Seminario. Sreemanti Chakraborti (Durham University, England)

Title: _Quantum Technology Searches for Ultralight Axions

Sreemanti Chakraborti
(Durham University, England)

Abstract:
In this talk, I will discuss axion-like particles (ALPs) as dark matter
candidates in the ultralight mass regime. Starting from the ALP
Lagrangian at the UV scale, a consistent quantum field theory treatment
is required to derive the relevant low-energy interactions. A wide range
of quantum sensor experiments have been proposed to search for such
particles, particularly those probing large values of the axion decay
constant where running effects become significant.
While linear ALP couplings are constrained by their pseudoscalar nature,
quadratic interactions are indistinguishable from those of a scalar. As
a result, the two types of couplings are probed by distinct experimental
strategies. I will present the reach of various quantum sensor
platforms, including atomic clocks, optical and atom interferometers,
and microwave cavity haloscopes. Finally, I will comment on the
nonlinear behaviour of the ALP field near the Earth’s surface and
identify the classes of experiments that could be impacted by this
feature. 
 

Fecha: viernes, 30 de mayo de 2025
Hora:   12:00 horas
Lugar: Seminario de Física Teórica