So I have figured out a method that uses Quantum Harmonic Oscillators to fix the vacuum catastrophe. Basically QFT models the quantum vacuum as a field of an infinite number of quantum harmonic oscillators (QHO) of every possible frequency located at every point in space.
Then when they do the math, they either get an infinite energy density for the vacuum, or when they try to constrain the problem, a finite energy density that is still 122 orders larger than the empirically determined value of about a nanojoule per cubic meter.
Here are some references for the vacuum catastrophe and why it is a problem:
Adler, R.J., Casey, B. and Jacob, O.C. (1995) Vacuum Catastrophe: An Elementary Exposition of the Cosmological Constant. American Journal of Physics, 63, 620-626.
Persinger, M. (2014) A Possible Explanation for the Vacuum Catastrophe. International Journal of Astronomy and Astrophysics, 4, 178-180.
The fix requires several new assumptions that act as additional boundary conditions on the problem:
Assumptions
1. Our causally connected patch of the universe has a fundamental frequency
that changes in time in relation to the causal volume's change in size.
2. The Planck frequency,
, where
tP is the Planck time, is the maximum possible frequency in the universe that does not get censored by event horizons. It serves as the upper bound of our calculation.
3. Not all vibrational frequencies are possible. The only allowed frequencies are the harmonics, i.e. integer multiples, of the fundamental frequency
. It is presumed that the other infinite vibrations of the field cancel each other out by destructive interference as per Feynmann. Or maybe it is the result of something analogous to Pauli's exclusion principle but for virtual particles.
4. The universe is a very large hypersphere with a very small positive curvature k. According to the final analysis of the Planck satellite data, the team is 99% confident that the universe is closed with
.
Here is a supporting reference for this geometry for the universe:
Di Valentino, Eleonora & Melchiorri, Alessandro & Silk, Joseph. (2020). Planck evidence for a closed Universe and a possible crisis for cosmology. Nature Astronomy. 4. 1-8. 10.1038/s41550-019-0906-9.
Derivation
Now using those four assumptions or boundary conditions, the equation for the quantum harmonic oscillator (QHO) is:
setting n to zero gives us the formula for the ground state of a single QHO then adding the ground state of all possible frequencies gives us:
Since k represents all possible wave vectors in the field, previously this led to unmanageable infinities. Transforming the equation into a continuous integral did not help matters much, allowing for finite but nonsensical numbers 122 orders of magnitude too large..
However, applying my previously stated boundary conditions to the equation gives us a new formula that does not generate infinite energies from fields enclosed by event horizons. Note that k has gone from being the index of a wave vector to being the k-th harmonic of the fundamental frequency.
Since \omega_0 can be considered constant during the time frames associated with measurement, one can remove it and the other constant factors from the sum. We can also substitute
into our upper bound. Since k is an integer ranging from 0 to the highest allowed harmonic of the QHO, the sum reduces to nth triangular number.
At this point, we can apply our initial boundary conditions and definitions,
and
and substitute them into our energy equation and then simplifying yields the following expression for the total zero-point energy for the vacuum of our causal space:
So now we have the zero point energy of our causal space, we still need to figure out
which is the energy density of our causal space. For that, we need to know the volume of our causal space. Since from the Nature article referenced above, there is a 99% chance the universe is closed, we will posit a 4-D hypersphere for the shape of a causal space. We assume that the radius of the hypersphere is the same as the radius of our Hubble sphere which defines our causal space.
The Hubble radius is
or about 14 billion light years.Since the current Euclidean 3-D Hubble volume only encompasses our plane of simultaneity, our now, it is only meaningful in the present moment. If we want to know our entire causal volume, past, present and future then we need to use the 3-D surface area of the 4-D hypersphere as our volume. The equation for this "surface volume" is
.
We plug the expression for the Hubble radius into our volume expression to give us the total volume of our causal space:
Now we can determine the energy density of the vacuum
as follows:
Cancelling terms and simplifying gives us our final expression for the energy density of our causally connected vacuum:
This expression gives us a value very close to experimental observation. We can perform a final sanity check on our result by finding out what fraction of the total mass-energy of our causal space this number represents. We do this by calculating omega
, the unitless cosmic density parameter which is the ratio of the calculated energy density of our vacuum over the critical energy density of the universe for closure.
Here
is the cosmological critical mass density.
Plugging in our known expression for the energy density and simplifying gives gives us:
We can simplify omega even further by noticing that amazingly we have recovered the Planck time on the right hand side of the equation:
This results in a dark energy component that remains relatively stable at approximately 2/3 or 67% of the critical density for a wide range of values for the Hubble parameter H and behaves very much like a cosmological constant.
So there you go, that is how to fix the vacuum catastrophe. You are welcome. :)
Stuart LaForge