sean carroll cosmology

I would have been a theist five hundred years ago. They're not tested by predictability; but they're tested by their coherence and by how well, for example, they would explain how an eternal being could create the universe, or how he could know, for example, tensed facts.

Question 4: It is a temporal concept; it makes sense if time exists. J. Now this is not just an unfounded metaphysical assumption on my part. If we’re allowed to take opinion polls I will poll my fellow cosmologists on whether God had anything to do with creating the universe and I will win by a landslide.

536-53. inflationary expansion in the very early universe. But in this case you can do better. We focus here mostly on the thermal history — how the constituents of the universe evolve as space expands and the temperature goes down. But let me in my final speech try to draw together some threads of the debate and see if we can draw some conclusions. [laughter] I'm not exactly sure what you read. “Why don’t bicycles just pop into existence?” Again, I tried to explain what makes the universe different but more importantly the phrase “popping into existence” is not the right one to use when you’re talking about the universe. The Big Picture: On the Origins of Life, Meaning, and the Universe Itself. It says that there’s a definite history of the multiverse and you can make predictions. does the CMB imply a special reference frame for the universe? It is certainly a true issue that we don’t know why the early universe had a low entropy and entropy has ever been increasing.

This model presupposes a reductionistic view of time according to which the direction of time is defined in terms of entropy increase. Listen to what he has to say about the low entropy condition of the early universe, which Robin Collins calls “potentially the most outstanding case of fine-tuning.” [27] Carroll writes, “If the universe we see is really all there is with the Big Bang as a low-entropy beginning, we seem to be stuck with an uncomfortable fine-tuning problem.” [28] So he tries to explain away this fine-tuning via the world ensemble, or multiverse, hypothesis. Even if you think the universe is finely-tuned and you don’t think that naturalism can solve it, theism certainly does not solve it. Since then it has been expanding at a finite rate for a finite period of time so how can we speculate that it may be infinite? That's why I used the word transcendent in that argument – this is something beyond the universe. . [13] So even if time as defined in classical physics does not exist at such an era, some sort of time would. His disagreements with number two, the evidences against theism, is largely based on using number three—the fact that theism is not well defined. Paul Davies, “The Big Questions: In the Beginning,” ABC Science Online, interview with Phillip Adams, (accessed February 23, 2014). to date, super-string theory or M-Theory, allows a “cosmic landscape” of around 10500 different universes governed by the present laws of nature, so that it does nothing to render the observed values of the constants and quantities physically necessary. Question 4: Well, that you have a cause has always precedes the effect. I am not arguing for some kind of interventionist deity, but rather, why does the universe exist? When a question is asked to Sean, Sean will have two minutes to answer. Similarly, you showed us how the Schwazschild metric was derived from Einstein’s equations. Here Dr. Carroll expresses scepticism that the fine-tuning is real. He says that it’s not really eternal, which it is hard to express the extent to which I think this is grasping at straws. We can’t expect to know what they’re going to do ahead of time. As so the example that Dr. Craig just gave about the blue dots and the red dots sadly almost never applies in cosmology because it assumes there is a discrete set of dots that we can color blue or red. How can we talk about “the age of the universe” when even my feet and my head differ in age? Okay. What is the amount of density perturbation in the universe? As stated, (2) is a disjunction, but its logical form is equivalent to (¬p & ¬q).

But he thought you couldn’t prove with demonstrative certainty that the universe did begin to exist. He received his PhD in astronomy and astrophysics from Harvard University. Post was not sent - check your email addresses! Two independent but closely interrelated lines of physical evidence support premiss (2): evidence from the expansion of the universe and evidence from the second law of thermodynamics. . There’s a theorem, Borde-Guth-Vilenkin, that has assumptions so if you violate those assumptions you can violate the theorem.

By “the universe,” I mean that reality which is studied by contemporary cosmology, that is to say, all of contiguous physical reality, which currently takes the form of space-time and its contents. I will confess a bit of frustration in this final talk because I think almost everything that Dr. Craig had said in his last talk he had already said, and I tried to give my best response to it. So I don't think it's helpful to talk about free will as an emergent reality when at a fundamental level you're affirming determinism. Maybe there is a principle, like Stephen Hawking would say, that puts the early universe in a low entropy state. Consider now the evidence from thermodynamics. Second, the evidence is against theism. But the real question I want to get to and the important one, I think, is what Roger Penrose talks about with the necessity of conscious observation and the neglect of the Copenhagen interpretation of quantum mechanics among practicing physicists who seem to ignore the necessity of conscious observation creating quantum decoherence. As Vilenkin said, all of the evidence is on one side of the scale, that the universe began to exist, and there are no models of a beginningless universe that are successful. And this is not a completely hypothetical circumstance. My wife gets very nervous when it's just my stream of consciousness working. Let me raise two concerns about this model.

That could be his predisposition or his hope or hunch or something of that sort. How does the dilution of energy density over time make this universe more flat? Yujin Nagasawa, Palgrave Frontiers in Philosophy of Religion (London: Macmillan, 2012), pp. Christopher Gregory Weaver, “On the Carroll-Chen Model,” September 17, 2013, arXiv:1309.4976 [physics.hist-ph], p. 11. Secondly, if the universe could come into being from nothing, then why is it that only universes can pop into being out of nothing? Space, Click to share on Facebook (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on Reddit (Opens in new window), Click to share on Tumblr (Opens in new window), Click to email this to a friend (Opens in new window),,, The Biggest Ideas in the Universe | 24.

Well, thanks again. I think that temporal becoming is a real and objective feature of the universe. 287-305).

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