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Dark Matter and Dark Energy… the Same Thing?

Dr. Zhao
I’ve said it many times, but it bears repeating: regular matter only accounts for 4% of the Universe. The other 96% – dark matter and dark energy – is a total mystery. Wouldn’t it be convenient if we could find a single explanation for both? Astronomers from the University of St. Andrews are ready to decrease the mysteries down to one.

Dr. HongSheng Zhao at the University of St. Andrews School of Physics and Astronomy has developed a model that shows how dark energy and dark matter are more closely linked than previously thought.

Dr Zhao points out, “Both dark matter and dark energy could be two faces of the same coin. “As astronomers gain understanding of the subtle effects of dark energy in galaxies in the future, we will solve the mystery of astronomical dark matter at the same time.”

Just a quick explainer. Dark energy was discovered in the late 1990s during a survey of distant supernova. Instead of finding evidence that the mutual gravity of all the objects in the Universe is slowing down its expansion, researchers discovered that its expansion is actually accellerating.

Dark matter was first theorized back in 1933 by Swiss astronomer Fritz Zwicky. He noted that galaxies shouldn’t be able to hold themselves together with just the regular matter we can see. There must be some additional, invisible matter surrounding the regular matter that provides the additional gravitational force to hold everything together.

And since their discoveries plenty of additional evidence for both dark energy and dark matter have been seen across the Universe.

In Dr. Zhao’s model, dark energy and dark matter the same thing that he calls a “dark fluid”. On the scale of galaxies, this fluid behaves like matter, providing a gravitational force. And in the large scales, the fluid helps drive the expansion of the Universe.

Dr. Zhao’s model is detailed enough to produce the same 3:1 ratio of dark energy to dark matter measured by cosmologists.

Of course, any theory like this only gains ground when it starts making predictions that can be tested through observation. Dr. Zhao expects the work at the Large Hadron Collider to be fruitless. If he’s right, dark matter particles will have such low energy that the collider won’t be able to generate them.

The paper was recently published in the Astrophysical Journal Letters in December 2007, and Physics Review D. 2007.

Original Source: University of St. Andrews News Release


Fraser Cain is the publisher of Universe Today. He's also the co-host of Astronomy Cast with Dr. Pamela Gay.

Comments on this entry are closed.

  • Unnamed September 20, 2008, 12:56 AM

    FWIW…Chuck Lam’s explanation matches that found in the Urantia Book’s chapter “Energy, Mind and Matter “(printed 1955… electronic version can be downloaded free)

  • Ahmad Sujadi October 21, 2008, 11:16 AM

    If big bang had been making full of rotating objects, that must from random rotating bang center. Propagation galaxies must be one of this another random rotating seem like foams are happen in ocean of the dark matter. You know that pulsar or galaxy have planar rotating on 2 dimension, but center of big bang must have many rotating in space-time.

  • Nirmalendu Das November 24, 2008, 5:52 AM

    I want to say that we know the Structure of atom, but do not know that how many photons are present in an atom in the form of energy? No one can give answer of this question as Planck constant that E = h? is the energy of some packet of photons. Again, I can ask question that how many photons are present in E when E = mc2? or what is the internal function of m when m is acting with c2 ? In what way the particle is producing energy in the form of photons? What is the structure of electron, EMR? In what way the Universe was created? What is the actual form of it? Lot of questions are there. I solved it and published book as given here: 1) Mystery of Origin of the Universe (1990), 2) Complete Unified Theory (1998).
    But scientists are trying to establish the Dark matter and Dark energy. What is the mass of it? With out mass we can not think about energy. If E = mc2 is not obeying this rule, then why Einstein equation? Why matter, Why energy? Are matter occupies in the Dark space? What is the utility of dark matter? Is Dark energy can solve the birth of the Universe? If Dark matter and Dark energy are in together, then is it possible to write ED x MD = MD2 x c2 = (MD x c) 2 , it is showing the momentum of the particle. Thus the dark matter is not able to form energy until unless it functioned in the form of E = mc2. Again what is the mass of a Dark matter? Without knowing the mass, it is not possible to find the energy of it. So, no need to think over it, until we not know the accurate mass of a photon which is very practical. We can say, without light we see dark only. Light or photon is the all source of energy. At first it is require finding the mass of a photon accurately. The group of scientists or investigators are trying to find out the mass of photon experimentally, but obtained results are not tallying with other investigators. So, it is in the dark till now. I calculated the mass of a photon accurately and written in my book mentioned above. You can get my comments and hints on the complete unified theory / Mystery of origin of the universe from the website given bellow:
    1) SAO/NASA ADS Astronomy (ABSTRACT: A scholarly treatise on the mass of photon or its properties which has been the source of many discoveries regarding the matter (Universe).
    2) nirmalgopa@Everything2.com, 3) Experiments at CERN help us understand the world we live in …, 4) books search- The Library, The Abdus Salam International Centre …, 5) Scientists break the speed of light – Business – iTnews Australia, 6) Amazon.co.uk: Mystery of origin of the universe, 7) SB Berlin PK – Search Short List-[ Translate ], Andy Evans. … Complete unified theory / Nirmalendu Das. – 1. ed. …, 8) Table of Contents I-001 Microwave Applications in
    File Format: PDF/Adobe Acrobat – View as HTML S-005 The Mass of a Photon is the Key of all Source of Energy & the Result of Complete Unified. Theory; It can Explain the Structure of Electron, …
    Website -http://unifiedtheorynirmalendudas.synthasite.com
    Thank you Universe.
    Dated: 24/11/2008 Nirmalendu Das, Siliguri, West Bengal, INDIA

  • Nirmalendu Das March 5, 2009, 7:12 PM

    The Head of the Authority of NASA,


    Kindly go through this page for the benefit of the scientific world.

    As per different report received from Internet that NASA is doing lot of scientific works on physics & astrophysics. It requires to more improve on the subject of the creation of the universe. I want to give suggestion that you may go through “Mystery of Origin of the Universe” and “Complete Unified Theory” written by me and totally scientific work in which NASA can get many information and may discover that in what way particle, stars, etc can give energy; in what way the particles, stars, galaxies, universe created. We know that Einstein energy equation is E = mc2, but do not know that what is the internal function of m with effect of c2 during emission of energy E ? You cannot answer of this from our traditional theories. But you can get answer of this from my books. Also we do not know about “Unification of Physics” and “Complete Unified Theory” till now, scientists are trying for this from 1873, many theories like string, super symmetry, GUT, Big Bang etc came into the picture, but no theory can explain abut the creation of the actual form of the particle, universe. With the help of single theory “Complete Unified Theory”, it is possible to explain all phenomena from the particle to the universe. I found that the quantum circulation of Black Hole is 3.0440727×10-26 m2 / sec , mass of a photon is 1.65961×10-54 gram; it can explain the structure of electron and can define the structure of electromagnetic radiation. There are till unknown to us. Likewise, lot of things is there which are most interesting.

    You can search this book from Websites. So if you want to do work on this subject, may contact me.
    Email: nirmalgopa@yahoo.co.in , Mob: India 09475089337

    Dated: 06-03-2009 Yours faithfully,
    Nirmalendu Das

  • Laszlo GYORIK March 31, 2009, 4:22 AM

    When solomon was dedicating the Temple to GOD, he says that our God dwells in the THICK DARKNESS. Is it possible that Dark Matter is a celestial curtain that hides Heaven just as there was a curtain that hid the Tabernacle within the Earthly Temple.

  • Laszlo GYORIK April 2, 2009, 6:13 AM

    More thougts on a celestial curtain.
    This dark matter takes up most of the universe,does it have gravity?If not,how comes that it can bend light?any thoughjts anybody.

  • Steve April 15, 2009, 3:17 PM

    Greg, said “These concepts still seem a bit far fetched to me and I, like many others, would like to see either of these detected and measured for the first time before I am satisfied that everyone is on the right track. A little bit of reserved judgement and skepticism is always healthy. I always find it amusing how cosmologists can become absolutist when someone questions the existance of these entities which have yet to be independently observed and measured. To such people I ask is this a religion or a scientific dicipline?”

    I’m requoting so much of what he says because he says it well. I really enjoy the physics theories. I get a little weirded out, though, when physicists (or journalists) start quoting them as being simiply true. It may be a long time before we understand such things. And we need to keep open the possibility that we may never understand such things. A bunch of creatures with three-pound brains, located at what is essentially a single point in an astonishingly vast continuum, may have neither the opportunity nor the wherewithal to observe or explain all aspects of the cosmos. A little humility might be wise.

  • eric ahlstrom April 19, 2009, 8:58 PM

    If you ask me Dark energy/matter is actually the finger prints of the super-strings that existed at the time of the Big Bang.