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              <p>In two dimensions, a system of self-gravitating particles collapses and forms a singularity in finite time below a critical temperature T$_c$. We investigate experimentally a quasi-two-dimensional cloud of cold neutral atoms in interaction with two pairs of perpendicular counterpropagating quasiresonant laser beams, in order to look for a signature of this ideal phase transition: indeed, the radiation pressure forces exerted by the laser beams can be viewed as an anisotropic, and nonpotential, generalization of two-dimensional self-gravity. We first show that our experiment operates in a parameter range which should be suitable to observe the collapse transition. However, the experiment unveils only a moderate compression instead of a phase transition between the two phases. A three-dimensional numerical simulation shows that both the finite small thickness of the cloud, which induces a competition between the effective gravity force and the repulsive force due to multiple scattering, and the atomic losses due to heating in the third dimension contribute to smearing the transition.</p>
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          <idno type="ROR">https://ror.org/01tgyzw49</idno>
          <orgName>National University of Singapore</orgName>
          <orgName type="acronym">NUS</orgName>
          <desc>
            <address>
              <addrLine>21 Lower Kent Ridge Rd, Singapour 119077</addrLine>
              <country key="SG"/>
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            <ref type="url">http://www.nus.edu.sg/</ref>
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