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Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2021, Tutors: Alberto Fernández-Nieves, Ramon Planet

# metadata.dc.description.abstract[].value
We know a lot about the behaviour of matter on equilibrium. In particular, we know ﬂuctuations follow the central limit theorem. In contrast, only recently have we began to really understand how out of equilibrium active matter behaves. Here, we use ﬁre ants and explore the relationship between ant number ﬂuctuations and system size. We do this for two distinct ant states: a collective active state and a preferentially non-active state. We ﬁnd that while ﬂuctuations in the predominantly non-active state are similar to ﬂuctuations in equilibrium systems, in the collective active there are giant number ﬂuctuations