Evidence · Case 09 · Atheism
Eternal and cyclic cosmological models
One exhibit from the free evidence repository at apologetics.pro.
If the universe has no beginning, it needs no cause of its beginning. Some cosmologists explore cyclic, bouncing, or otherwise past-extended models, and some simply treat the universe as a brute fact that needs no further explanation. But the Borde, Guth, and Vilenkin result constrains models that expand on average, and current evidence favors a finite past, though the question is not closed. Calling the universe a brute fact is a stopping point, not an explanation, and the theist offers a different one.
Sources
Objections & responses
- The Hartle-Hawking no-boundary proposal and Penrose’s conformal cyclic cosmology are live models. Isn’t a single paragraph dismissing them too thin?
The main models deserve naming: Hartle-Hawking’s no-boundary proposal, Penrose’s conformal cyclic cosmology, the Steinhardt-Turok ekpyrotic model, and loop quantum cosmology bounces. Each faces specific criticisms: the no-boundary proposal’s imaginary time is a mathematical device whose physical meaning is disputed, cyclic models face entropy accumulation over infinite cycles, and bounce models require physics that has not been confirmed. The general point stands: none has achieved consensus, and several have been shown to require a beginning or to break down over infinite cycles. The question is not closed, and it should not be presented as if it were.
- Calling the universe a brute fact is a stopping point, not an explanation, but so is calling God a brute fact. Every view stops somewhere.
Correct, and every worldview must stop at something uncaused. The difference the theist argues for is that God is offered as a necessary being whose non-existence is impossible, whereas the universe looks contingent: its constants, its particle count, its very existence all seem as if they could have been otherwise. Whether that distinction holds is the debate under the next claim, on contingency, and this exhibit should not be read as if the naturalist’s stopping point were uniquely arbitrary. It is arbitrary only if the universe is contingent, which is the thing to be argued.
- “Whatever begins to exist has a cause” is an inference from things inside the universe, where beginning means rearranging existing matter. The universe beginning from nothing is a different kind of event, and we have no experience of it.
This is the strongest challenge to the first premise. The reply is that the premise is not an empirical generalization but a metaphysical principle: things do not come into being uncaused from literally nothing, because nothing has no properties, including the property of producing things. If the principle failed, there would be no reason anything does not pop into existence uncaused all the time. Critics answer that quantum events look uncaused, which the Krauss exhibit addresses. The premise is defensible, and it should be described as a philosophical principle rather than a law of physics.
- Even granting a cause, why must it be personal, or God? It could be an impersonal quantum state, a prior universe, or something we have no concept of.
The step to God is a reasoned inference, not a proof. The argument for personhood is that a timeless, changeless cause that produces a temporal effect must either produce it necessarily and eternally (in which case the universe would be eternal, which it is not) or by free choice, which requires an agent. Critics dispute that dichotomy. The prior-universe option is addressed by the Borde-Guth-Vilenkin theorem, which constrains the whole chain of expansion, not just this universe. Weigh the personhood argument on its own terms; it is the step where the most is claimed.