The clash between gravity and quantum mechanics poses no practical problem
for the contemporary universe. Astrophysicists apply the tenets and tools of
general relativity and quantum mechanics to very different classes of problems.
But in the beginning, during the Planck era, the large was small, and we suspect
there must have been a kind of shotgun wedding between the two. Alas, the vows
exchanged during that ceremony continue to elude us, and so no (known) laws of
physics describe with any confidence the behavior of the universe over that time.
for the contemporary universe. Astrophysicists apply the tenets and tools of
general relativity and quantum mechanics to very different classes of problems.
But in the beginning, during the Planck era, the large was small, and we suspect
there must have been a kind of shotgun wedding between the two. Alas, the vows
exchanged during that ceremony continue to elude us, and so no (known) laws of
physics describe with any confidence the behavior of the universe over that time.
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