference to particle physics yes, the Planck mass is large, but in the grand scheme of things its very small.