The Big Bang theory is very dependent on the observation and interpretation of the Cosmic Microwave Background (CMB) radiation. In the Big Bang theory the CMB originated from a process called recombination. We know that it is not possible to create the early conditions of the Big Bang in a laboratory environment. However, under the Big Bang theory the universe has cooled to 3000 degrees Kelvin by a time 370,000 years after the Big Bang. This temperature is within the possible range of temperatures which is accessible in a laboratory environment.

The hypothesis of the Big Bang is that the CMB radiation is coming from a time 13.8 billion years ago when the universe became transparent due to recombination (see below). Before then the universe was opaque to radiation.

It is clear from the narrative of the theory that the figure of 3000 degrees Kelvin comes from the temperature required to produce the current CMB observed temperature of around 2.725 degrees Kelvin after a redshift of 1100. The temperature has not been derived from an analysis of the properties of a plasma.

Now that we have the ability to verify the hypothesis of recombination, for example by observation of the behaviour of a plasma as the temperature drops through 3000 degrees Kelvin, it would be worthwhile to perform this experiment.

As a scientific experiment it is well justified economically since if the analysis shows that a plasma does not behave exactly in the way predicted for the CMB in the Big Bang model then there would be considerable savings in scientific research investment which is predicated on the hypothesis of the Big Bang theory lambda CDM model.

So my conclusion is that the Big Bang theory is falsifiable.

Recombination is described in Wikipedia as:

https://en.wikipedia.org/wiki/Recombination_(cosmology)

In cosmology, recombination refers to the epoch at which charged electrons and protons first became bound to form electrically neutral hydrogen atoms. Recombination occurred about 370,000 years after the Big Bang (at a redshift of z = 1100). The word "recombination" is misleading, since the Big Bang theory doesn't posit that protons and electrons had been combined before, but the name exists for historical reasons since it was named before the Big Bang hypothesis became the primary theory of the creation of the universe.

. . . .

This production of photons is known as decoupling, which leads to recombination sometimes being called photon decoupling, but recombination and photon decoupling are distinct events. Once photons decoupled from matter, they traveled freely through the universe without interacting with matter and constitute what is observed today as cosmic microwave background radiation (in that sense, the cosmic background radiation is infrared [and some red] black-body radiation emitted when the universe was at a temperature of some 3000 K, redshifted by a factor of 1100 from the visible spectrum to the microwave spectrum).

Richard

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