Seminarium "High Energy, Cosmology and Astro-particle Physics (HECA)"
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2025-04-29 (11:15) 
Sreemanti Chakraborti (IPPP Durham)
Searching Ultralight Axions with Quantum Technology
https://uw-edu-pl.zoom.us/j/96717478185
In this talk, I will discuss axion-like particles (ALP) as dark matter candidates in the "ultralight mass regime". Starting from the ALP Lagrangian at the UV scale, a consistent QFT treatment is required to obtain interactions at low energy. A plethora of quantum sensor experiments has been designed so far to search for very light ALPs that are particularly sensitive to these effects because they probe large values of the decay constant for which running effects become important. In addition, while linear axion interactions are set by its pseudoscalar nature, quadratic interactions are indistinguishable from scalar interactions. This makes the two types of interactions sensitive to different categories of experiments. I will discuss the reach of various experiments exploiting quantum technology via quantum sensors like atomic clocks, optical interferometers, atom interferometers, etc, and microwave cavity-haloscopes. Lastly, I will touch on the nonlinear behaviour of the ALP field close to the surface of the earth and identify the experiments impacted by this effect.
In this talk, I will discuss axion-like particles (ALP) as dark matter candidates in the "ultralight mass regime". Starting from the ALP Lagrangian at the UV scale, a consistent QFT treatment is required to obtain interactions at low energy. A plethora of quantum sensor experiments has been designed so far to search for very light ALPs that are particularly sensitive to these effects because they probe large values of the decay constant for which running effects become important. In addition, while linear axion interactions are set by its pseudoscalar nature, quadratic interactions are indistinguishable from scalar interactions. This makes the two types of interactions sensitive to different categories of experiments. I will discuss the reach of various experiments exploiting quantum technology via quantum sensors like atomic clocks, optical interferometers, atom interferometers, etc, and microwave cavity-haloscopes. Lastly, I will touch on the nonlinear behaviour of the ALP field close to the surface of the earth and identify the experiments impacted by this effect.