Reading Comprehension

PT152 · S3 · P4 · Q20 Carroll and Chen's Multiverse

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Physicists posit that at first our universe was infinitesimally small and infinitely hot and dense.

Topic

Starting conditions of the universe

Framework

Old/New

Main Point

Carroll and Chen are positing that the origins of our universe was a fluctuation of energy in cold, empty space, within a vast low entropy multiverse.

Summary

The first two paragraphs introduce some background information on the Big Bang inflationary period at the beginning of our universe, the view of C&C that this type of event isn't unique, and the emerging picture of the multiverse.

The third paragraph describes how C&C got to their view, via work on entropy, and then it explains what entropy is and provides an example.

The fourth paragraph brings together the two different threads: because of what we know about entropy, what we believe about the Big Bang seems like quite a mystery. The starting conditions for the Big Bang seem like extremely unlikely starting conditions. C&C's innovation (New) is saying that the most common starting condition would be cold, empty space.

The fifth paragraph, brings in the Recent (New) research of two other people, G&V, who are able to potentially explain how cold/empty space could give way to a fluctuation as big as the Big Bang.

The last paragraph ties it together: C&C think that our universe could have emerged from an energy fluctuation in cold, empty space, occurring in a high entropy multiverse, and they think this phenomenon would likely have occurred more than once.

20.

Which one of the following most accurately states the main idea of the passage?

  1. Correct

    Carroll and Chen theorize that

    Why this is right

    Since the Problem/Question was, "Given that high entropy is what we expect to be the default condition of the universe, why does it seem like the Big Bang came from some small/hot/dense low entropy precursor". The researchers / the passage answer this question by saying, "Well it low entropy locally, in the subatomic pocket of space where the fluctuation occurred, but this was just a common blip in a high entropy multiverse".

    Skill tested: Main Point · how this choice captures the passage's function is the move to repeat next time.

    54% picked this

  2. According to Carroll and Chen,

    Too Narrow Contradicted

    Too Narrow Contradicted: according to C&C The 2nd law of Thermodynamics is only brought up to set the stage for a conversation about entropy ("C&C were initially interested in time/entropy), to segue into the central mystery of the passage: how could our universe start from something low entropy if high entropy is the default condition of the universe? The 3rd paragraph is saying that "all of physics" shares these ideas about entropy / thermodynamics.

    2% picked this

  3. Carroll and Chen challenge the

    Contradicted

    C&C aren't saying that the universe didn't undergo an inflationary stage. They're still upholding the possibility of inflation. They are just trying to resolve the question of why the pre-inflationary universe seems low entropy. They aren't changing the inflation part of the Big Bang story; they're just saying, "inflation (the Big Bang / aftermath) didn't come from some rare, unlikely low entropy universe, rather the Big Bang started in a low entropy subatomic patch of empty space, which was inside of a larger high entropy multiverse."

    12% picked this

  4. According to Carroll and Chen,

    Too Narrow

    They would agree with this, but this is far too narrow. Their one sentence takeaway for us isn't, "Small / hot / dense is unlikely to be the random initial condition for a universe". Their one sentence takeaway is "the Big Bang was probably just a relatively normal fluctuation that occurred in a tiny subatomic area of space within a high entropy multiverse".

    15% picked this

  5. Carroll and Chen posit that

    Too Narrow

    This is a pretty compelling second option. C&C would agree that our universe is one of potentially many in a big ol' multiverse. But this answer is doing a poor job of addressing the central Problem/Question and C&C's innovative Solution/Answer. The problem/question centered around the entropy paradox, so for this answer to not address the initial condition entropy problem is dodging the central issue of the passage.

    17% picked this

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