The Big Bang - Before and After
Aug 14, 2016大爆炸理论是关于宇宙“诞生”的流行理论。它假设有一个奇点,或者说超高密度态。
After listening to the most recent episode inour cosmology series, onwhether the laws of physics could ever change, a listener emailed us with a question:
We can trace our fundamental forces (strong and weak interaction, electromagnetism, gravity) back to microseconds after the big bang. If we can trace them back this far, wouldn't the only way to change the fundamental laws of the universe be to recreate the conditions of the big bang? Which is, of course, impossible.
- Zach in the University of Arkansas
非常好的问题,扎克!We put it to our guest on the show, Massimo Pigliucci, and he had this answer:
There are a couple of possible answers to that question:(I) we *think* we can trace things back to microseconds after the Big Bang, but that's because we *assume* the current laws have not changed. We don't actually know this. David Hume used something like this to set up is famous problem of induction: in order for science to work we have to assume, without proof, that things have and will always work the same way...(II) we don't need to recreate the Big Bang , according to Smolin we might be able to get information about what happened before because whatever was there may have left traces. Needless to say, this is highly speculative.
大爆炸理论是关于宇宙“诞生”的流行理论。它假设有一个奇点,或者说超高密度态。
量子物理学被许多人认为是科学产生的最强大的预测理论。
All the matter we have ever observed accounts for less than 5% of the universe. The rest? Dark energy and dark matter: mysterious entit...
At the foundation of modern theoretical physics lie the equations that define our universe, telling us of its beginnings, evolution, and future.
Strange things are said about time: that it's illusory, that it has no direction. But what about space, or the space-time continuum?
大爆炸理论是关于宇宙“诞生”的流行理论。它假设有一个奇点,或者说超高密度态。
量子物理学被许多人认为是科学产生的最强大的预测理论。
All the matter we have ever observed accounts for less than 5% of the universe. The rest? Dark energy and dark matter: mysterious entit...
At the foundation of modern theoretical physics lie the equations that define our universe, telling us of its beginnings, evolution, and future.
Strange things are said about time: that it's illusory, that it has no direction. But what about space, or the space-time continuum?
Comments(1)
MJA
Friday, September 15, 2017 -- 5:12 PM
Another answer: I believe theAnother answer: I believe the only physical laws of the Universe are the ones we ourselves create. Without mankind's laws, the Universe would be, as it truly is, entirely free. Freedom, something so natural and real that men like Lincoln, Gandhi, and King and so many others fought and died for it. A state on universal equilibrium, imagine that! Einstein's quest for a unified field equation was much more simple than thought, the answer is =