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The probability of unusually large components in the near-critical Erdős–Rényi graph

  • Matthew I. Roberts (a1)


The largest components of the critical Erdős–Rényi graph, G(n, p) with p = 1 / n, have size of order n 2/3 with high probability. We give detailed asymptotics for the probability that there is an unusually large component, i.e. of size an 2/3 for large a. Our results, which extend the work of Pittel (2001), allow a to depend upon n and also hold for a range of values of p around 1 / n. We also provide asymptotics for the distribution of the size of the component containing a particular vertex.


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* Postal address: Department of Mathematical Sciences, University of Bath, Bath BA2 7AY, UK. Email address:


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[1] Addario-Berry, L., Broutin, N. and Goldschmidt, C. (2010). Critical random graphs: limiting constructions and distributional properties. Electron. J. Prob. 15, 741775.
[2] Addario-Berry, L., Broutin, N. and Goldschmidt, C. (2012). The continuum limit of critical random graphs. Prob. Theory Relat. Fields 152, 367406.
[3] Aïdékon, E., van der Hofstad, R., Kliem, S. and van Leeuwaarden, J. S. H. (2016). Large deviations for power-law thinned Lévy processes. Stoch. Process. Appl. 126, 13531384.
[4] Aldous, D. (1997). Brownian excursions, critical random graphs and the multiplicative coalescent. Ann. Prob. 25, 812854.
[5] Bender, E. A., Canfield, E. R. and McKay, B. D. (1990). The asymptotic number of labeled connected graphs with a given number of vertices and edges. Random Structures Algorithms 1, 127169.
[6] Bet, G., van der Hofstad, R. and van Leeuwaarden, J. S. H. (2014). Heavy-traffic analysis through uniform acceleration of queues with diminishing populations. Preprint. Available at
[7] Bhamidi, S., van der Hofstad, R. and van Leeuwaarden, J. S. H. (2010). Scaling limits for critical inhomogeneous random graphs with finite third moments. Electron. J. Prob. 15, 16821702.
[8] Bollobás, B. (2001). Random Graphs (Camb. Stud. Adv. Math. 73), 2nd edn. Cambridge University Press.
[9] Bollobás, B. and Riordan, O. (2012). Asymptotic normality of the size of the giant component via a random walk. J. Combin. Theory B 102, 5361.
[10] Dembo, A., Levit, A. and Vadlamani, S. (2017). Component sizes for large quantum Erdős–Rényi graph near criticality. To appear in Ann. Prob.
[11] Dhara, S., van der Hofstad, R., van Leeuwaarden, J. S. H. and Sen, S. (2017). Critical window for the configuration model: finite third moment degrees. Electron. J. Prob. 22, 16.
[12] Durrett, R. (2007). Random Graph Dynamics. Cambridge University Press.
[13] Erdős, P. and Rényi, A. (1959). On random graphs. I. Publ. Math. Debrecen 6, 290297.
[14] Erdős, P. and Rényi, A. (1960). On the evolution of random graphs. Publ. Math. Inst. Hung. Acad. Sci A 5, 1761.
[15] Erdős, P. and Rényi, A. (1961). On the evolution of random graphs. II. Bull. Inst. Internat. Statist. 38, 343347.
[16] Janson, S. (2007). Brownian excursion area, Wright's constants in graph enumeration, and other Brownian areas. Prob. Surveys 4, 80145.
[17] Janson, S., Łuczak, T. and Rucinski, A. (2000). Random Graphs. John Wiley, New York.
[18] Joseph, A. (2014). The component sizes of a critical random graph with given degree sequence. Ann. Appl. Prob. 24, 25602594.
[19] Łuczak, T. (1990). On the number of sparse connected graphs. Random Structures Algorithms 1, 171173.
[20] Łuczak, T., Pittel, B. and Wierman, J. C. (1994). The structure of a random graph at the point of the phase transition. Trans. Amer. Math. Soc. 341, 721748.
[21] Nachmias, A. and Peres, Y. (2010). The critical random graph, with martingales. Israel J. Math. 176, 2941.
[22] O'Connell, N. (1998). Some large deviation results for sparse random graphs. Prob. Theory Relat. Fields 110, 277285.
[23] Pittel, B. (2001). On the largest component of the random graph at a nearcritical stage. J. Combin. Theory B 82, 237269.
[24] Riordan, O. (2012). The phase transition in the configuration model. Combin. Prob. Comput. 21, 265299.
[25] Robbins, H. (1955). A remark on Stirling's formula. Amer. Math. Monthly 62, 2629.
[26] Roberts, M. and Şengül, B. (2017). Exceptional times of the critical dynamical Erdős–Rényi graph. To appear in Ann. Appl. Prob.
[27] Steif, J. E. (2009). A survey of dynamical percolation. In Fractal Geometry and Stochastics IV, Birkhäuser, Basel, pp. 145174.
[28] Van der Hofstad, R. and Spencer, J. (2006). Counting connected graphs asymptotically. Europ. J. Combinatorics 27, 12941320.
[29] Van der Hofstad, R., Janssen, A. J. E. M. and van Leeuwaarden, J. S. H. (2010). Critical epidemics, random graphs, and Brownian motion with a parabolic drift. Adv. Appl. Prob 42, 11871206.
[30] Van der Hofstad, R., Kager, W. and Müller, T. (2009). A local limit theorem for the critical random graph. Electron. Commun. Prob. 14, 122131.
[31] Van der Hofstad, R., Kliem, S. and van Leeuwaarden, J. S. H. (2014). Cluster tails for critical power-law inhomogeneous random graphs. Preprint. Available at
[32] Van der Hofstad, R., van Leeuwaarden, J. S. H. and Stegehuis, C. (2016). Mesoscopic scales in hierarchical configuration models. Preprint. Available at
[33] Voblyĭ, V. A. (1987). Wright and Stepanov–Wright coefficients. Mat. Zametki 42, 854862.
[34] Wright, E. M. (1980). The number of connected sparsely edged graphs. III. Asymptotic results. J. Graph Theory 4, 393407.


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