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High Energy Physics
A new measurement offers insights on the density of the mysterious force driving the Universe's expansion.
Physicists have yet to pinpoint the hypothetical matter that keeps galaxies from flying apart. Now they have a new focus.
In our Universe, matter is made of particles, while antimatter is made of antiparticles. But sometimes, the physical lines get real blurry.
U.S. particle physicists recently recommended a list of major research projects that they hope will receive federal funding.
In the early stages of the hot Big Bang, matter and antimatter were (almost) balanced. After a brief while, matter won out. Here's how.
In the very early Universe, practically all particles were massless. Then the Higgs symmetry broke, and suddenly everything was different.
In the earliest stages of the hot Big Bang, equal amounts of matter and antimatter should have existed. Why aren't they equal today?
When the hot Big Bang first occurred, the Universe reached a maximum temperature never recreated since. What was it like back then?
Scientists will be able to make detailed "Claymation-like" movies of chemical reactions.
A massive nuclear fusion experiment just hit a major milestone, potentially putting us a little closer to a future of limitless clean energy.
Light can be turned into heat, which can then be turned into motion, and the effect of that motion can be turned into a big squeeze.
In our Universe, all stable atomic nuclei have protons in them; there's no stable "neutronium" at all. But what's the reason why?
Isaac Newton and Albert Einstein are locked in an eternal battle over the nature of gravity. Whose side are you on?
From unexplained tracks in a balloon-borne experiment to cosmic rays on Earth, the unstable muon was particle physics' biggest surprise.
Neutrons can be stable when bound into an atomic nucleus, but free neutrons decay away in mere minutes. So how are neutron stars stable?
Positron emission tomography (PET) scans use positrons — the antimatter equivalent of an electron — to locate cancer in the body.
There may be unknown particles lurking inside the quantum foam.
Even with the quantum rules governing the Universe, there are limits to what matter can withstand. Beyond that, black holes are unavoidable.
The hunt for the elusive particles continues.
The familiar terrain of solids, liquids, and gases gives way to the exotic realms of plasmas and degenerate matter.
If we waited long enough, would even protons themselves decay? The far future stability of the Universe depends on it.
The brightest gamma-ray burst ever observed, GRB 221009A behaved in unexpected ways that might help us understand how they occur.
Gamma-ray bursts are so powerful they could vaporize the Earth from 200 light-years away. Recreating them in the lab is not easy.
The concept of ‘relativistic mass’ has been around almost as long as relativity has. But is it a reasonable way to make sense of things?
Particle physicists use gigantic accelerators to investigate the infinitesimal.
Einstein's most famous equation is E = mc², which describes the rest mass energy inherent to particles. But motion matters for energy, too.
The LHC has a long, productive life ahead of it. An upgraded version, called the “High Luminosity LHC,” will be available in 2028.
You are an energy field — but not the “chakras” or “auras” kind.
When white dwarfs explode, they create a type Ia supernovae. After decades of following the leading theory, here's the complete overhaul!
Gamma-ray bursts are among the most energetic cosmic events of all. On October 9, 2022, a remarkable one occurred: the brightest ever seen.