Connect the Dots Physics

How many of you have heard about inflation?

No, it’s not what’s going to happen because of the Fed’s monetary policy. It’s what happened roughly 14 billion years ago during the first moments of the universe.

Or it’s what we use to connect the dots.

One of the great accomplishments of the last 15 years is the amount of detailed data we have on the cosmic microwave background. For those who don’t know, this is the light that came from ‘the last scattering surface’ when the universe cooled enough that atoms started forming. Before that the light had been in thermal equilibrium with the protons and electrons, which means the photons were scattered before they could move any distance. This signal was first observed in the sixties and led to a Nobel Prize in 1978. The thing that is new, or at least more recent, is that there is data on the detailed structure of this last scattering surface.

And it’s ringing.

When one plots the frequency spectrum of the spatial differences, it displays a set of harmonics. Call it the aum of the early universe if you want. Well, that’s fine. Why shouldn’t there be sound waves bouncing around in the plasma of the early universe?

The problem is the phase coupled with the finite speed of light.

This issue is that the scale of these oscillations only recently entered the light cone of the rest of the universe. Put another way, the oscillations which cause this ringing were of such a scale that they could not harmonize, or be in sync at the time of the last scattering surface. Consequently, they should not be in time with each other (random phases), which would not give a set of harmonics. It would just give a noise spectrum.

Here be dragons, I mean inflation.

A classic way around a problem is to change the question. Rather than directly answer how these oscillations could be in phase, inflation postulates that their scale was small enough in the early universe that the oscillations could be in sync (inside the light cone), then something called inflation pushed the scale of these oscillations outside the light cone.

I consider this an example of what I consider the connect the dots approach. Since we know something has to connect what came before to what came after, we postulate its existence and give it a name. A similar story holds for ‘dark energy’. In neither case is there an explanation of a mechanism of what would cause the phenomenon, just that there is a gap in our knowledge which requires a solution with certain properties.

One might wonder why we care about this ringing. The answer is that it ties into all sorts of other questions about why physics works the way it does: quantum mechanics, relativity, etc. I’m not enough of an expert here, but I know enough to know that it’s important.


A Simple Ode to Robin Williams

There once was a large porcelain doll that cried all the time.
It cried for its emptiness.
It cried for its loneliness.
It could not stop crying.

There was a little, stuffed clown who heard these cries,
and it thought to itself
This doll is empty.
I can fill it with laughter instead of cries.

And so one day, the clown visited the crying doll.
And it put its mouth to the doll’s side and laughed a hearty laugh
That echoed inside the doll.
It did this the next day, and the day after that, and the day after that, …

But even as his laughter entered the doll,
The cries of the doll entered him.
The cries slowly undid his stitching,
And one day as he came back from his visit to the doll, he simply fell apart.

The doll still cries today.
There are those who say it is destiny, that that is who the doll is.
But the laughter of the clown still echoes inside the doll.
And the doll remembers the one who made those echoes.

Sins of Omission

Everyone is aware of the Senate report on CIA torture during the ‘war on terror’ at this point. Working in an international workplace, I don’t see where revealing it could do any actual harm. Anecdotal evidence was already abundant, and when things are covered up, it only encourage people to believe the worst. There seems to be less emphasis on the willful neglect of oversight on the part of the Senate committee. Which leads me to the subject of this post and two items that it made me think of.

The first of these is the movie The Insider. If you haven’t seen it, I would suggest it. It stars Al Pacino and Russell Crowe and dramatizes the incident where big tobacco pressured 60 Minutes into retracting a story exposing them. There’s a point where Al Pacino makes a judgment, without saying it, stronger than I’ve ever seen it made anywhere else.

Integrity is something you have all the time, or you don’t have it any of the time.

Trust Al to know how to make a point. I would suggest it to the CIA director.

The committee on the other hand reminded me of a quote.

All that is necessary for the triumph of evil is that good men do nothing.

I knew I had heard it, and it is attributed to Edmund Burke. Although several things he said can be paraphrased that way, there is no evidence that he ever actually said those words. Yet it’s a regular quote. And the equivalent has shown up in quotes from other prominent figures. Being a scientist, I admit to liking Einstein’s version.

The world is in greater peril from those who tolerate or encourage evil than from those who actually commit it.