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June  2015, 8(2): 309-333. doi: 10.3934/krm.2015.8.309

## On the homogeneous Boltzmann equation with soft-potential collision kernels

 1 Department of Mathematics, College of Natural Sciences, Chung-Ang University, 84 Heukseok-Ro, Dongjak-Gu, Seoul 156-756

Received  August 2014 Revised  January 2015 Published  March 2015

We consider the well-posedness problem for the space-homogeneous Boltzmann equation with soft-potential collision kernels. By revisiting the classical Fourier inequalities and fractional integrals, we deduce a set of bilinear estimates for the collision operator on the space of integrable functions possessing certain degree of smoothness and we apply them to prove the local-in-time existence of a solution to the Boltzmann equation in both integral form and the original one. Uniqueness and stability of solutions are also established.
Citation: Yong-Kum Cho. On the homogeneous Boltzmann equation with soft-potential collision kernels. Kinetic and Related Models, 2015, 8 (2) : 309-333. doi: 10.3934/krm.2015.8.309
##### References:
 [1] R. Alexandre, L. Desvillettes, C. Villani and B. Wennberg, Entropy dissipation and long-range interactions, Arch. Ration. Mech. Anal., 152 (2000), 327-355. doi: 10.1007/s002050000083. [2] L. Arkeryd, On the Boltzmann equation, Part I: Existence, Part II: The full initial value problem, Arch. Rational Mech. Anal., 45 (1972), 1-16. [3] L. Arkeryd, Intermolecular forces of infinite range and the Boltzmann equation, Arch. Rational Mech. Anal., 77 (1981), 11-21. doi: 10.1007/BF00280403. [4] F. Bouchut and L. Desvillettes, A proof of the smoothing properties of the positive part of Boltzmann's kernel, Rev. Mat. Iberoamericana, 14 (1998), 47-61. doi: 10.4171/RMI/233. [5] A. V. Bobylev, Fourier transform method in the theory of the Boltzmann equation for Maxwell molecules, Dokl. Akad. Nauk SSSR, 225 (1975), 1041-1044. [6] E. Carlen, M. Carvalho and X. Lu, On strong convergence to equilibrium for the Boltzmann equation with soft potentials, J. Stat. Phys., 135 (2009), 681-736. doi: 10.1007/s10955-009-9741-1. [7] C. Cercignani, R. Illner and M. Pulvirenti, The Mathematical Theory of Dilute Gases, Springer-Verlag, New York, 1994. doi: 10.1007/978-1-4419-8524-8. [8] Y.-K. Cho and H. Yun, On the gain of regularity for the positive part of Boltzmann collision operator associated with soft potentials, Kinetic and Related Models, 5 (2012), 769-786. doi: 10.3934/krm.2012.5.769. [9] L. Desvillettes and C. Mouhot, Stability and uniqueness for the spatially homogeneous Boltzmann equation with long-range interactions, Arch. Rational Mech. Anal., 193 (2009), 227-253. doi: 10.1007/s00205-009-0233-x. [10] N. Fournier and G. Héléne, On the uniqueness for the spatially homogeneous Boltzmann equation with a strong angular singularity, J. Stat. Phys., 131 (2008), 749-781. doi: 10.1007/s10955-008-9511-5. [11] L. Grafakos, On multilinear fractional integrals, Studia Math., 102 (1992), 49-56. [12] T. Goudon, On Boltzmann equations and Fokker-Planck asymptotics: Influence of grazing collisions, J. Stat. Phys., 89 (1997), 751-776. doi: 10.1007/BF02765543. [13] C. Kenig and E. M. Stein, Multilinear estimates and fractional integration, Math. Research Letters, 6 (1999), 1-15. doi: 10.4310/MRL.1999.v6.n1.a1. [14] P.-L. Lions, Compactness in Boltzmann's equation via Fourier integral operators and applications, I, II, J. Math. Kyoto Univ., 34 (1994), 391-427, 429-461. [15] X. Lu and Y. Zhang, On nonnegativity of solutions of the Boltzmann equation, Transport Theor. Stat., 30 (2001), 641-657. doi: 10.1081/TT-100107420. [16] S. Mischler and B. Wennberg, On the spatially homogeneous Boltzmann equation, Ann. Inst. Henri Poincaré, 16 (1999), 467-501. doi: 10.1016/S0294-1449(99)80025-0. [17] C. Mouhot and C. Villani, Regularity theory for the spatially homogeneous Boltzmann equation with cut-off, Arch. Rational Mech. Anal., 173 (2004), 169-212. doi: 10.1007/s00205-004-0316-7. [18] K. T. Smith, Primer of Modern Analysis, Springer-Verlag, New York, 1983. [19] E. M. Stein, Singular Integrals and Differentiabilty Properties of Functions, Princeton Univ. Press, 1970. [20] E. M. Stein, Harmonic Analysis: Real-Variable Methods, Orthogonality, and Oscillatory Integrals, Princeton Univ. Press, 1993. [21] C. Villani, On a new class of weak solutions to the spatially homogeneous Boltzmann and Landau equations, Arch. Rational Mech. Anal., 143 (1998), 273-307. doi: 10.1007/s002050050106. [22] C. Villani, A review of mathematical topics in collisional kinetic theory, in Handbook of Mathematical Fluid Dynamics, Vol. I, North-Holland, Amsterdam, 2002, 71-305. doi: 10.1016/S1874-5792(02)80004-0.

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##### References:
 [1] R. Alexandre, L. Desvillettes, C. Villani and B. Wennberg, Entropy dissipation and long-range interactions, Arch. Ration. Mech. Anal., 152 (2000), 327-355. doi: 10.1007/s002050000083. [2] L. Arkeryd, On the Boltzmann equation, Part I: Existence, Part II: The full initial value problem, Arch. Rational Mech. Anal., 45 (1972), 1-16. [3] L. Arkeryd, Intermolecular forces of infinite range and the Boltzmann equation, Arch. Rational Mech. Anal., 77 (1981), 11-21. doi: 10.1007/BF00280403. [4] F. Bouchut and L. Desvillettes, A proof of the smoothing properties of the positive part of Boltzmann's kernel, Rev. Mat. Iberoamericana, 14 (1998), 47-61. doi: 10.4171/RMI/233. [5] A. V. Bobylev, Fourier transform method in the theory of the Boltzmann equation for Maxwell molecules, Dokl. Akad. Nauk SSSR, 225 (1975), 1041-1044. [6] E. Carlen, M. Carvalho and X. Lu, On strong convergence to equilibrium for the Boltzmann equation with soft potentials, J. Stat. Phys., 135 (2009), 681-736. doi: 10.1007/s10955-009-9741-1. [7] C. Cercignani, R. Illner and M. Pulvirenti, The Mathematical Theory of Dilute Gases, Springer-Verlag, New York, 1994. doi: 10.1007/978-1-4419-8524-8. [8] Y.-K. Cho and H. Yun, On the gain of regularity for the positive part of Boltzmann collision operator associated with soft potentials, Kinetic and Related Models, 5 (2012), 769-786. doi: 10.3934/krm.2012.5.769. [9] L. Desvillettes and C. Mouhot, Stability and uniqueness for the spatially homogeneous Boltzmann equation with long-range interactions, Arch. Rational Mech. Anal., 193 (2009), 227-253. doi: 10.1007/s00205-009-0233-x. [10] N. Fournier and G. Héléne, On the uniqueness for the spatially homogeneous Boltzmann equation with a strong angular singularity, J. Stat. Phys., 131 (2008), 749-781. doi: 10.1007/s10955-008-9511-5. [11] L. Grafakos, On multilinear fractional integrals, Studia Math., 102 (1992), 49-56. [12] T. Goudon, On Boltzmann equations and Fokker-Planck asymptotics: Influence of grazing collisions, J. Stat. Phys., 89 (1997), 751-776. doi: 10.1007/BF02765543. [13] C. Kenig and E. M. Stein, Multilinear estimates and fractional integration, Math. Research Letters, 6 (1999), 1-15. doi: 10.4310/MRL.1999.v6.n1.a1. [14] P.-L. Lions, Compactness in Boltzmann's equation via Fourier integral operators and applications, I, II, J. Math. Kyoto Univ., 34 (1994), 391-427, 429-461. [15] X. Lu and Y. Zhang, On nonnegativity of solutions of the Boltzmann equation, Transport Theor. Stat., 30 (2001), 641-657. doi: 10.1081/TT-100107420. [16] S. Mischler and B. Wennberg, On the spatially homogeneous Boltzmann equation, Ann. Inst. Henri Poincaré, 16 (1999), 467-501. doi: 10.1016/S0294-1449(99)80025-0. [17] C. Mouhot and C. Villani, Regularity theory for the spatially homogeneous Boltzmann equation with cut-off, Arch. Rational Mech. Anal., 173 (2004), 169-212. doi: 10.1007/s00205-004-0316-7. [18] K. T. Smith, Primer of Modern Analysis, Springer-Verlag, New York, 1983. [19] E. M. Stein, Singular Integrals and Differentiabilty Properties of Functions, Princeton Univ. Press, 1970. [20] E. M. Stein, Harmonic Analysis: Real-Variable Methods, Orthogonality, and Oscillatory Integrals, Princeton Univ. Press, 1993. [21] C. Villani, On a new class of weak solutions to the spatially homogeneous Boltzmann and Landau equations, Arch. Rational Mech. Anal., 143 (1998), 273-307. doi: 10.1007/s002050050106. [22] C. Villani, A review of mathematical topics in collisional kinetic theory, in Handbook of Mathematical Fluid Dynamics, Vol. I, North-Holland, Amsterdam, 2002, 71-305. doi: 10.1016/S1874-5792(02)80004-0.
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