Essentially, Siegel, the person who has Big Problems with something as widely accepted as the Big Bang, is quite prepared to accept all this far out stuff. That is where the naturalist project is just now.
Is the Big Bang the least popular widely accepted science theory? Theoretical astrophysicist Ethan Siegel wishes it out of existence by positing a cosmic inflation that wipes out all possibility of knowledge.
Siegel: “… if the theory of inflation is a good one, and the data says it is, a multiverse is all but inevitable.” Our physics color commentator Rob Sheldon writes to offer a response.
Make no mistake, the Big Bang is unpopular in many quarters and an exterminator has long been sought. Here’s the problem: The explanation for an event may be outside the event. In that case, one can’t derive an explanation from within the event.
From Physical Review D: We investigate the initial conditions of inflation in a Bianchi I universe that is homogeneous but not isotropic. We use the Eisenhart lift to describe such a theory geometrically as geodesics on a field-space manifold. We construct the phase-space manifold of the theory by considering the tangent bundle of the field Read More…
Sheldon: The inflationary proposal has always been ad hoc. That is, a huge, faster-than-light expansion of the universe was proposed as a solution to the “flatness” problem, where the universe expands at a rate just sufficient to counter the gravitational attraction, where “just sufficient” means one part in 10^60 power. The inflationary model was invented to solve this fine-tuning problem.
For example, how can we “partition an infinite multiverse so to arrive at the finite probabilities we observe and require (e.g. for quantum mechanics) because in an infinite multiverse everything that can happen happens an infinite (with the same cardinality) number of times?”
Two things many cosmologists would like to get rid of are the Big Bang and apparent fine-tuning of the universe. Telling a different story is difficult mainly due to lack of evidence for a different story but they can make do with discrepancies. But then maybe the years have made some of us cynical.
he author of Lost in Math: How Beauty Leads Physics Astray, makes clear that cosmic inflation was intended to deal with evidence for fine-tuning, which she considers a “waste of time.” But, as she shows, the cosmology has gone nowhere.
Error alone does not apparently explain the discrepancy in these figures: For some methods, which rely on using the light from supernova and pulsing stars called Cepheid variables to determine their changing distance, it appears that objects move away from the Earth 73 kilometers per second faster for every 3.26 million additional light-years, also called Read More…
An “expert voice” astrophysicist explains that the Big Bang is now the “vanilla Big Bang,” which is unpopular because it doesn’t explain all observations: The Big Bang model is our most successful explanation for the history of the universe that we live in, and it’s ridiculously easy to encapsulate its core framework in a single, Read More…