English Version

                                                  YAVAR KIAN

Professor, Laboratoire de Mathématiques Raphaël Salem (LMRS), UMR 6085 

Université de Rouen Normandie

UFR des Sciences et Techniques Université de Rouen Normandie

Avenue de l'Université, BP.12 76801 Saint-Étienne-du-Rouvray, France

yavar.kian@univ-rouen.fr

Google Scholar: https://scholar.google.fr/citations?user=lpk20vUAAAAJ&hl=fr

ORCID: https://orcid.org/0000-0002-5588-3600


CV: see here

Main research topics

My main research topics are:

Keywords:  Wave equations,  Schrödinger equations,  heat equations, elliptic equations,  inverse problems, Carleman estimates, Calderón problems, time fractional diffusion equations, inverse spectral problems, stability estimates for inverse problems, Strichartz estimates.

Thesis

Equations des ondes avec des perturbations dépendantes du temps,  defended on 23/11/2010. pdf

Habilitation 

Etude de problèmes inverses et directs pour différentes équations aux dérivées partielles,  (in english) defended on 15/11/2017. pdf

Publications and preprints

 

Determination of time-dependent coefficients for evolution PDE (hyperbolic, parabolic, Schrödinger)


1) Stability of the determination of a time-dependent coefficient in parabolic equations, (with Mourad Choulli), MCRF, 3 (2013), 143-160. pdf

2) A stability result for a time-dependent potential in a cylindrical domain, (with Patricia Gaitan), Inverse Problems, 29 (2013), 065006.

3) Stable Determination of Time-Dependent Scalar Potential From Boundary Measurements in a Periodic Quantum Waveguide, (with Mourad Choulli and Eric Soccorsi) , SIAM J.Math. Anal., 47 (6) (2015), 4536-4558. pdf

4) Stable Determination of Time-Dependent Scalar Potential From Boundary Measurements in a Periodic Quantum Waveguide, (with Mourad Choulli and Eric Soccorsi) , New Prospects in Direct, Inverse and Control Problems for Evolution Equations, A. Favini, G. Fragnelli and R. M. Mininni (Eds), Springer-INdAM, Roma, 2014, 93-105.

5) Unique determination of a time-dependent coefficient from partial data, Annales de l'IHP (C) Analyse non linéaire, 34 (2017), 973-990. pdf

6) Stability in the determination of a time-dependent coefficient for wave equations from partial data, Journal of Mathematical Analysis and Applications, 436 (2016), 408-428. pdf

7) Recovery of time-dependent damping coefficients and potentials appearing in wave equations from partial data, SIAM J. Math. Anal., 48(6) (2016), 4021-4046. pdf

8) Logarithmic stability in determining the time-dependent zero order coefficient in a parabolic equation from a partial Dirichlet-to-Neumann map. Application to the determination of a nonlinear term, (with Mourad Choulli), J. Math. Pures Appl., 114 (2018),235-261. pdf

9) Recovery of time-dependent coefficient on Riemannian manifold for hyperbolic equations, (with Lauri Oksanen), IMRN, 2019 (2019), 5087–5126. pdf

10) Hölder stably determining the time-dependent electromagnetic potential of the Schrödinger equation, (with Eric Soccorsi), SIAM J. Math. Anal., 51 (2019), 627-647. pdf

11) Determination of singular time-dependent coefficients for wave equations from full and partial data, (with Ganghui Hu), Inverse Probl. Imaging, 12 (2018), 745-772. pdf

12) Determination of convection terms and quasi-linearities appearing in diffusion equations, (with Pedro Caro), preprint, (2018). pdf

13) Recovery of time dependent coefficients from boundary data for hyperbolic equations, (with Ali Feizmohammadi, Joonas Ilmavirta, Lauri Oksanen), Journal of Spectral Theory, 11 (2021), 1107-1143.  pdf

14) Hölder Stable Recovery of Time-Dependent Electromagnetic Potentials Appearing in a Dynamical Anisotropic Schrödinger Equation, (with Alexander Tetlow), Inverse Probl. Imaging, 14 (2020), 819-839. pdf

15) Recovery of non-smooth coefficients appearing in anisotropic wave equations, (with Ali Feizmohammadi), SIAM J. Math. Anal., 51 (2019), 4953-4976. pdf

16) Recovery of non-smooth coefficients appearing in anisotropic wave equations, (with Ali Feizmohammadi),  Asymptotic Analysis, 131 (2023), 513-539. pdf


Inverse problems for nonlinear equations


8) Logarithmic stability in determining the time-dependent zero order coefficient in a parabolic equation from a partial Dirichlet-to-Neumann map. Application to the determination of a nonlinear term, (with Mourad Choulli), J. Math. Pures Appl., 114 (2018),235-261. pdf

12) Determination of convection terms and quasi-linearities appearing in diffusion equations, (with Pedro Caro), preprint. pdf

17) On the determination of nonlinear terms appearing in semilinear hyperbolic equations,J. London Math. Soc.104 (2021), 572-595.. pdf

 18) Partial data inverse problems for quasilinear conductivity equations, (with Katya Krupchyk, Gunther Uhlmann), Math. Ann., 385 (2023), 1611-1638. pdf

 19) Recovery of nonlinear terms for reaction diffusion equations from boundary measurement, (with Gunther Uhlmann), Arch. Rational Mech. Anal., 247 (2023), https://doi.org/10.1007/s00205-022-01831-y. pdf

20) The Calderón inverse problem for isotropic quasilinear conductivities, (with Cătălin I. Cârstea, Ali Feizmohammadi, Katya Krupchyk, Gunther Uhlmann), Advances in Mathematics, 391 (2021),  107956. pdf

21) An inverse problem for a quasilinear convection--diffusion equation, (with Ali Feizmohammadi and Gunther Uhlmann), Nonlinear Analysis: Theory, Methods & Applications, 222 (2022), 112921. pdf

22) Lipschitz and Hölder stable determination of nonlinear terms for elliptic equations,  Nonlinearity, 36 (2023), 1302-1322. pdf

23) On determining and breaking the gauge class in inverse problems for reaction-diffusion equations, (with T. Liimatainen, Y-H. Lin), preprint. pdf

24) Rigidity of inverse problems for nonlinear elliptic equations on manifolds, (with A. Feizmohammadi and L. Oksanen), preprint. pdf


Fractional diffusion equations


25) On existence and uniqueness of solutions for semilinear fractional wave equations, (with Masahiro Yamamoto) Fractional Calculus and Applied Analysis, 20 (2017), 117-138. pdf

26) Global uniqueness in an inverse problem for time fractional diffusion equations, (with Lauri Oksanen, Eric Soccorsi, Masahiro Yamamoto), Journal of Differential Equations, 264 (2018), 1146-1170. pdf

27) On time-fractional diffusion equations with space-dependent variable order, (with Eric Soccorsi and Masahiro Yamamoto), Annales Henri Poincaré, 19 (2018), 3855-3881. pdf

28) Initial-boundary value problem for distributed order time-fractional diffusion equations, (with Zhiyuan Li, Eric Soccorsi),  Asymptotic Analysis, 115 (2019), 95-126. pdf

29) Asymptotic estimates of solutions to time-fractional diffusion equations with space-dependent variable order, (with Diomba Sambou, Eric Soccorsi), preprint, (2019). pdf

 30) The uniqueness of inverse problems for a fractionalequation with a single measurement, (with Zhiyuan Li, Yikan Liu, Masahiro Yamamoto), Math. Ann.,  380 (2021), 1465-1495. pdf

31) Identification of time-varying source term in time-fractional diffusion equations, (with  E. Soccorsi, Q. Xue, M. Yamamoto), Communication in Mathematical Sciences, 20 (2022), 53-84. pdf

32) Well-posedness for weak and strong solutions of non-homogeneous initial boundary value problems for fractional diffusion equations, (with  M. Yamamoto), Fract. Calc. Appl. Anal., 24 (2021),  168-201. pdf

33)  Simultaneous determination of different class of parameters for a diffusion equation from a single measurement, Inverse Problems, 38 (2022), 075008. pdf

34) Recovery of the Order of Derivation for Fractional Diffusion Equations in an Unknown Medium, (with Bangti Jin), SIAM J. Appl. Math., 82 (2022),  1045-1067. pdf

35) Reconstruction of a space-time dependent source in subdiffusion models via a perturbation approach, (with Bangti Jin and Z. Zhou), SIAM J. Math. Anal. , 53 (2021), 4445-4473. pdf

36) Recovering multiple fractional orders in time-fractional diffusion in an unknown medium, (with Bangti Jin), Proceedings of the Royal Society A, 477 (2021), 20210468. pdf

37) Uniqueness of Inverse Source Problems for General Evolution Equations, (with Yikan Liu, Masahiro Yamamoto), Commun. Contemp. Math.,  25 (2023),   Article ID 2250009, 33 p.. pdf

38) The enclosure method for the detection of variable order in fractional diffusion equations, (with Masaru Ikehata), Inverse Probl. Imaging, 17 (2023), 180-202.

39) Recovery of a distributed order fractional derivative in an unknown medium, (with Bangti Jin), to appear in Communication in Mathematical Sciences. pdf

40) Inverse problems for subdiffusion from observation at an unknown terminal time, (with B. Jin and Z. Zhou), to appear in SIAM J. Appl. Math.. pdf

41) Logarithmic stable recovery of the source and the initial state of time fractional diffusion equations, (with Eric Soccorci and Faouzi Triki), to appear in SIAM J. Math. Anal.. pdf

42)  Equivalence of definitions of solutions for some class of fractional diffusion equations,  to appear in Mathematische Nachrichten, DOI: 10.1002/mana.202100617. pdf

43) Inverse source problem with a posteriori boundary measurement for fractional diffusion equations, (with Jaan Janno), to appear in Mathematical Methods in the Applied Sciences, DOI: 10.1002/mma.9432. pdf


Application to imaging problems


44) Determination of source and initial values for acoustic equations with a time-fractional attenuation, (with X. Huang, E. Soccorsi, M. Yamamoto), to appear in Analysis and Application, DOI: 10.1142/S0219530523500100. pdf

45) Determination of the sound speed and an initial source in photoacoustic tomography, (with Gunther Uhlmann),  preprint. pdf


Inverse spectral problems


46) Heat trace asymptotics and compactness of isospectral potentials for the Dirichlet Laplacian, (with Mourad Choulli, Laurent Kayser and Eric Soccorsi), Asymptotic Analysis, 92 (2015), 259–278. pdf

47) Uniqueness and stability results for an inverse spectral problem in a periodic waveguide, (with Otared Kavian and Eric Soccorsi) , J. Math. Pures Appl., 104 (2015), 1160-1189. pdf

48) A multidimensional Borg-Levinson theorem for magnetic Schrödinger operators with partial spectral data, Journal of Spectral Theory, 8 (2018), 235–269. pdf

49) A Borg-Levinson theorem for magnetic Schrödinger operators on a Riemannian manifold, (with M. Bellassoued, M. Choulli, D. D. Feirrera, P. Stefanov), Ann. Inst. Fourier, 71 (2021),  2471-2517. pdf

50) Identification of unbounded electric potentials through asymptotic boundary spectral data, (with M. Bellassoued,Y. Mannoubi, E. Soccorsi), preprint, arXiv:2201.05414.



Inverse problems using boundary control method


51) Application of the boundary control method to partial data Borg-Levinson inverse spectral problem, (with Morgan Morancey and Lauri Oksanen), (2017), MCRF, 9 (2019),  289-312. pdf

52) Unique recovery of lower order coefficients for hyperbolic equations from data on disjoint sets, (with Yaroslav Kurylev, Matti Lassas and Lauri Oksanen), Journal of Differential Equations, 267 (2019), no. 4, 2210-2238. pdf



Calderón problem


53) Double logarithmic stability estimate in the identification of a scalar potential by a partial elliptic Dirichlet-to-Neumann map, (with Mourad Choulli and Eric Soccorsi), In memory of Alfredo Lorenzi, Bulletin SUSU MMCS, 8 (3) (2015), 78-94. pdf

54) Stability result for elliptic inverse periodic coefficient problem by partial Dirichlet-to-Neumann map, (with Mourad Choulli, Eric Soccorsi), Journal of Spectral Theory, 8 (2) (2018), 733-768. pdf

55) On the Calderon problem in periodic cylindrical domain with partial Dirichlet and Neumann data, (with Mourad Choulli, Eric Soccorsi), Mathematical Methods in the Applied Sciences, 40 (2017), 5959–5974. pdf

56) Recovery of non compactly supported coefficients of elliptic equations on an infinite waveguide , Journal of the Institute of Mathematics of Jussieu, 19 (2020), 1573-1600. pdf

57) Determination of non-compactly supported electromagnetic potentials in unbounded closed waveguide,  Revista Matemática Iberoamericana, 36 (2020), 671-710.. pdf

58) Stable recovery of non-compactly supported electromagnetic potentials in unbounded domain,  (with Yosra Soussi),  Mathematical Methods in the Applied Sciences, 44 (2021), 13421-13447.




Inverse problems on an infinite waveguide


59) Carleman estimate for infinite cylindrical quantum domains and application to inverse problems, (with Quang Sang Phan and Eric Soccorsi), Inverse Problems, 30 (2014), 055016. pdf

60) Hölder stable determination of a quantum scalar potential in unbounded cylindrical domains, (with Quang Sang Phan and Eric Soccorsi), Journal of Mathematical Analysis and Applications, 426 (2015), 194-210. pdf

61) Stability of the determination of a coefficient for wave equations in an infinite waveguide, Inverse Probl. Imaging, 8 (3) (2014), 713-732. pdf

62) An inverse stability result for non compactly supported potentials by one arbitrary lateral Neumann observation, (with Mourad Bellassoued and Eric Soccorsi), Journal of Differential Equations, 260 (2016), 7535-7562. pdf

63) An inverse problem for the magnetic Schrödinger equation in infinite cylindrical domains, (with Mourad Bellassoued and Eric Soccorsi), Publications of the Research Institute for Mathematical Sciences, 54 (2018), 679-728. pdf



Inverse source problem


64) Determination of time dependent factors of coefficients in fractional diffusion equation, (with Kenichi Fujishiro), MCRF, 6 (2016), 251-269. pdf 

65) Logarithmic stability inequality in an inverse source problem for the heat equation on a waveguide, (with Diomba Sambou and Eric Soccorsi), Applicable Analysis, 99 (2020), 2210-2228.. pdf 

66) Inverse source problems in elastodynamics, (with Gang Bao, Ganghui Hu, Tao Yin), Inverse Problems, 34 (4) (2018), 045009. pdf

67) Uniqueness and stability for the recovery of a time-dependent source in elastodynamics, (with Ganghui Hu) Inverse Probl. Imaging., 14 (2020), 463-487. pdf

68) Inverse moving source problems in electrodynamics, (with Ganghui Hu, Peijun Li, Yue Zhao) Inverse Problems, 35 (2019), 075001 . pdf

69) Reconstruction and stable recovery of source terms appearing in diffusion equations, (with Masahiro Yamamoto), Inverse Problems, 35 (2019), 115006. pdf

70) Uniqueness to some inverse source problems for the wave equation in unbounded domains, (with G. Hu and Y. Zaho), Acta Mathematicae Applicatae Sinica, English Series, Vol. 36, No. 1 (2020) 134-150. pdf

71) Inverse parabolic problems of determining functions with one spatial-component independence by Carleman estimate,  (with O. Y. Imanuvilov and M. Yamamoto), J. Inverse Ill-Posed Probl., 30 (2022), 191-203. 


Estimate of solutions of hyperbolic equations


72) Global Strichartz estimates for the wave equation with a time-periodic non-trapping metric, Asymptotic Analysis, 68 (2010), 41-76. pdf

73) Cauchy problem for semilinear wave equation with time-dependent metrics, Nonlinear Analysis:Theory, Methods and Applications, 73 (2010), 2204-2212. pdf

74) Local energy decay in even dimensions for the wave equation with a time-periodic non-trapping metric and applications to Strichartz estimates, Serdica Math. J., 36 (2010), 329-370. pdf

75) Local energy decay for the wave equation with a time-periodic non-trapping metric and moving obstacle, CUBO, 3 (2012), 153-173. pdf

76) On the meromorphic continuation of the resolvent for the wave equation with time-periodic perturbations and applications, preprint (2011). pdf