  The study of the Unruh effect naturally raises the interest for a deeper
understanding of the analogy between temperature and acceleration. A recurring
question is whether an accelerated frame can be distinguished from an inertial
thermal bath in pure thermodynamic experiments, such problem has been
approached in the literature and a consensus is yet to be fully reached. In the
present work we use the open quantum system formalism to investigate the case
where both acceleration and background temperature are present. We find the
asymptotic state density and entanglement generation from the Markovian
evolution of accelerated qubits interacting with a thermal state of the
external scalar field. Our results suggest that there is a very small asymmetry
on the effects of the Unruh and background temperatures. Addressing the nonzero
background temperature case is of both theoretical and phenomenological
interest, thus the authors hope to enrich the existing discussions on the
topic.
