Enrique Arribas-Garde#SpeedOfLight The Lambda-Cold Dark Matter (Lambda-CDM) model fits the cosmological data perfectly, including the results obtained with the Cosmic Microwave Background (CMB) model.
#SpeedOfLight According to the Lambda-Cold Dark Matter (Lambda-CDM) model, dark matter is something cold and invisible that only shows up, indirectly, through its gravitational effects. #physics
#SpeedOfLight Dark energy, according to the Lambda-cold dark matter (Lambda-CDM) model, is a property of empty space, which in other models is called the cosmological constant and is represented by lambda. #physics
#SpeedOfLight As the universe grew in size, the push of dark energy was greater than the pull of gravity, so after slowing down, the expansion of the universe is now clearly accelerating. #physics
#SpeedOfLight The dark matter appears to have accumulated in certain areas. Billions of years later, ordinary matter began to form galaxies in regions where dark matter was predominant. First-ever image of dark matter? #physics
#SpeedOfLight The universe grew exponentially in the first moments of the Big Bang, producing small quantum fluctuations in the dense soup of fundamental particles in which it found itself at that time. #physics
HaraldGiven the metric tensor g_ij, with i and j being 0, 1, 2 or 3 at a given point in space. We also have a fixed three dimensional unit vector e^i with i being 1, 2 or 3. Using Einstein Notation define
\alpha = (1/g_{ij} e^i e^j) \left( \sqrt{ (g_{0i} e^i)^2 - g_{00}} - g_0i e^i \right)
Can we show that alpha is invariant under coordinate transformation. I asked an AI, said "yes". But????
Why should this be possible? See here: https://blog.miamao.de/blog/Speed_of_Light_from_Metric.html
#SpeedOfLight We believe that the universe currently contains 5% ordinary matter, 27% invisible dark matter (which holds galaxies together), and 68% dark energy (which tightens and stretches space like air in a bubble). #physics
#SpeedOfLight Astrophysicists are confident that solving the Hubble tension could help cosmologists better understand the composition and evolution of the universe. There are also more skeptical opinions. #physics
#SpeedOfLight These artifacts may be fading away, or they may be telling us that the Hubble tension puzzle may have a simple physical solution.
