Mikko Salo

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Accepted manuscript or preprint versions of the articles may be found below in pdf form. The final versions appear in the indicated journals.

Submitted articles

1. (with L. Oksanen and Rakesh) Rigidity in the Lorentzian Calderón problem with formally determined data. pdf
   

2. (with L. Oksanen and Rakesh) Fixed angle inverse scattering for Riemannian metrics. pdf
   

3. (with P.-Z. Kow and S. Zou) Increasing resolution and instability for linear inverse scattering problems. pdf
   

4. (with K. Krupchyk, S. Ma, S. Sahoo and S. St-Amant) Inverse problems for semilinear Schrödinger equations at large frequency via polynomial resolvent estimates on manifolds. pdf
   

5. (with D. Johansson and J. Nurminen) Inverse problems for semilinear elliptic PDE with a general nonlinearity a(x,u). pdf
   

6. (with M. Mazzucchelli and L. Tzou) A general support theorem for analytic double fibration transforms. pdf
   

7. (with M. Lassas, L. Oksanen, S. Sahoo and A. Tetlow) Coefficient determination for non-linear Schrödinger equations on manifolds. pdf
   

8. The Calderón problem and normal forms. pdf
   

Monographs

9. (with G. Paternain and G. Uhlmann) Geometric inverse problems, with emphasis on two dimensions.
   Monograph published by Cambridge University Press in 2023. This version is free to view and download for personal use only. pdf
   

Articles in refereed scientific journals

10. (with S. Ma and S. Sahoo) The anisotropic Calderón problem at large fixed frequency on manifolds with invertible ray transform.
    J. London Math. Soc. (to appear). pdf
    

11. (with T. Liimatainen) Applications of the Stone-Weierstrass theorem in the Calderón problem.
    Ann. Fenn. Math. (to appear). pdf
    

12. (with P.-Z. Kow and H. Shahgholian) On scattering behavior of corner domains with anisotropic inhomogeneities.
    SIAM J. Math. Anal. 56 (2024), no. 4, 4834-4853. pdf
    

13. (with G. Paternain) The non-Abelian X-ray transform on surfaces.
    J. Diff. Geom. 126 (2024), no. 3, 1185-1205. pdf
    

14. (with P.-Z. Kow and H. Shahgholian) A minimization problem with free boundary and its application to inverse scattering problems.
    Interfaces Free Bound. 26 (2024), no. 3, 415-471. pdf
    

15. (with L. Oksanen, P. Stefanov and G. Uhlmann) Inverse problems for real principal type operators.
    Amer. J. Math. 146 (2024), no. 1, 161-240. pdf
    

16. (with P.-Z. Kow, S. Larson and H. Shahgholian) Quadrature domains for the Helmholtz equation with applications to non-scattering phenomena.
    Potential Anal. 60 (2024), 387-424. pdf
    

17. (with G. Paternain) Carleman estimates for geodesic X-ray transforms.
    Ann. Sci. Éc. Norm. Supér. 56 (2023), no. 5, 1339-1380. pdf
    

18. (with G. Covi and M. de Hoop) Uniqueness in an inverse problem of fractional elasticity.
    Proc. Royal Soc. A 479 (2023), no. 2278, 20230474. pdf
    

19. (with P.-Z. Kow and H. Shahgholian) On positivity sets of Helmholtz solutions.
    Vietnam J. Math. 51 (2023), no. 4, special issue dedicated to Carlos Kenig, 985-994. pdf
    

20. (with S. Ma and L. Potenciano) Fixed angle inverse scattering for sound speeds close to constant.
    SIAM J. Math. Anal. 55 (2023), no. 4, 3420-3456. pdf
    

21. (with S. Sahoo) The linearized Calderón problem for polyharmonic operators.
    J. Diff. Eq. 360 (2023), 407-451. pdf
    

22. (with H. Schlüter) Jacobian of solutions to the conductivity equation in limited view.
    Inverse Problems 39 (2023), no. 2, 025001. pdf
    

23. (with L. Tzou) Inverse problems for semilinear elliptic PDE with measurements at a single point.
    Proc. AMS 151 (2023), 2023-2030. pdf
    

24. (with M. Lassas and T. Liimatainen) The Calderón problem for the conformal Laplacian.
    Comm. Anal. Geom. 30 (2022), no. 5, 1121-1184. pdf
    

25. (with S. Lu and B. Xu) Increasing stability in the linearized inverse Schrödinger potential problem with power type nonlinearities.
    Inverse Problems 38 (2022), no. 6, 065009. pdf
    

26. (with K. Krupchyk and T. Liimatainen) Linearized Calderón problem and exponentially accurate quasimodes for analytic manifolds.
    Adv. Math. 403 (2022), 108362. pdf
    

27. (with S. Ma) Fixed angle inverse scattering in the presence of a Riemannian metric.
    J. Inverse Ill-posed Probl. 30 (2022), no, 4, 495-520. pdf
    

28. (with T. Liimatainen, Y.-H. Lin and T. Tyni) Inverse problems for elliptic equations with fractional power type nonlinearities.
    J. Diff. Eq. 306 (2022), 189-219. pdf
    

29. (with H. Koch and A. Rüland) On instability mechanisms for inverse problems.
    Ars Inveniendi Analytica (2021), no. 7, 93 pp. pdf
    

30. (with H. Shahgholian) Free boundary methods and non-scattering phenomena.
    Res. Math. Sci. 8 (2021), special issue "Transmission eigenvalues and related spectral problems in scattering theory", 58. pdf
    

31. (with C. Meroño and L. Potenciano) The fixed angle scattering problem with a first order perturbation.
    Ann. Henri Poincaré 22 (2021), 3699-3746. pdf
    

32. (with G. Paternain) A sharp stability estimate for tensor tomography in non-positive curvature.
    Math. Z. 298 (2021), 1323-1344. pdf
    

33. (with M. Lassas, T. Liimatainen and Y.-H. Lin) Partial data inverse problems and simultaneous recovery of boundary and coefficients for semilinear elliptic equations.
    Rev. Mat. Iberoamericana 37 (2021), no. 4, 1553-1580. pdf
    

34. (with M. Lassas, T. Liimatainen and Y.-H. Lin) Inverse problems for elliptic equations with power type nonlinearities.
    J. Math. Pures Appl. 145 (2021), 44-82. pdf
    

35. (with Rakesh) Fixed angle inverse scattering for almost symmetric or controlled perturbations.
    SIAM J. Math. Anal. 52 (2020), no. 6, 5467-5499. pdf
    

36. (with D. Dos Santos Ferreira, Y. Kurylev, M. Lassas and T. Liimatainen) The linearized Calderón problem in transversally anisotropic geometries.
    Int. Math. Res. Not. (2020), no. 22, 8729-8765. pdf
    

37. (with P. Angulo, D. Faraco and L. Guijarro) Limiting Carleman weights and conformally transversally anisotropic manifolds.
    Trans. Amer. Math. Soc. 373 (2020), 5171-5197. pdf
    

38. Applications of microlocal analysis in inverse problems.
    Mathematics 8 (2020), no. 7, 1184. pdf
    

39. (with T. Ghosh, A. Rüland and G. Uhlmann) Uniqueness and reconstruction for the fractional Calderón problem with a single measurement.
    J. Funct. Anal. 279 (2020), no. 1, 108505. pdf
    

40. (with Rakesh) The fixed angle scattering problem and wave equation inverse problems with two measurements.
    Inverse Problems 36 (2020), 035005. pdf
    

41. (with T. Ghosh and G. Uhlmann) The Calderón problem for the fractional Schrödinger equation.
    Analysis & PDE 13 (2020), no. 2, 455-475. pdf
    

42. (with C. Meroño and L. Potenciano) Resolvent estimates for the magnetic Schrödinger operator in dimension n ≥ 2.
    Rev. Math. Complutense 33 (2020), 619-641. pdf
    

43. (with M. Lassas and T. Liimatainen) The Poisson embedding approach to the Calderón problem.
    Math. Annalen 377 (2020), 19-67. pdf
    

44. (with A. Rüland) The fractional Calderón problem: low regularity and stability.
    Nonlinear Analysis 193 (2020), special issue "Nonlocal and Fractional Phenomena", 111529. pdf
    

45. (with A. Rüland) Quantitative approximation properties for the fractional heat equation.
    Math. Control Relat. Fields 10 (2020), no. 1, 1-26. pdf
    

46. (with J. Ilmavirta and J. Lehtonen) Geodesic X-ray tomography for piecewise constant functions on nontrapping manifolds.
    Math. Proc. Cambridge Philos. Soc. 168 (2020), no. 1, 29-41. pdf
    

47. (with G. Paternain, G. Uhlmann and H. Zhou) The geodesic X-ray transform with matrix weights.
    Amer. J. Math. 141 (2019), 1707-1750. pdf
    

48. (with B. Harrach and V. Pohjola) Dimension bounds in monotonicity methods for the Helmholtz equation.
    SIAM J. Math. Anal. 51 (2019), no. 4, 2995-3019. pdf
    

49. (with C. Guillarmou and L. Tzou) The linearized Calderón problem on complex manifolds.
    Acta Math. Sinica 35 (2019), special issue in honor of Carlos Kenig, no. 6, 1043-1056. pdf
    

50. (with A. Rüland) Quantitative Runge approximation and inverse problems.
    Int. Math. Res. Not. (2019), no. 20, 6216-6234. pdf
    

51. (with B. Harrach and V. Pohjola) Monotonicity and local uniqueness for the Helmholtz equation.
    Analysis & PDE 12 (2019), no. 7, 1741-1771. pdf
    

52. (with A. Rüland) Exponential instability in the fractional Calderón problem.
    Inverse Problems 34 (2018), no. 4, 045003. pdf
    

53. (with T. Brander, B. Harrach and M. Kar) Monotonicity and enclosure methods for the p-Laplace equation.
    SIAM J. Appl. Math. 78 (2018), no. 2, 742-758. pdf
    

54. (with J. Lehtonen and J. Railo) Tensor tomography on Cartan-Hadamard manifolds.
    Inverse Problems 34 (2018), special issue: 100 years of the Radon transform, no. 4, 044004. pdf
    

55. (with F. Chung, P. Ola and L. Tzou) Partial data inverse problems for Maxwell equations via Carleman estimates.
    Ann. Inst. H. Poincaré Anal. Non Linéaire 35 (2018), no. 3, 605-624. pdf
    

56. (with L. Päivärinta and E. Vesalainen) Strictly convex corners scatter.
    Rev. Mat. Iberoamericana 33 (2017), no. 4, 1369-1396. pdf
    

57. (with V. Julin and T. Liimatainen) p-harmonic coordinates for Hölder metrics and applications.
    Comm. Anal. Geom. 25 (2017), no. 2, 395-430. pdf
    

58. (with F. Chung and L. Tzou) Partial data inverse problems for the Hodge Laplacian.
    Analysis & PDE 10 (2017), no. 1, 43-93. pdf
    

59. (with C. Guo and M. Kar) Inverse problems for p-Laplace type equations under monotonicity assumptions.
    RIMUT 48 (2016), special issue in honor of Giovanni Alessandrini, 79-99. pdf
    

60. (with D. Dos Santos Ferreira, Y. Kurylev and M. Lassas) The Calderón problem in transversally anisotropic geometries.
    J. Eur. Math. Soc. 18 (2016), no. 11, 2579-2626. pdf
    

61. (with T. Liimatainen) Local gauge conditions for ellipticity in conformal geometry.
    Int. Math. Res. Not. (2016), no. 13, 4058-4077. pdf

62. (with J. Ilmavirta) Broken ray transform on a Riemann surface with a convex obstacle.
    Comm. Anal. Geom. 24 (2016), no. 2, 379-408. pdf
    

63. (with C. Guillarmou, G. Paternain and G. Uhlmann) The X-ray transform for connections in negative curvature.
    Comm. Math. Phys. 343 (2016), no. 1, 83-127. pdf
    

64. (with G. Hu and E. Vesalainen) Shape identification in inverse medium scattering problems with a single far-field pattern.
    SIAM J. Math. Anal. 48 (2016), no. 1, 152-165. pdf
    

65. (with G. Paternain and G. Uhlmann) Invariant distributions, Beurling transforms and tensor tomography in higher dimensions.
    Math. Ann. 363 (2015), no. 1, 305-362. pdf
    

66. (with T. Brander and M. Kar) Enclosure method for the p-Laplace equation.
    Inverse Problems 31 (2015), 045001. pdf
    

67. (with M. Lassas and L. Tzou) Inverse problems and invisibility cloaking for FEM models and resistor networks.
    Math. Models Methods Appl. Sci. 25 (2015), no. 2, 309-342. pdf
    

68. (with G. Paternain and G. Uhlmann) On the range of the attenuated ray transform for unitary connections.
    Int. Math. Res. Not. (2015), no. 4, 873-897. pdf
    

69. (with P. Caro) Stability of the Calderón problem in admissible geometries.
    Inverse Probl. Imaging 8 (2014), no. 4, 939-957. pdf
    

70. (with T. Liimatainen) n-harmonic coordinates and the regularity of conformal mappings.
    Math. Res. Lett. 21 (2014), no. 2, 341-361. pdf
    

71. (with G. Paternain and G. Uhlmann) Spectral rigidity and invariant distributions on Anosov surfaces.
    J. Diff. Geom. 98 (2014), no. 1, 147-181. pdf
    

72. (with C. Kenig) Recent progress in the Calderón problem with partial data.
    Contemp. Math. 615 (2014), 193-222. pdf
    

73. (with G. Paternain and G. Uhlmann) Tensor tomography: progress and challenges.
    Chinese Ann. Math. Ser. B 35 (2014), no. 3, 399-428. pdf
    

74. (with D. Dos Santos Ferreira and C. Kenig) On L^p resolvent estimates for Laplace-Beltrami operators on compact manifolds.
    Forum Math. 26 (2014), no. 3, 815-849. pdf
    

75. (with C. Kenig) The Calderón problem with partial data on manifolds and applications.
    Analysis & PDE 6 (2013), no. 8, 2003-2048. pdf
    

76. (with G. Paternain and G. Uhlmann) Tensor tomography on surfaces.
    Invent. Math. 193 (2013), no. 1, 229-247. pdf
    

77. (with D. Dos Santos Ferreira and C. Kenig) Determining an unbounded potential from Cauchy data in admissible geometries.
    Comm. PDE 38 (2013), no. 1, 50-68. pdf
    

78. (with J. Chen, G. Zhao, E. Rahtu and M. Pietikäinen) Automatic dynamic texture segmentation using local descriptors and optical flow.
    IEEE Trans. Image Processing 22 (2013), no. 1, 326-339. pdf
    

79. (with G. Paternain and G. Uhlmann) The attenuated ray transform for connections and Higgs fields.
    Geom. Funct. Anal. 22 (2012), no. 5, 1460-1489. pdf
    

80. (with T. Liimatainen) Nowhere conformally homogeneous manifolds and limiting Carleman weights.
    Inverse Probl. Imaging 6 (2012), no. 3, 523-530. pdf
    

81. (with X. Zhong) An inverse problem for the p-Laplacian: boundary determination.
    SIAM J. Math. Anal. 44 (2012), no. 4, 2474-2495. pdf
    

82. (with C. Kenig and G. Uhlmann) Reconstructions from boundary measurements on admissible manifolds.
    Inverse Probl. Imaging 5 (2011), no. 4, 859-877. pdf
    

83. (with G. Uhlmann) The attenuated ray transform on simple surfaces.
    J. Diff. Geom. 88 (2011), no. 1, 161-187. pdf
    

84. (with C. Guillarmou and L. Tzou) Inverse scattering at fixed energy on surfaces with Euclidean ends.
    Comm. Math. Phys. 303 (2011), no. 3, 761-784. pdf
    

85. (with C. Kenig and G. Uhlmann) Inverse problems for the anisotropic Maxwell equations.
    Duke Math. J. 157 (2011), no. 2, 369-419. pdf
    

86. (with L. Päivärinta and G. Uhlmann) Inverse scattering for the magnetic Schrödinger operator.
    J. Funct. Anal. 259 (2010), no. 7, 1771-1798. pdf
    

87. (with V. Brytik and M. de Hoop) Sensitivity analysis of wave-equation tomography: a multi-scale approach.
    J. Fourier Anal. Appl. 16 (2010), no. 4, 544-589. pdf
    

88. (with L. Tzou) Inverse problems with partial data for a Dirac system: a Carleman estimate approach.
    Adv. Math. 225 (2010), no. 1, p. 487-513. pdf
    

89. (with P. Caro and P. Ola) Inverse boundary value problem for Maxwell equations with local data.
    Comm. PDE 34 (2009), no. 11, p. 1425-1464. pdf
    

90. (with D. Dos Santos Ferreira, C. Kenig, and G. Uhlmann) Limiting Carleman weights and anisotropic inverse problems.
    Invent. Math. 178 (2009), no. 1, p. 119-171. pdf
    

91. (with L. Tzou) Carleman estimates and inverse problems for Dirac operators.
    Math. Ann. 344 (2009), no. 1, p. 161-184. pdf
    

92. Stability for solutions of wave equations with C^{1,1} coefficients.
    Inverse Probl. Imaging 1 (2007), no. 3, p. 537-556. pdf
    

93. (with K. Knudsen) Determining nonsmooth first order terms from partial boundary measurements.
    Inverse Probl. Imaging 1 (2007), no. 2, p. 349-369. pdf
    

94. Semiclassical pseudodifferential calculus and the reconstruction of a magnetic field.
    Comm. PDE 31 (2006), no. 11, p. 1639-1666. pdf
    

95. (with J.-N. Wang) Complex spherical waves and inverse problems in unbounded domains.
    Inverse Problems 22 (2006), no. 6, p. 2299-2309. pdf
    

96. (with E. Rahtu and J. Heikkilä) A new convexity measure based on a probabilistic interpretation of images.
    IEEE Trans. Pattern Analysis and Machine Intelligence 28 (2006), no. 9, p. 1501-1512. pdf
    

97. (with R. Brown) Identifiability at the boundary for first-order terms.
    Appl. Anal. 85 (2006), no. 6-7, p. 735-749. pdf
    

98. (with E. Rahtu and J. Heikkilä) Affine invariant pattern recognition using Multiscale Autoconvolution.
    IEEE Trans. Pattern Analysis and Machine Intelligence 27 (2005), no. 6, p. 908-918. pdf
    

99. Inverse problems for nonsmooth first order perturbations of the Laplacian.
    Ann. Acad. Sci. Fenn. Math. Diss. 139 (2004), 67 pp. pdf

Articles in other scientific journals

100. Rungen lause ja sovelluksia inversio-ongelmiin. (in Finnish)
     Arkhimedes 3 (2018). pdf
     

101. On the work of Joonas Ilmavirta. (translated in Polish)
     Wiadomosci Matematyczne, to appear. pdf
     

102. Konformigeometrian mittaehtoja. (in Finnish)
     Suomalaisen Tiedeakatemian vuosikirja (2015). pdf
     

103. Matka maapallon keskipisteeseen - sädemuunnosten matematiikkaa. (in Finnish)
     Arkhimedes 1-2 (2014), p. 12-18. pdf
     

104. Ihmisen uudet silmät - käänteisten ongelmien matematiikkaa. (in Finnish)
     Solmu 3 (2011), p. 28-30. pdf
     

105. Inversio-ongelmat - matematiikkaa ja sen sovelluksia. (in Finnish)
     Arkhimedes 5 (2006), p. 20-25. pdf
     

Chapters in books and other compilations

106. On geometric inverse problems and microlocal analysis.
     Chapter in Microlocal analysis and inverse problems in tomography and geometry (edited by E. Quinto, P. Stefanov and G. Uhlmann), Radon Series on Computational and Applied Mathematics 30, de Gruyter, 2024. pdf
     

107. Distributions and Fourier transform.
     Chapter in Encyclopedia of Applied and Computational Mathematics (edited by B. Engquist), Springer-Verlag, 2015. pdf
     

108. The Calderón problem on Riemannian manifolds.
     Chapter in Inverse Problems and Applications: Inside Out II (edited by G. Uhlmann), MSRI Publications, Cambridge University Press, 2012. pdf
     

109. Töissä tiedeyhteisössä. (in Finnish)
     Chapter in Letters to a young researcher (edited by M. Paso), Finnish Academy of Science and Letters, 2011. pdf
     

110. (with M. Lassas and G. Uhlmann) Wave imaging.
     Chapter in Handbook of Mathematical Methods in Imaging (edited by O. Scherzer), Springer-Verlag, 2011. pdf
     

Articles in refereed conference proceedings

111. The fractional Calderón problem.
     Journées équations aux dérivées partielles (2017), Exp. No. 7, 8 p. pdf
     

112. (with E. Rahtu, J. Kannala, and J. Heikkilä) Segmenting salient objects from images and videos.
     Proc. European Conference on Computer Vision, ECCV 2010, Lecture Notes in Computer Science 6315, p. 366-379. pdf
     

113. (with E. Rahtu and J. Heikkilä) Compressing sparse feature vectors using random ortho-projections.
     Proc. International Conference on Pattern Recognition, ICPR 2010, p. 1397-1400. pdf
     

114. Inverse boundary value problems for the magnetic Schrödinger equation.
     Proc. Inverse Problems in Applied Sciences - Towards Breakthrough (Sapporo 2006), J. Phys Conf. Series 73 (2007) 012020. pdf
     

115. (with E. Rahtu and J. Heikkilä) Affine registration using multiscale approach.
     Proc. Finnish Signal Processing Symposium, FINSIG 2007. pdf
     

116. (with E. Rahtu and J. Heikkilä) Nonlinear functionals in the construction of multiscale affine invariants.
     Proc. Scandinavian Conference on Image Analysis, SCIA 2007, p. 482-491. pdf
     

117. (with E. Rahtu and J. Heikkilä) Multiscale autoconvolution histograms for affine invariant pattern recognition.
     Proc. British Machine Vision Conference, BMVC 2006, vol. 3, p. 1059-1068. pdf
     

118. (with E. Rahtu and J. Heikkilä) A new affine invariant image transform based on ridgelets.
     Proc. British Machine Vision Conference, BMVC 2006, vol. 3, p. 1039-1048. pdf
     

119. (with J. Kannala and J. Heikkilä) Algorithms for computing a planar homography from conics in correspondence.
     Proc. British Machine Vision Conference, BMVC 2006, vol. 1, p. 77-86. pdf
     

120. (with E. Rahtu, J. Heikkilä, and J. Flusser) Generalized affine moment invariants for object recognition.
     Proc. International Conference on Pattern Recognition, ICPR 2006, vol. 2, p. 634-637. pdf
     

121. (with E. Rahtu and J. Heikkilä) A new efficient method for producing global affine invariants.
     Proc. International Conference on Image Analysis and Processing, ICIAP 2005, p. 407-414. pdf
     

122. (with J. Kannala, E. Rahtu, and J. Heikkilä) A new method for affine registration of images and point sets.
     Proc. Scandinavian Conference on Image Analysis, SCIA 2005, p. 224-234. pdf
     

123. (with E. Rahtu and J. Heikkilä) Convexity recognition using Multi-Scale Autoconvolution.
     Proc. International Conference on Pattern Recognition, ICPR 2004, vol. 1, p. 692-695. pdf