Recent content by darkdark10

You casually dismiss years of someone else's insight simply by labeling it AI-generated. I'm holding back because this is a strictly moderated forum. 1. Because a lot of people made a ridiculous fuss about applying R_S (a physical quantity commonly associated with black holes) to the observable...

1.Modern gravitational physics has fundamental problems, including 1)the Planck-scale divergence problem, 2)the black hole singularity problem, 3)the inflation problem, and 4)the dark energy problem. The continuous appearance of these anomalous phenomena suggests that an important element is...

Now we have a particle-antiparticle asymmetry problem. But, if we define electron and neutrino as antiparticle, will there be a problem? Original formula Modified formula Original formula Modified formula If the classification of electron and neutrino is changed to antiparticles, the...

Your argument( ) leads to: \rho + \frac{{3P}}{{{c^2}}} = {\rho _{rad}} + \frac{{3(\frac{1}{3}{\rho _{rad}}{c^2})}}{{{c^2}}} = 2{\rho _{rad}} Your argument leads to the claim that when matter and radiation have the same energy density ρ0, the radiation exerts twice the gravitational force than...

We know that mass density = energy density/c^2. The question is, when entering the expression (ρ+3P/c^2), which form is correct? When looking at the radiation term, \rho + \frac{{3P}}{{{c^2}}} = {\rho _{rad}} + \frac{{3(\frac{1}{3}{\rho _{rad}}{c^2})}}{{{c^2}}} = 2{\rho _{rad}} or \rho +...

\frac{1}{R}\frac{{{d^2}R}}{{d{t^2}}} = - \frac{{4\pi G}}{3}\left[ {{\rho _m} + {\rho _{rad}} + {\rho _\Lambda } + \frac{{3({P_m} + {P_{rad}} + {P_\Lambda })}}{{{c^2}}}} \right] In the Friedmann equation, ρ is the mass density. === https://en.wikipedia.org/wiki/Friedmann_equations They were...

In the book(An Introduction to Modern Astrophysics - Bradley W. Carroll and Dale A.Ostile) Pressure P = equivalent energy density of kinetic energy P/c^2 = equivalent mass density of kinetic energy Isn't the pressure P in the acceleration equation the equivalent energy density of kinetic energy?

Currently, dark energy is described as a being that exerts a negative pressure while having a positive energy density. {\rho _\Lambda } + 3{P_\Lambda } = {\rho _\Lambda } + 3( - {\rho _\Lambda }) = - 2{\rho _\Lambda } However, there seems to be a problem with the negative pressure assertion...