Hawking, Einstein and the Theory of Everything

Has your eye ever been captured by the beauty of a pearl, the milky sheen with just a hint—almost imagined—of blush?   That blush makes pearls seem to be living things.  When I first learned what a pearl was and how it was made I thought it was a grand mystery.  I got my mother’s pearls out of the drawer where they were kept, carefully wrapped in tissue and velvet, and stared intently at the large center pearl of the strand.  I imagined myself growing very, very small and diving through the layers of nacre to the center of the pearl.  There I would live in my own tiny world.  In my mind, when I sat on the center grain of sand that was my pearly home and looked at the curved sky of solid, yet seemingly transparent white, to the curved shell of pearly heaven, my world always seemed very large to me, even though I was a spec and my universe only a pearl. 

            When I study astronomy, I feel like I am back inside that pearl.  Physicists understand what it is like to be very small and very large all at the same time.

I have been following, with constant wonder, the gradual confirmation, challenge and acceptance of the concept of dark energy.  It also affirms what I have always felt about Albert Einstein—he had the ability to be right without even knowing he was, or why such rightness had to be.  On the matter of Dark Energy, Einstein was right in two ways, first his cosmological constant (which he later repudiated, like any good scientist, for lack of confirming empirical data) does work to explain the presence of Dark Energy.  Second, and most important, he was right in his belief that the unifying aspect of all theories would be in gravity. 

            Cosmic Microwave Background (CMB) has provided both answers and questions to cosmologists.  Microwave energy, measured through an alphabet soup of new devices, is a remnant of the Big Bang.  The fluctuation of the CMB shows the kind of hot and cold spots scientists expect from the results of the Big Bang.  An explosion in the relative vacuum of space will expand in a sphere, but debris—even primordial atomic debris—will scatter in clumps, braids and strands.  Cosmic Microwave Background reflects this dispersal as we believe it may have looked from about 400,000 years after the Big Bang. 

The alternating compression and expansion of microwaves (compressed by gravity, expanded by radiation) produce both a sound wave and heat.  If you want to illustrate this principle in a highly simplified way, take a thick rubber band and rapidly expand and release it.  Listen to the low thumping sound it makes.  On one of the last expansions, touch the rubber band to your upper lip.  It will be warm.  While the heat signature of the microwave background is too delicate to be detected, that rhythmic throb of the microwave expansion and contraction is what cosmologists are listening for.

            There is also ample evidence to confirm that what you and I would call, “mass,” makes up only about 5% of the universe.  Another 30 % has been identified as dark matter—physically there, but unseen.  That leaves a whooping 65% currently supposed to be dark energy.  Dark energy (oh, would Einstein love this!) apparently is antigravity.  

 

            I once had the pleasure of hearing Dr. Margaret J. Geller talk about her study of galaxies.  She is the Harvard astrophysicist who proved that galaxies cluster on what appear to be the surface of cosmological bubbles.  Just as soap bubbles coalesce along the rim of connected bubbles, sharing some space side by side, while leaving huge arcs of the bubble untouched, so galaxies form in our universe.  These are not real bubbles of course, but the bubble analogy explains the structure.

            Bubbles, planets, and stars, like my pearls, are all spheres.  And there is a very good reason.  Everything that exists in the physical world, no matter how large or small, has mass.  Everything with mass, has a gravitational force.  Gravity exerts a force that is directly proportional to the size of its mass and inversely proportional to the square of the distance between it and any other mass.  This force is exerted equally in every direction from the mass itself.  Because of this, objects left at the mercy of their own gravitational fields, tend to form themselves into spheres.  Stars are very large spheres.  Atoms are very small ones. 

Now let’s think about Dr. Geller’s galaxies, forming, as they seem, on the surface of bubbles, and all of that dark energy that seems to be at work in our universe.

            Dark energy is antigravity, pushing the mass of the universe away from itself at a rate that creates a flat, not a pulsating universe.  If that is so, would it not then behave as gravity does, only in reverse?  Would dark energy not have spewed from the Big Bang in the same haphazard and pervasive way as did nascent matter?  Would central cores of dark energy not exert a force equally in all directions away from itself?  Would dark energy not form bubbles of antigravity, with the world of matter occupying the skin of those bubbles where dark energy has stretched itself too thin to counteract the positive gravitation of the world of physical mass?   The logic as well as the mathematics fit together neatly. 

This awesome combination of matter, dark matter and dark energy form a delicate equation that turns scientists into philosophers.  It is a pearl of perfection.

The music of the spheres helps me keep the faith.