New Study Expands Search for "Dark Photons," a Leading Dark Matter Candidate

A new study claims that dark photons would not have heated the early Universe as previously thought. The research, led by Professor Anson Hook of the Maryland Center for Fundamental Physics, was conducted in collaboration with researchers from the Perimeter Institute for Theoretical Physics. The findings suggest that dark photons could be hiding in more places than previously thought, potentially altering the search for dark matter. The study was published in Physical Review Letters. The research team ran simulations that showed the standard linear conversion theory was incomplete. Instead, the simulations indicated that once dark photon energy enters the plasma, the system becomes violently nonlinear, and the conversion process would have shut down before significant heating could occur. This challenges previous assumptions about the energy conversion process and could open new possibilities for searching for dark matter.

• The study was part of a cross-disciplinary research effort led by Professor Anson Hook.
• The research team included Senior Postdoctoral Researcher Junwu Huang and Horizon AstroPhysics Initiative Fellow Mohamad Shalaby.
• The research results are published in Physical Review Letters.
• The study claims that dark photons would not have converted into ordinary light in the early Universe, unlike previously thought.
• The research team ran simulations that showed the standard linear conversion theory was incomplete.
• The simulations indicated that once dark photon energy enters the plasma, the system becomes violently nonlinear, and the conversion process would have shut down before significant heating could occur.
• The research team found that the conventional cosmological constraint on dark photons is invalid across roughly ten orders of magnitude.
• The constraint ranges from frequencies of about 10⁻¹⁵ electron volts (eV) to 10⁻⁶ eV, corresponding to the kilohertz and gigahertz parts of the radio spectrum.
• The research suggests that the treatment for the last 15 years is a linear treatment, which may not be accurate for real-world systems.
• The research could open new avenues in cosmological studies and help in the search for other elusive particles.
• The research highlights the importance of interdisciplinary collaboration between plasma physics and particle physics.

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