THE FOREVER FIELDS OF REALITY
Michael Faraday introduced
One of the most radical ideas in science.
They thought that he had,
For once, gone too far.
Particles became rather irrelevant,
Being mere spigots through which forces flowed.
The real stuff of reality was the forces flowing,
The particles being only the source.
The burden of reality had shifted,
For the space between particles became primary.
Particles were only the intersection
Of the forces that wove the universe.
Forces create stresses in space,
A superhighway
Of how to get from here to there.
An electron wiggles in the sun,
Tweaking the E/M field;
The ripples travel for 8 minutes
Then tickle an electron in your eye.
You see the light;
Light is a tweak.
Physics has never been the same since.
The field concept became real,
The idea being the same as the thing,
Fudging forever the difference
Between something and nothing;
Yet, fields are made of something real,
For they have energy.
Einstein called the field that be
“A change in the concept of reality…
The most profound and fruitful one
That has come to physics since Newton.”
Matter, then, is simply a place where
Some of the field happens to be concentrated.
Matter travels like a wave in a rope,
But, the rope itself does not travel.
The field is not so much
Something in space,
But more like of space.
This is why all particles of a type are identical;
For they are each manifestations
Of their fields everywhere the same.
The field takes on a life of its own,
Even when the object that created it is gone.
The traveling kinks continue;
They propagate endlessly.
Where the vacuum is free of matter
It is not free of field, but filled with it.
Energy and mass are the same stuff,
But it takes a whole lot of energy to make mass.
Field is thus the bridge
Between matter and empty space.
Fields can’t go away,
As they’re part of the structure of the vacuum;
When in their quietest possible state
They are the vacuum.
This is about as close to nothing
As anything ever gets.
Forces act on things,
While matter is acted upon;
You can walk through a field,
But you cannot walk through a wall.
Kinks in fields can pile atop one another;
Kinks in matter hold each other at arm’s length.
Yet, somehow, beneath it all,
They are kindred spirits.
Faraday made fields real;
Quantum mechanics made them magic—
And lumpy—the currency of QM.
Everything melts, via uncertainty,
As when we try to measure a quantum property.
But this, too, means that no quantum property
Can ever be zero, for zero is a precise amount,
That is, it is that motion can never cease.
Try to pin down an electron,
Such as putting it in a box,
And it increasingly moves about,
Ever faster.
It is heads or tails while it is still spinning?
Well, it is just a fuzzy ‘both’ yet neither.
In a way, QM eliminated
The very idea of zero
From the physical world,
As ‘nothing’ never sleeps,
But is ever up to something.
(The Loan Shark)
An unusual track was found in a cloud chamber
That Carl Anderson was using
To watch the trajectories of cosmic rays
Streaming in from space.
The track was like that of an electron—
Except that it curved backwards
Under the influence of a magnetic field.
It was the positron, now used in the PET.
A particle and its antiparticle annihilate,
Giving back, in the process, the energy it took
To create them in the first place.
Do they live on borrowed time and energy,
A creation near ‘ex nihilo’ all over the universe?
Can they sneak out of the vacuum
So long as they snuck back in again
Before you noticed?
“What is the point?”
Thought Richard Fenyman:
“Created and annihilated,
Annihilated and created—
What a waste of time.”
They come and go like dreams,
The lighter ones, like electrons,
Popping out more often.
They are the ghosts of the yet unborn.
The road from ‘nothing’ to something
Goes in both directions;
With enough energy
They can become real.
The so-called ‘vacuum’ is creative.
The field fluctuates this way and that,
But, on average, the net energy is ‘zero’.
The once melted vacuum fell and froze,
Gaining structure,
Such as when water becomes ice.