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TagMultiverse (proponents)

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Exploring the Multiverse Some elements provided courtesy of NASA

Astrophysicists Lock Horns Over Whether Multiverse Must Exist

Ethan Siegel says it follows naturally from inflation; Adam Frank says inflation is not that robust a theory

Recently, online magazine Big Think challenged two astrophysicists, Ethan Siegel (Yes) and Adam Frank (No) to debate the question. From Ethan Siegel’s argument for the multiverse: If cosmic inflation and quantum field theory are both correct, then the Multiverse arises as an inevitable consequence of the two, combined… Those regions of space where inflation end and the hot Big Bang begins are each their own, independent Universe, and together, they make up a Multiverse. We may not be able to measure these other Universes, at least not just yet, but there’s every reason to expect that if inflation and quantum field theory are both correct, then the Multiverse inevitably exists. Ethan Siegel and Adam Frank, “Is the Multiverse real? Two…

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multiverse conceptual illustration

In an Infinity of Universes, Is Another You Reading This Article?

Maybe. But the recent science evidence is not especially encouraging

It is generally believed that the early universe widely inflated. So, reporting on a recent article submitted to Journal of Cosmology and Astroparticle Physics, Stony Brook astrophysicist Paul Sutter points out: First off, they found that eternal inflation wasn’t nearly as common as originally thought. Their explanation for why cosmologists had thought eternal inflation was generic was because those earlier cosmologists had studied only a limited set of models. They found that many viable inflation models (“viable” here means they didn’t obviously contradict observations) didn’t lead to an eternally inflating scenario. Paul Sutter, “How real is the multiverse?” at Space.com (December 16, 2021) Cosmologists line up on both sides: Prominent proponents of the multiverse have included well-known cosmologists such as Max Tegmark and…

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multiverse conceptual illustration

Multiverse Cosmology Is Not a Good Argument Against God

Or against fine tuning of our universe. God could have created countless universes on various principles for a variety of reasons

New Scientist’s executive editor Richard Webb, a “recovering particle physicist,” offers a look at the current state of the idea that there might be an infinity of universes out there. Why believe it? Mainly, it turns out, to avoid believing something else: Gods and their intelligent designs are less in the mainstream of scientific thought now, yet similar ideas about an optimal universe still trickle through cosmology. That is principally down to some mysterious numbers that determine its workings. Tot them all up in the standard models of particle physics and cosmology, and you end up with about 30 constants of nature – numbers like the strengths of the fundamental forces and the masses of elementary particles that our theories…

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Small kitten

In an Infinity of Universes, Countless Ones Are Run by Cats…

Daniel Díaz notes that most of the talk about the multiverse started to appear once it was realized that there was fine-tuning in nature

Walter Bradley Center director Robert J. Marks has been doing a series of podcasts with Swedish mathematician Ola Hössjer, and Colombian biostatistician Daniel Díaz in connection with a recent co-authored paper on the fine-tuning of the universe for life in the Journal of Cosmology and Astroparticle Physics. In the first portion of this episode, podcast 153, “Why is there fine-tuning everywhere?” they look at whether life was seeded in our universe by advanced life forms (directed panspermia), as advocated by some prominent scientists. In the second portion, they discuss the view — again, held by prominent science figures — that our universe is an advanced computer sim. In the third segment, they tackle the idea that there is nothing to…