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01769 am a22002653u 4500 |
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|a Solon, Alexandre P.
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|a Massachusetts Institute of Technology. Department of Physics
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|a Kardar, Mehran
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|a Stenhammar, Joakim
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|a Wittkowski, Raphael
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|a Kardar, Mehran
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|a Kafri, Yariv
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|a Cates, Michael E.
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|a Tailleur, Julien
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|a Pressure and Phase Equilibria in Interacting Active Brownian Spheres
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|b American Physical Society,
|c 2015-05-12T12:21:28Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/96959
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|a We derive a microscopic expression for the mechanical pressure P in a system of spherical active Brownian particles at density ρ. Our exact result relates P, defined as the force per unit area on a bounding wall, to bulk correlation functions evaluated far away from the wall. It shows that (i) P(ρ) is a state function, independent of the particle-wall interaction; (ii) interactions contribute two terms to P, one encoding the slow-down that drives motility-induced phase separation, and the other a direct contribution well known for passive systems; and (iii) P is equal in coexisting phases. We discuss the consequences of these results for the motility-induced phase separation of active Brownian particles and show that the densities at coexistence do not satisfy a Maxwell construction on P.
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|a Engineering and Physical Sciences Research Council (Grant EP/J007404)
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|a National Science Foundation (U.S.) (Grant NSF PHY11-25925)
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|a en
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|a Article
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|t Physical Review Letters
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