S. Ramaswamy, The Mechanics and Statistics of Active Matter, Annual Review of Condensed Matter Physics, vol.1, issue.1, p.323, 2010.
DOI : 10.1146/annurev-conmatphys-070909-104101

I. D. Couzin and J. Krause, Advances in the Study of, Behavior, vol.32, issue.1, 2003.

J. Buhl, From Disorder to Order in Marching Locusts, Science, vol.312, issue.5778, p.1402, 2006.
DOI : 10.1126/science.1125142

X. Chen, Scale-Invariant Correlations in Dynamic Bacterial Clusters, Physical Review Letters, vol.108, issue.14, p.148101, 2012.
DOI : 10.1103/PhysRevLett.108.148101

J. Deseigne, O. Dauchot, and H. Chaté, Collective Motion of Vibrated Polar Disks, Physical Review Letters, vol.105, issue.9, p.98001, 2010.
DOI : 10.1103/PhysRevLett.105.098001
URL : https://hal.archives-ouvertes.fr/hal-01422397

J. Deseigne, S. Léonard, O. Dauchot, and H. Chaté, Vibrated polar disks: spontaneous motion, binary collisions, and collective dynamics, Soft Matter, vol.62, issue.20, p.5629, 2012.
DOI : 10.1039/c2sm25186h
URL : https://hal.archives-ouvertes.fr/hal-01422387

J. Toner and Y. Tu, Model: How Birds Fly Together, Physical Review Letters, vol.75, issue.23, pp.4326-4828, 1995.
DOI : 10.1103/PhysRevLett.75.4326

J. Toner, Reanalysis of the hydrodynamic theory of fluid, polar-ordered flocks, Physical Review E, vol.86, issue.3, p.31918, 2012.
DOI : 10.1103/PhysRevE.86.031918

S. Ramaswamy, R. A. Simha, and J. Toner, Active nematics on a substrate: Giant number fluctuations and long-time tails, Europhysics Letters (EPL), vol.62, issue.2, p.196, 2003.
DOI : 10.1209/epl/i2003-00346-7

I. S. Aranson and L. S. Tsimring, Pattern formation of microtubules and motors: Inelastic interaction of polar rods, Physical Review E, vol.71, issue.5, p.50901, 2005.
DOI : 10.1103/PhysRevE.71.050901

E. Bertin, M. Droz, and G. Grégoire, Boltzmann and hydrodynamic description for self-propelled particles, Physical Review E, vol.74, issue.2, p.22101, 2006.
DOI : 10.1103/PhysRevE.74.022101
URL : https://hal.archives-ouvertes.fr/hal-00910408

A. Baskaran and M. C. Marchetti, Hydrodynamics of self-propelled hard rods, Physical Review E, vol.77, issue.1, pp.11920-268101, 2008.
DOI : 10.1103/PhysRevE.77.011920

S. Mishra, A. Baskaran, and M. C. Marchetti, Fluctuations and pattern formation in self-propelled particles, Physical Review E, vol.81, issue.6, p.61916, 2010.
DOI : 10.1103/PhysRevE.81.061916

T. Ihle, Kinetic theory of flocking: Derivation of hydrodynamic equations, Physical Review E, vol.83, issue.3, p.30901, 2011.
DOI : 10.1103/PhysRevE.83.030901

A. Cavagna, Scale-free correlations in starling flocks, Proceedings of the National Academy of Sciences, vol.107, issue.26, p.11865, 2010.
DOI : 10.1073/pnas.1005766107

P. G. De-gennes and J. Prost, The Physics of Liquid Crystals (Oxford: Clarendon, 1993.

C. A. Weber, F. Thuroff, and E. Frey, Role of particle conservation in self-propelled particle systems, New Journal of Physics, vol.15, issue.4, p.45014, 2013.
DOI : 10.1088/1367-2630/15/4/045014

T. Vicsek, Novel Type of Phase Transition in a System of Self-Driven Particles, Physical Review Letters, vol.75, issue.6, p.1226, 1995.
DOI : 10.1103/PhysRevLett.75.1226

G. Grégoire and H. Chaté, Onset of Collective and Cohesive Motion, Physical Review Letters, vol.92, issue.2, p.25702, 2004.
DOI : 10.1103/PhysRevLett.92.025702

H. Chaté, Collective motion of self-propelled particles interacting without cohesion, Physical Review E, vol.77, issue.4, p.46113, 2008.
DOI : 10.1103/PhysRevE.77.046113

F. Ginelli, F. Peruani, M. Bär, and H. Chaté, Large-Scale Collective Properties of Self-Propelled Rods, Physical Review Letters, vol.104, issue.18, p.184502, 2010.
DOI : 10.1103/PhysRevLett.104.184502
URL : https://hal.archives-ouvertes.fr/hal-00905223

A. Peshkov, I. S. Aranson, E. Bertin, H. Chaté, and F. Ginelli, Nonlinear Field Equations for Aligning Self-Propelled Rods, Physical Review Letters, vol.109, issue.26, p.268701, 2012.
DOI : 10.1103/PhysRevLett.109.268701
URL : https://hal.archives-ouvertes.fr/hal-00910349

H. Chaté, F. Ginelli, and R. Montagne, Simple Model for Active Nematics: Quasi-Long-Range Order and Giant Fluctuations, Physical Review Letters, vol.96, issue.18, p.180602, 2006.
DOI : 10.1103/PhysRevLett.96.180602

E. Bertin, H. Chaté, F. Ginelli, S. Mishra, A. Peshkov et al., Mesoscopic theory for fluctuating active nematics, New Journal of Physics, vol.15, issue.8, p.85032, 2013.
DOI : 10.1088/1367-2630/15/8/085032
URL : https://hal.archives-ouvertes.fr/hal-00910354

M. Ballerini, Interaction ruling animal collective behavior depends on topological rather than metric distance: Evidence from a field study, Proceedings of the National Academy of Sciences, vol.105, issue.4, p.1232, 2008.
DOI : 10.1073/pnas.0711437105

F. Ginelli and H. Chaté, Relevance of Metric-Free Interactions in Flocking Phenomena, Physical Review Letters, vol.105, issue.16, p.168103, 2010.
DOI : 10.1103/PhysRevLett.105.168103

A. Peshkov, S. Ngo, E. Bertin, H. Chaté, and F. Ginelli, Continuous Theory of Active Matter Systems with Metric-Free Interactions, Physical Review Letters, vol.109, issue.9, p.98101, 2012.
DOI : 10.1103/PhysRevLett.109.098101
URL : https://hal.archives-ouvertes.fr/hal-00910347

J. Caussin, A. Solon, A. Peshkov, H. Chaté, T. Dauxois et al., Emergent Spatial Structures in Flocking Models: A Dynamical System Insight, Physical Review Letters, vol.112, issue.14, p.148102, 2014.
DOI : 10.1103/PhysRevLett.112.148102
URL : https://hal.archives-ouvertes.fr/ensl-01136812

E. Carlen, R. Chatelin, P. Degond, and B. Wennberg, Kinetic hierarchy and propagation of chaos in biological swarm models, Physica D: Nonlinear Phenomena, vol.260, p.90, 2013.
DOI : 10.1016/j.physd.2012.05.013
URL : https://hal.archives-ouvertes.fr/hal-00965155

E. Carlen, P. Degond, and B. Wennberg, KINETIC LIMITS FOR PAIR-INTERACTION DRIVEN MASTER EQUATIONS AND BIOLOGICAL SWARM MODELS, Mathematical Models and Methods in Applied Sciences, vol.23, issue.07, p.1339, 2013.
DOI : 10.1142/S0218202513500115
URL : https://hal.archives-ouvertes.fr/hal-00625542

A. Peshkov, Boltzmann-Ginzburg-Landau approach for simple models of active matter, 2013.

L. Chen, N. Goldenfeldn, and Y. Oono, Renormalization group and singular perturbations: Multiple scales, boundary layers, and reductive perturbation theory, Physical Review E, vol.54, issue.1, p.376, 1996.
DOI : 10.1103/PhysRevE.54.376

T. Hanke, C. A. Weber, and E. Frey, Understanding collective dynamics of soft active colloids by binary scattering, Physical Review E, vol.88, issue.5, p.52309, 2013.
DOI : 10.1103/PhysRevE.88.052309

F. D. Farrell, J. Tailleur, D. Marenduzzo, and M. C. Marchetti, Pattern Formation in Self-Propelled Particles with Density-Dependent Motility, Physical Review Letters, vol.108, issue.24, p.248101, 2012.
DOI : 10.1103/PhysRevLett.108.248101
URL : https://hal.archives-ouvertes.fr/hal-00749041

R. Grossmann, L. Schimansky-geier, and P. Romanczuk, Self-propelled particles with selective attraction???repulsion interaction: from microscopic dynamics to coarse-grained theories, New Journal of Physics, vol.15, issue.8, p.85014, 2013.
DOI : 10.1088/1367-2630/15/8/085014