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Dark Matter Is Changing & Evolving
By Shlomo Maital
What do we know about our 13.8-billion-year-old universe? A lot – and very little.
We know that 5 per cent of it is comprised of atomic matter – particles. They interact with us, and we can see them, study them, smash them to pieces and examine what comes out. 25 per cent is dark matter – matter that we cannot see, that does not interact with other particles and is invisible. 70 per cent is dark energy – energy that also does not interact with existing matter and so is invisible.
Conclusion: 95% of the universe is a total dark mystery to us. We know this, because if the universe comprised only the matter we observe, its rate of expansion should be slowing as cosmic bodies grow more and more distant from one another and gravity weakens.
Instead, we observed that the universe is expanding – at a faster and faster rate! Only dark matter and dark energy can explain this.
Projecting dozens and hundreds of billions of years into the future, at the current rate the universe goes dark – because objects become too far apart for us to see, and the sun has long ago gone dark, using up its helium.
But wait! There is new evidence, from DESI, dark energy spectroscopic instrument, atop an observatory in Arizona’s desert. Dark energy, it was found, is evolving, changing. It is not constant. So, we could well NOT have the cosmos go dark, but rather, stop expanding, and collapse inward, implode – and cause a new Big Bang.
I envy the physicists. They have the world’s biggest mystery to solve — and I sense their energy and joy at not yet knowing in the least what the universe really is and how it works.
And we humans? Who think we know everything? Not even close.
Rethinking Dark Matter & Dark Energy
By Shlomo Maital
Adam Riess is a Johns Hopkins U. professor of astrophysics and 2011 Nobel Laureate. His research showed that the universe is expanding (Hubble found that years ago), at an increasing rate – which defies the standard laws of gravity, that suggest that as cosmic bodies grow more distant, the force of gravity weakens. This means that there is unobserved dark matter and dark energy out there, which does not interact with conventional matter and energy, and it must be some 95% of existing energy and matter (63% dark energy, 32 percent dark energy).
Riess is part of a team researching the cosmos using the DESI, dark energy spectroscopic instrument. It is located in the Sonora Desert, atop Kitt Peak, in Arizona. It is creating a 3D map of the positions and velocities of 40 million galaxies across 11 billion years of time. The first map just released covers six million galaxies. The director of DESI, Michael Levi, said that “we’re seeing some potentially interesting differences that could indicate that dark energy is evolving with time’.
Riess said about the results that “it may be the first real clue we have gotten about the nature of dark energy in 25 years!”. His words were reported by Dennis Overbye, in the New York Times. Overby covers astrophysics and brilliantly explains complex subjects in a lucid understandable manner.
If the current standard model is true, then the universe will grow darker and darker, as cosmic bodies grow more distant one from another – and eventually, even atoms will rip apart and everything will disintegrate, billions of years from now. But if dark matter and dark energy are evolving, changing in a dynamic manner, well – maybe not.
Perhaps one day, we will actually find a way to observe and understand dark matter and dark energy.
Meanwhile, it is exhilarating to see how astrophysicists are eager and willing to admit that what they thought they knew is not the case. Would that all of us would be so wise.
TIMnovate 