Hypothetical particles are proposed physical entities that extend or modify established particle content in a given theoretical framework, typically introduced to resolve inconsistencies, explain unexplained phenomena, or complete symmetries in high-energy and gravitational physics. As physical systems, they are characterized by well-defined quantum numbers, interaction types, mass scales, and roles in Lagrangian formulations, yet they lack direct experimental confirmation. Examples in model-building include particles postulated in supersymmetry, grand unified theories, dark matter and dark energy models, and quantum gravity scenarios, where their properties are constrained by consistency with known symmetries, renormalizability, cosmological evolution, and precision tests of the Standard Model and general relativity.
Determining the nature of dark matter, the invisible substance that makes up most of the mass in our universe, is one of the greatest puzzles in physics. New results from the world's most sensitive dark matter detector, LUX-ZEPLIN ...
General Physics
Sep 29, 2025
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Dark matter remains one of the biggest mysteries in fundamental physics. Many theoretical proposals (axions, WIMPs) and 40 years of extensive experimental searches have failed to provide any explanation of the nature of dark ...
General Physics
Sep 22, 2025
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About 80% of the universe's mass is thought to consist of dark matter. Yet, little is known about the composition and structure of the particles that make up dark matter, presenting physicists with some fundamental questions. ...
Astronomy
Sep 9, 2025
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65
Physicists from the University of Copenhagen have begun using the gigantic magnetic fields of galaxy clusters to observe distant black holes in their search for an elusive particle that has stumped scientists for decades.
Astronomy
Aug 15, 2025
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274
Quantum computers have the potential to solve problems far beyond the reach of today's fastest supercomputers. But today's machines are notoriously fragile. The quantum bits, or "qubits," that store and process information ...
Quantum Physics
Aug 5, 2025
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976
It is now understood that all known matter, i.e., studied by science and harnessed by technology, constitutes only 5% of the content of the universe. The rest is composed of two unknown components: dark matter (about 27%) ...
General Physics
Jul 30, 2025
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131
Dark matter, a type of matter that does not emit, absorb, or reflect light, is predicted to account for most of the universe's mass. While theoretical predictions hint at its abundance, detecting this elusive matter has so ...
The ongoing search for dark matter, the elusive type of matter that does not emit, absorb or reflect light and is estimated to account for most of the universe's mass, has not yet yielded conclusive results. Axions, hypothetical ...
As federal funding cuts impact decades of research, scientists could turn to black holes for cheaper, natural alternatives to expensive facilities searching for dark matter and similarly elusive particles that hold clues ...
Astronomy
Jun 3, 2025
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211
A new study has revealed a novel effect caused by dark photons—hypothetical particles thought to make up a portion of the universe's elusive dark matter. This discovery, made within the framework of Einstein–Cartan–Holst ...
General Physics
Jun 3, 2025
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