Photons, according to the standard model came from the cooling of the quark-gluon plasma (which only has certain similarities with the plasma you are more familiar with) - which allowed hadronic matter to form.
Well, if you're trying to 'simplify' this creation of matter process to a SINGLE type of energy that is contained inside all forms of matter, I would agree that the simple photon would probably suffice. I mean if you're going to claim that electrons and positrons are created by light, you might as well go all the way and claim that protons and neutrons are simply collections of positron and electrons arranged in some group configuration. The matter/antimatter collider experiments produced other subatomic particles just by slamming electrons and protons together at high speed.
I'm always amazed at this point that crusading atheists like Krauss can claim with a straight face, or even believe that the universe has zero net energy. There could NEVER have been a time in all of eternity when 'energy' did not exist in some form or another. Atheistic memes are just strange IMO.
Sure we can, by that standard. Space itself would appear to be the source of dark energy, by your standard - that you can go and 'get some' electrons and photons from an atom.
Wow, talk about metaphysical mumbo-jumbo. "Space" isn't even physically defined. "Spacetime" is described and defined by GR, but the gaps between matter don't PRODUCE energy, they simply are points in spacetime that existing energy traverses.
How do I empirically verify that 'space' produces magic unicorns, or dark invisible gnomes, or "dark energy" here on Earth? I mean if you claimed that magnetic fields were created by the flow of current, you'd have no problem demonstrating that claim in a lab. Something powerful enough to accelerate an entire universe would surely be able to move a couple atoms in a lab, right?
Actually, for the neutrinos, you probably already have some - inside you. They won't hang about for long though...and you couldn't contain the ones from the nuclear reactor either. In fact, you couldn't observe the neutrino at all, only the paths of the mesons produced by the collisions the neutrinos had with protons...
The point is that they do in fact exist inside of me right now by the billions and they are detectable by standard empirical physics. We can identify a known source of them. We can 'control' that source as well and thereby verify the cause/effect link between transmitter and receiver.
You can't even identify a PHYSICAL source because "space" isn't PHYSICALLY defined in the first place!
Where can you go "get" some potential energy
Pick up a rock.
Let go of it now and watch it fall to the ground. That's how potential energy is converted into kinetic energy on Earth.
It would seem from your statements that you think dark energy is like a liquid, or a solid, or something you can put in a box - are you grasping the concept of energy?
I grasp the concept of PARTICLE KINETIC ENERGY like neutrinos and EM fields and such. I understand potential energy, spacetime curvature/gravity and many other things that actually show up in the lab. Neutrinos for instance are ultimately just a form of particle kinetic energy with an identifiable source. Ditto for EM fields. Their carrier particle is the (virtual) photon, a particle that carries simple kinetic energy from one location to another. We can "create" EM fields with ordinary current, again establishing cause/effect connections is no problem in the lab. I don't have a CLUE what "dark energy" might be, how to acquire it, use it, manipulate it or "create" some in any way/shape or form, and neither does anyone else on this planet. It's apparently a complete dud in the lab, akin to any 'religion' based on a "deistic' deity.
In terms of a physical description - what is your physical description of potential energy, for example? Just so I know what your standard is...
I can demonstrate it on Earth with a simple rock.
WMAP, and observations of type A supernovae - two independent observations based on different scientific ideas - yield very close approximations to how much of the universe should be dark energy, which is why the 70% number seems about right.
But as those 'tired light' papers demonstrate, a simple scattering effect explains those same observations WITHOUT magic energy. Which is the "simpler" explanation?