Ethan Siegel: Why does empty space have the properties that it does? Why is the zero-point energy of the fabric of the Universe a positive, non-zero value? And why does dark energy have the behavior we observe it to have, rather than any other?
Sabine Hossenfelder: Given how much brain-power physicists have spent on trying to figure out what dark matter and dark energy is, I think it would be a good idea to definitely settle the question whether it is anything at all. At the very least, I would sleep better.
Siegel: In order for inflation to end, that energy has to get converted into matter and radiation. The evidence strongly points to that happening some 13.8 billion years ago.
Rob Sheldon: This article illustrates the reason why the scientific method is going extinct, not just in Darwin’s circular logic, but also in physics and cosmology.
If the results had been at all positive, the presser would have likely said “Confirmation!!!!” or something like that. Seeing as the new results are neutral or faintly negative, “closing in” is the best they can manage.
Hossenfelder’s clarifications will at least help us understand what we are all confused about.
The authors hope that their work will “pave the way for methods of testing string theory.” That could come in handy, you never know.
At Horizons EU we are told, “New efforts to figure out just how fast the universe has expanded since the Big Bang, a speed known as the Hubble constant, could upend current theories of physics , according to some scientists. If current theories were upended, who would know. Consider these stories from this month alone: […]
That’s dark energy.topic The most mysterious phenomenon in cosmology – dark energy – may not exist at all, according to Professor Subir Sarkar, head of the particle theory group at the University of Oxford in the UK. In the late 1990s, astronomers found evidence from supernovae that the universe has been expanding faster and faster […]
Dark energy. Even the name is intriguing. Isn’t it a line of cosmetics already? But the evidence base is getting murkier all the time. The conjecture, if true, would mean the density of dark energy in our universe cannot be constant, but must instead take a form called “quintessence” — an energy source that will […]
From ScienceDaily: One of the candidates for ‘dark energy’ is the symmetron field. Researchers have developed an experiment capable of measuring extremely small forces with the help of neutrons. The measurements could have provided pointers to the mysterious symmetrons, but the particles didn’t show up. This excludes the possibility of symmetrons in a broad parameter […]