28 | Roger Penrose on Spacetime, Consciousness, and the Universe
Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
The Explanation for Stretching Out the Big Bang
Maxwell's famous equations are insensitive to the scale. So you can squash and stretch as long as you do it equally in both directions. In space time, that means you squash the time in the space equally. Then that kind of transformation is not noticed by light or not noticed by the Maxwell equations. And that's true also of the Yang-Mills equations of particle physics and nuclear physics. They all have this except for mass. It's if you don't have any mass, you don't notice the difference. If you move at the speed of light. At the speed oflight. This is a factor not thinking of particles, but the fields and the electromagnetic field which light is
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