TY - JOUR
T1 - A random first-order transition theory for an active glass
AU - Nandi, Saroj Kumar
AU - Mandal, Rituparno
AU - Bhuyan, Pranab Jyoti
AU - Dasgupta, Chandan
AU - Rao, Madan
AU - Gov, Nir S.
N1 - We thank S. Ramaswamy, P. G. Wolynes, Edan Learner, and S. Sastry for useful discussions. S.K.N. thanks Koshland foundations for funding through a senior postdoctoral fellowship. R.M. Funding Information: acknowledges the Council of Scientific and Industrial Research for financial help and Indian Institute of Science and Simons Center at the National Centre for Biological Sciences for computational resources. N.S.G. is the Author contributions: S.K.N. conceived the project; S.K.N., R.M., M.R., and N.S.G. designed research; S.K.N., R.M., M.R., and N.S.G. performed research; S.K.N., R.M., P.J.B., C.D., M.R., and N.S.G. contributed new reagents/analytic tools; S.K.N., R.M., P.J.B., C.D., M.R., and N.S.G. analyzed data; and S.K.N., R.M., P.J.B., C.D., M.R., and N.S.G. wrote the paper.
PY - 2018/7/24
Y1 - 2018/7/24
N2 - How does nonequilibrium activity modify the approach to a glass? This is an important question, since many experiments reveal the near-glassy nature of the cell interior, remodeled by activity. However, different simulations of dense assemblies of active particles, parametrized by a self-propulsion force, f0, and persistence time, τp, appear to make contradictory predictions about the influence of activity on characteristic features of glass, such as fragility. This calls for a broad conceptual framework to understand active glasses; here, we extend the random first-order transition (RFOT) theory to a dense assembly of self-propelled particles. We compute the active contribution to the configurational entropy through an effective model of a single particle in a caging potential. This simple active extension of RFOT provides excellent quantitative fits to existing simulation results. We find that whereas f0 always inhibits glassiness, the effect of τp is more subtle and depends on the microscopic details of activity. In doing so, the theory automatically resolves the apparent contradiction between the simulation models. The theory also makes several testable predictions, which we verify by both existing and new simulation data, and should be viewed as a step toward a more rigorous analytical treatment of active glass.
AB - How does nonequilibrium activity modify the approach to a glass? This is an important question, since many experiments reveal the near-glassy nature of the cell interior, remodeled by activity. However, different simulations of dense assemblies of active particles, parametrized by a self-propulsion force, f0, and persistence time, τp, appear to make contradictory predictions about the influence of activity on characteristic features of glass, such as fragility. This calls for a broad conceptual framework to understand active glasses; here, we extend the random first-order transition (RFOT) theory to a dense assembly of self-propelled particles. We compute the active contribution to the configurational entropy through an effective model of a single particle in a caging potential. This simple active extension of RFOT provides excellent quantitative fits to existing simulation results. We find that whereas f0 always inhibits glassiness, the effect of τp is more subtle and depends on the microscopic details of activity. In doing so, the theory automatically resolves the apparent contradiction between the simulation models. The theory also makes several testable predictions, which we verify by both existing and new simulation data, and should be viewed as a step toward a more rigorous analytical treatment of active glass.
U2 - https://doi.org/10.1073/pnas.1721324115
DO - https://doi.org/10.1073/pnas.1721324115
M3 - مقالة
C2 - 29987043
SN - 0027-8424
VL - 115
SP - 7688
EP - 7693
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
IS - 30
ER -