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Femtoscopy measures space-time characteristics of the particle emittingsource created in relativistic heavy-ion collisions. It is argued thatcollective behavior of matter (radial flow) produces specific femtoscopicsignatures. The one that is best known, the m_T dependence of the pion ``HBTradii'', can be explained by the alternative scenario of temperature gradientsin an initial state thermal model. We identify others that can invalidate suchalternatives, such as non-identical particle correlations and m_T scaling forparticles of higher mass. Studies with a simple rescattering code show that asthe interaction cross-section is increased the system develops collectivebehavior and becomes more thermalized at the same time, the two effects beingthe natural consequence of increased number of particle rescatterings.Repeating calculations with a more realistic rescattering model confirmed allof these conclusions and provided deeper insight into the mechanisms ofcollectivity buildup, showing a preference for a thermal model with uniformtemperature.

Femtoscopic signatures of collective behavior as a probe of the thermal nature of relativistic heavy ion collisions