astronomy Cosmology Creation/evolution Physics

Why look for a new theory of gravity if the big bang cosmology is correct?

Occasionally we read in the popular press, especially online, that someone has come up with a new theory of gravity. Why is that even necessary if the current theory describing the evolution of the universe is so correct?

The standard ΛCDM big bang cosmology is derived from an application of certain non-biblical boundary conditions to the physics of Einstein’s general relativity theory. But when that was applied to the universe as a whole, two problems developed for the secular model. One is the need to add in dark energy (or the cosmological constant, Λ (Lambda), to Einstein’s field equations) and the other is the need for a significant amount of invisible cold dark matter (CDM).

On the scale of galaxies and even clusters of galaxies Newtonian physics is used as it is the low gravity limit of general relativity. But without the addition of dark matter the resulting theory, using the known density of visible matter in galaxies (see Fig. 1) and clusters, does not match observations. But for more than 40 years now dark matter has been sought in various lab experiments with consistently negative results. This has developed into what is called the dark matter crisis.1

Figure 1: Typical rotation curve of a spiral galaxy: Speeds (V) in km/s units as a function of distance from the centre of the galaxy (R) in 1000 light-year (ly) units. The upper curve shows the speeds of the stars in disk region determined from their visible light and the gasses beyond that determined from radio frequency emissions. The lower curve shows what standard Newtonian physics predicts should be observed. The discrepancy is made up by positing the existence of invisible dark matter. Credit: Wikipedia

Occasionally a claim is made that a theorist has some inkling of what dark matter particles might be but the crisis remains.2 Dark matter particles have been sought without success in the Galaxy using very sensitive detectors deep in underground mines,3 or with the Large Hadron Collider (LHC) over 10 years of experiments looking for the lowest mass stable particle in a theorised class of as-yet-undiscovered supersymmetric particles.4

The observational data from thousands of galaxies together with the negative outcome of all the experiments searching for Dark Matter particles indicate that either something is wrong with the physics we use or that the expected dark matter is much more elusive than supposed, or, indeed, does not, in fact, exist—which gets us back to something being wrong with the physics.

Belief in God Cosmology Creation/evolution Physics

Does Dark Matter matter?

Cosmology and astrophysics nowadays is dominated by the need for the inclusion of Dark Matter at every scale, from galaxy size, to cluster size, to super-cluster size, to the size of the whole Universe. It is needed at every scale size to get the physics to agree with the observational data. After 50 years of looking in local laboratory experiments there has not been a single trace of it found anywhere. And it would not be overstating the case to say Dark Matter is in serious crisis!

dm-livesThis situation reminds me of a current political trend in America, that is, “Black Lives Matter”, which has turned into a major movement. The proponents of it, describe it as a response to virulent anti-Black racism that they claim permeates the US society.

With that in mind, and in response to a discussion on Dark Matter, a friend sent me this graphic (see Fig. 1), quite obviously as a joke. It is funny but on another level it highlights a problem in the cosmology/ astrophysics society that is not so funny. The problem is that the majority are saying “Dark Matter Lives”. And they are saying that despite the actual experimental evidence to the contrary. In their minds it only “lives” because without it the standard paradigm is “dead”.

Big bang cosmology and the dynamics of galaxies and clusters of galaxies require that “Dark Matter Lives”. Those who voice the obvious fact that Dark Matter is not real, or, should I say, is “dead”, are sidelined or ridiculed. The secular physics community hold that those who express such opinions are expressing a sort of anti-science bias because it ultimately involves a rejection of the big bang paradigm.

Recently the Dark Matter crisis has deepened even more. The admission by a group of theoretical physicists that the physics theory called supersymmetry (SUSY) has been all but disproven by 10 years of experimental searching with the Large Hadron Collider (LHC) has made matter worse.1  That meant one of the last hopes of a dark matter particle was the expected lowest mass supersymmetric particle, which has not been detected. Other searches for dark matter particles among neutrinos have also not been successful. After 50 years of searching no Dark Matter has ever been found. It existence is purely a matter of faith.