We continue with J. Warner Wallace’s analysis of multiverse theories in his new book God’s Crime Scene: A Cold-Case Detective Examines the Evidence for a Divinely Created Universe.

The second reason multiverse theories fail to explain the origin of fine tuning is that rather than explaining the origin of fine tuning, the multiverse theory requires fine tuning to first exist.

If there is a multiverse vacuum capable of such creative activity, it would be reasonable for us to ask how the physics of such an environment could be so fine-tuned to create a life-permitting universe. As Oxford philosopher Richard Swinburne observed, any proposed multiverse mechanism “needs to have a certain form rather than innumerable possible other forms, and probably constants too that need fine-tuning in the narrow sense … if that diversity of universes is to result.” Eternal inflation, for example, requires a precise relationship between cosmological constants of gravity and the other forces of quantum physics. In other words, the vacuums proposed in multiverse models are equally fine-tuned.

Third, multiverse theories rely on speculative notions of time.

Theorists who propose a preexisting vacuum must account for the nature of time in this setting. All descriptions of this vacuum describe it as temporal (with bubble universes emerging or quantum events occurring over time). But the Standard Cosmological Model (as we described it in the prior chapter) indicates time, as we know it, began with our universe. Multiverse explanations must provide an account for the temporal nature of the vacuum lying at the core of their theory.

Fourth, multiverse theories result in absurdities.

Like string theory models, multiverse proposals result in a number of interesting (and disturbing) absurdities. If there are an infinite number of universes in the multiverse collection, and there exists a remote chance one of them could have a set of laws like ours (and a history similar to our own), we must accept (given the infinite size of the multiverse) an infinite number of universes resembling ours. In fact, if there’s a small chance any of these similar universes might have precisely the same history as our own (with someone exactly like you reading this book at this very moment), there are an infinite number of universes precisely the same as ours in every possible way.

The absurdity of this proposal has been noted by a number of physicists and philosophers. Multiverse models describe an ensemble of universes both identical and slightly different from our own. As Alan Guth admitted, “There is a universe where Elvis is still alive.” The incredulity of such a proposal seems a high price to pay to accommodate a theory yet unproven by the evidence. As Paul Davies said, “The very notion that there could be not just one, but an infinity of identical copies of you, leading identical lives (and infinitely many others leading similar but not identical lives) is deeply unsettling.”

Worse yet, if the multiverse model is true, we may not even be living in a “real” universe at all. If there is even a small chance our universe is simply a Matrix-like simulation (and this possibility certainly exists), the infinite number of universes assures there are also an infinite number of such “computer simulation” universes. While this probably seems absurd (and it ought to), it is the zany, inevitable consequence of multiverse theories.

While multiverse theories fail to explain fine tuning, one thing they concede is that the fine tuning in our universe must have been caused by something outside of our universe. There is nothing inside our universe that could have done the job, and this is a major concession. As Christian theists, we agree that something or Someone outside the universe is the cause of its fine tuning.

J. Warner Wallace, in his new book God’s Crime Scene: A Cold-Case Detective Examines the Evidence for a Divinely Created Universe, investigates the causes of the fine tuning of our universe. One of the most popular explanations is that there exists multiple universes (the multiverse) and ours is just lucky enough to have the fine tuning that permits life.

Wallace presents the multiverse theory as an explanation for fine tuning as follows:

Multiverse explanations, however, point once again to an external causal agent: a mechanism capable of creating an incredibly large number of universes, each with its own set of physical laws. Most of these universes in the multiverse collection are incapable of permitting life. Our universe, however, through “a series of cosmic accidents,” just happens to support our existence.

Multiverse theories overcome the incredible odds against life (and explain the appearance of fine-tuning) by increasing the chances of such a life-permitting universe. Multiverse theorists have proposed the creation of multiverses through a number of mechanisms, most commonly by way of “eternal inflation,” or “quantum tunneling.” Some physicists suggest the existence of an eternal, primordial vacuum (as we discussed in the last chapter).

According to proponents of eternal inflation models, if an infinitely old vacuum has been experiencing inflation, and the tiny bubble universes we described have emerged, each bubble universe might have its own characteristics and physical laws. Other physicists (such as Alex Vilenkin) propose “quantum tunneling from nothing” to explain the existence of an ensemble of universes without eternal inflation. In these quantum tunneling models, diverse universes pop into existence, because in “quantum mechanics the behavior of physical objects is inherently unpredictable and some quantum processes have no cause at all.”

In both eternal inflation and quantum tunneling models, the universes (some older than others) emerging from the vacuum coexist within the larger multiverse. In each of these proposals (eternal inflation, quantum tunneling, and even string theory models), the existence of a vast array of universes makes one like ours an inevitability.

Given a vast array of universes, one of them was bound to support life, goes the argument. The different forms of the multiverse theory each attempt to describe the mechanism for the creation of all these universes, but the outcome is the same: a massive number of universes.

But do these multiverse theories truly explain the fine tuning of our universe? Wallace thinks not. First, he argues that the multiverse theory lacks evidential confirmation.

Like string theory or M-theory proposals, multiverse models lack observational or experimental evidence. Scientists can’t access other universes in the multiverse because they are separated within the vacuum by too great a distance (and according to these theories, this distance is growing).  As a result, many scientists, especially string theorists, are suspicious about the existence of a multiverse. Some call it a “fantasy”; others call it “intellectually bankrupt” or a “cheap way out.” Lacking evidential support, many physicists see the multiverse theory as deficient when compared to efforts to find unity within the laws of physics.

But eternal inflation models face an even greater barrier. Our expert witness Alexander Vilenkin has already testified (along with Arvind Borde, Alan Guth, and Audrey Mithani) against the possibility of an eternal, uncaused, expanding vacuum. According to these experts, if inflation (expansion) has been occurring in this vacuum, it must have had a beginning and therefore cannot be eternal.

In part 2, we will look at 3 more reasons multiverse theories fail to adequately explain the origins of fine tuning.