The Man Who Corrected Einstein

TL;DR

Albert Einstein made a critical mathematical mistake that initially hindered his understanding of the expanding universe.

Transcript

In the late 19-teens, Albert Einstein had a new hammer, and he was in search of nails to hit. He had just developed a new and more powerful mathematical description of gravity , and was using it to make predictions willy-nilly. First, Einstein checked that his new description matched up with the previous state-of-the-art description of gravity, new... Read More

Key Insights

• 🙂 Albert Einstein's new mathematical description of gravity made accurate predictions about various phenomena, including the bending of starlight and the redshift of light.
• 🥺 Einstein's mistaken calculation led him to believe the universe was static, which conflicted with growing evidence of its expansion.
• ❓ Alexander Friedmann corrected Einstein's mistake and demonstrated through his equations that the universe could be expanding, contracting, or static.
• 📞 Einstein's bias and belief in a static universe hindered his realization of the expanding universe until he received outside help.
• 🤗 The story highlights the importance of admitting mistakes and remaining open to alternate perspectives in scientific inquiry.
• 🎟️ Albert Einstein may have regretted his mistake not only because he was wrong but also because he missed the opportunity to arrive at the same equations as Friedmann.
• 💁 Einstein's equations, adjusted with the mathematical trick to account for his mistake, now describe dark energy and form the foundation of our modern understanding of the universe's large-scale structure.

Questions & Answers

Q: What predictions did Einstein's new description of gravity make that were confirmed by experimental observations?

Einstein's new description correctly predicted the bending of starlight passing by the sun due to gravity and the redshift of starlight leaving large stars. Additionally, it predicted the propagation of waves of gravitation through empty space.

Q: Why did Einstein believe the universe was static and unchanging?

At the time, prevailing understanding held that the universe did not expand or contract. Einstein's small mathematical mistake reinforced this belief and led to his conclusion that the universe couldn't be expanding or contracting.

Q: Who discovered that the universe could be expanding, contracting, or static?

Russian physicist Alexander Friedmann used Einstein's equations to demonstrate that the universe had these possible states depending on the amount of matter and energy present. He corrected Einstein's mistaken calculation.

Q: How did Einstein react when he realized he had made a mistake?

Einstein initially published a criticism of Friedmann's work using the same erroneous calculation. However, Friedmann privately wrote to Einstein, explaining the correct calculation and asking him to either show where Friedmann was wrong or publish a correction. Einstein eventually admitted his mistake and retracted his previous criticism.

Summary & Key Takeaways

• Albert Einstein developed a powerful new mathematical description of gravity and used it to make various predictions.

• He successfully matched this new description with Newton's law of gravity and made predictions that were later confirmed by experimental observations.

• However, Einstein made a small but significant technical mistake that led him to believe the universe was static and unchanging.