“The big bang model, perhaps not quite well-established”

This article is taken from Les Indispensables de Sciences et Avenir #209 April/June 2022.

Thomas Lepeltier is a PhD in astrophysics and a researcher in the history and philosophy of science.

Sciences et Avenir: The model for the birth of the universe, known as the Big Bang, is experiencing “stresses” – a euphemism for its flaws. Who are they ?

Thomas Lepeltier: Together with astrophysicist Jean-Marc Bonnet-Bidot, we analyzed about ten such stressful situations, which is preferable to the term “default”, since the latter implies an internal problem. However, it is currently impossible to know whether the anomalies encountered by the Big Bang model are only temporary or, conversely, reflect a fundamental problem. This ranges from mysterious dark matter and dark energy, the nature of which astrophysicists cannot determine or even guarantee the existence of, and which, making up 95% of the energy of the Universe, were necessarily active at its birth, to disagreements over the magnitude of the rate of expansion of space, to the complexity of explaining the imbalance between matter and antimatter when the big bang model predicts equal creation. All these problems may prompt cosmologists not to declare the Standard Model fully established.

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