Why can't current theories describe what happened during the Planck era?
A)We do not know how hot or dense the universe was during that time.
B)We do not understand the properties of antimatter.
C)We do not yet have a theory that links quantum mechanics and general relativity.
D)The Planck era was the time before the Big Bang,and we cannot describe what happened before that instant.

Question

Quizplus · Accepted Answer

The Planck era is a period that occurred just after the Big Bang, and is characterized by very high temperatures and energy densities. During this time, our current theories, specifically quantum mechanics and general relativity, are unable to describe the events that occurred. There is no current theory that can link the two, and this is known as the problem of quantum gravity. Therefore, choice C is the best answer. Choices A, B, and D are not completely accurate, as we have some understanding of these topics, but they are not sufficient to fully explain the Planck era.

Why Can't Current Theories Describe What Happened During the Planck