Perhaps “you” will live forever after all

Where fractals meet quantum mechanics
Where fractals meet quantum mechanics (Photo credit: Cristóbal Alvarado Minic)

This is inspired by Max Tegmark‘s Our Mathematical Universe: My Quest for the Ultimate Nature of Reality: I have been thinking about this since I finished the book and I cannot find a convincing argument against the thesis (certainly the ones Tegmark uses in the book didn’t impress me – but perhaps I misunderstood them.)

So, let us conduct a thought experiment that might suggest “you” can live forever.

In this world we assume that you don’t do anything dangerous – such as commute to work. The only factors that could kill you are the normal processes of human ageing (and related factors such as cancer): your fate is completely determined by chemical processes in your body.

And we accept the “many worlds” view of quantum mechanics – in other words all the possible quantum states exist and so “the universe” is constantly multiplying as more and more of these worlds are created.

Now, if we accept that the chemical processes are, in the end, driven by what appears to us as stochastic (random) quantum effects – in other words chemicals react because atoms/electrons/molecules are in a particular range of energies governed by the quantum wave equation – then it must surely be the case that in one of the many worlds the nasty (to our health) reactions never happen because “randomly” it transpires that the would-be reactants are never in the right energy state at the right time.

To us in the everyday world our experience is that chemical reactions “just happen”, but in the end that is a statistically driven thing: there are billions of carbon atoms in the piece of wood we set fire to and their state is changing all the time so eventually they have the energy needed to “catch fire”. But what if, in just one quantum world of many trillions, the wood refuses to light?

So, too for us humans: in one world, the bad genetic mutations that cause ageing or cancer just don’t happen and so “you” (one of many trillions of “you”s) stays young for ever.

The obvious counter argument is: where are these forever-young people? The 300 year olds, the 3000 year olds? Leaving aside Biblical literalism, there is no evidence that such people have ever lived.

But that is surely just because this is so very, very rare that you could not possible expect to meet such a person. After all, around 70 – 100 billion humans have ever been born and each of them has around 37 trillion cells, which live for an average of a few days (probably) – so in a year perhaps 37 billion trillion cell division events – each of which could spawn a new quantum universe – take place. That means the chances of you being in the same universe as one of the immortals is pretty slim.

Yet, on the other hand, we all know someone who seems to never age as quickly as we do…

…I’d be really interested in hearing arguments against the hypothesis from within the many worlds view of quantum physics.

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6 responses to “Perhaps “you” will live forever after all”

  1. This is what is referred to as Quantum Immortality. A related concept is Quantum Suicide, which also follows the Many Worlds Interpretation. The thought experiment is that instead of avoiding danger like you assume, you are put in danger. You would essentially take the role of the cat in Schrodinger’s Cat thought experiment, where a quantum process determines if you live or die. Since there is necessarily a superposition of alive and dead states, in the many worlds interpretation it is not possible for the experimenter to experience death from the experiment. The experimenter will perceive having survived every quantum process. Unfortunately, for the majority of worlds the experimenter’s colleagues will be mourning the experimenter’s untimely death.

    I think any argument against it from within many worlds will necessarily be hit with the counter that there is a remotest of chances you will be immortal in a given universe, and we don’t see any immortals because it is essentially a one in infinite chance, which is 0%.

    1. Thanks. That’s a rather clearer exposition of Quantum Suicide than the one found in Tegmark’s book, it has to be said.

  2. I think you’re implicitly assuming that the stochastic “bad” events are probabilistically independent of the stochastic “good” (or at least “normal”) events (chemical interactions, energy releases etc. inherent in and necessary for movement, growth, cognition …). If they are actually dependent, I wonder whether your low-probability immortal might not be stuck in stasis as an embryo or infant (or frozen in place as an adult like a statue) …

    … which, come to think of it, might explain the otherwise inexplicable lawn gnomes.

    1. Yes, I am making that assumption. I suppose, though I can suggest an alternative – the nail that never rusts?

      1. I’m not familiar with the nail that never rusts … and barely familiar with the Rusty Nail (, as I prefer my Scotch neat. Is this another quantum physics Gedankenexperiment?

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