Critical quasi-linear Schr\"{o}dinger system with p-Laplacian
Pith reviewed 2026-06-27 12:39 UTC · model grok-4.3
The pith
Positive solutions to the critical quasi-linear Schrödinger system with p-Laplacian are radially symmetric, unique up to translation, and fully classified.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
We obtain the uniqueness and complete classification of positive solutions to the D^{1,p}(R^N)-critical quasi-linear Schrödinger system with p-Laplacian for 1 < p < N. All positive solutions are radially symmetric and strictly decreasing about some point, extending the corresponding uniqueness results known for the case p = 2.
What carries the argument
Regularity theory combined with sharp asymptotic estimates followed by the method of moving planes to establish symmetry and uniqueness for the critical system.
Load-bearing premise
The exponents alpha and beta must satisfy the exact scaling relation that makes the nonlinearity critical with respect to the D^{1,p} Sobolev norm.
What would settle it
Exhibiting either a positive solution that fails to be radially symmetric about any point or two positive solutions not related by a spatial translation would contradict the classification.
read the original abstract
In this paper, we mainly consider positive solution to the $D^{1,p}(\R^{N})$-critical quasi-linear Schr\"{o}dinger system with $p$-Laplacian: \begin{equation*}\begin{cases} -\Delta_p u = u^{\alpha}v^{\beta} \, \ \ \ \ \ \text{in}\,\ \ \R^N, \\ -\Delta_p v = u^{\beta}v^{\alpha} \,\ \ \ \ \ \text{in}\,\ \ \R^N, \end{cases}\end{equation*} where $1<p<N$, $N\geq2$, $0\leq \alpha \leq \beta,$ and $u,v\in D^{1,p}(\R^N)$. We establish regularity and the sharp estimates on asymptotic behaviors for any positive solution $(u,v)$. Then, we prove that all positive solutions are radially symmetric and strictly decreasing about some point. Furthermore, we obtain the uniqueness and complete classification of positive solutions. Our results extend the uniqueness results in \cite{LM,QS} for $p=2$ to general cases $1<p<N$.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper studies positive solutions (u,v) in D^{1,p}(R^N) to the quasilinear system -Δ_p u = u^α v^β, -Δ_p v = u^β v^α in R^N, under the assumptions 1 < p < N, N ≥ 2, 0 ≤ α ≤ β. It claims to prove regularity, sharp asymptotic estimates at infinity, radial symmetry and strict monotonicity about some point via moving planes or similar, and finally uniqueness together with a complete classification of all such positive solutions, extending the p=2 results of [LM,QS].
Significance. If the derivations hold, the work would deliver a full classification of positive solutions for the D^{1,p}-critical quasilinear Schrödinger system, extending the Laplacian case to the p-Laplacian setting. This is a substantive contribution to the literature on critical elliptic systems, provided the scaling-critical relation is correctly identified and the Pohozaev identity closes.
major comments (2)
- [Abstract] Abstract (and presumably the setup in §1 or §2): the system is asserted to be D^{1,p}-critical, yet the explicit algebraic relation between α, β, p and N that enforces scale invariance under the D^{1,p} norm (typically of the form α + β = (N(p-1) + p)/(N-p) or the system-adjusted critical exponent) is never displayed. Without this relation the Pohozaev-type identity and the asymptotic matching used for classification cannot be verified to close, rendering the uniqueness claim unverifiable from the given information.
- [Abstract] The range 0 ≤ α ≤ β is stated without confirmation that it is compatible with the critical scaling; if the relation in the previous comment is not satisfied inside this range, the moving-plane argument and the claimed radial symmetry may fail to apply.
Simulated Author's Rebuttal
We thank the referee for the careful reading and for highlighting the need to explicitly display the criticality condition. We agree that this should be stated clearly and will revise the manuscript accordingly.
read point-by-point responses
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Referee: [Abstract] Abstract (and presumably the setup in §1 or §2): the system is asserted to be D^{1,p}-critical, yet the explicit algebraic relation between α, β, p and N that enforces scale invariance under the D^{1,p} norm (typically of the form α + β = (N(p-1) + p)/(N-p) or the system-adjusted critical exponent) is never displayed. Without this relation the Pohozaev-type identity and the asymptotic matching used for classification cannot be verified to close, rendering the uniqueness claim unverifiable from the given information.
Authors: We thank the referee for this observation. The D^{1,p}-critical condition for the system is α + β = \frac{N(p-1) + p}{N - p}. This relation ensures the right-hand sides are homogeneous of the correct degree with respect to the D^{1,p} scaling, so that the Pohozaev identity closes and the asymptotic decay rates are consistent with the classification. Although the proofs are carried out under this scaling, we acknowledge the relation was not written explicitly in the abstract or early sections. We will insert the formula prominently in the revised abstract and §1. revision: yes
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Referee: [Abstract] The range 0 ≤ α ≤ β is stated without confirmation that it is compatible with the critical scaling; if the relation in the previous comment is not satisfied inside this range, the moving-plane argument and the claimed radial symmetry may fail to apply.
Authors: Once the critical relation α + β = \frac{N(p-1) + p}{N - p} is fixed, the ordering 0 ≤ α ≤ β is without loss of generality by symmetry of the system in (u,v). This range lies inside the admissible set for the critical exponent and preserves the cooperative structure needed for the moving-plane method: the map (s,t) ↦ s^α t^β remains positive and increasing in each variable separately. The proofs in §§4–5 verify the required monotonicity conditions directly under this ordering. We will add a short remark after the statement of the critical relation confirming compatibility. revision: yes
Circularity Check
No circularity: classification derived from standard regularity, symmetry, and Pohozaev analysis rather than self-definition or fitted inputs
full rationale
The paper establishes regularity, asymptotic decay, radial symmetry, and uniqueness for positive solutions of the stated system by extending known p=2 techniques to the p-Laplacian case via functional-analytic methods. The criticality assertion is used to set up the problem but does not reduce the classification result to a tautology or to a parameter fitted from the target solutions themselves. No self-citation chain is load-bearing for the central uniqueness claim, and the derivation does not rename a known empirical pattern or smuggle an ansatz. The result is therefore self-contained against external benchmarks.
Axiom & Free-Parameter Ledger
axioms (2)
- standard math Standard properties of the p-Laplacian and the space D^{1,p}(R^N) (Sobolev embeddings, regularity theory)
- domain assumption The nonlinearity is D^{1,p}-critical
Reference graph
Works this paper leans on
-
[1]
C. A. Antonini, G. Ciraolo and F. Pagliarin,Second-order regularity for degeneratep-Laplace type equations with log-concave weights, J. London Math. Soc.,112(2025), e70299
2025
-
[2]
C. O. Alves,Existence of positive solutions for a problem with lack of compactness involving thep-Laplacian, Nonlinear Anal.,51(2002), no. 7, 1187-1206
2002
-
[3]
M. F. Bidaut-V´ eron,Local and global behavior of solutions of quasilinear equations of Emden-Fowler type, Arch. Ration. Mech. Anal.,107(1989), no. 4, 293-324
1989
-
[4]
Caffarelli, B
L. Caffarelli, B. Gidas and J. Spruck,Asymptotic symmetry and local behavior of semilinear elliptic equations with critical Sobolev growth, Comm. Pure Appl. Math.,42(1989), no. 3, 271-297
1989
-
[5]
D. Cao, W. Dai and Y. Li,Radial symmetry and sharp asymptotic behaviors of nonnegative solutions to weighted doublyD 1,p-critical quasi-linear nonlocal elliptic equations with Hardy potential, Science China: Mathematics,69(2026), no. 5, 1143-1196
2026
-
[6]
D. Cao, W. Dai and G. Qin,Super poly-harmonic properties, Liouville theorems and classification of non- negative solutions to equations involving higher-order fractional Laplacians, Trans. Amer. Math. Soc.,374 (2021), no. 7, 4781-4813
2021
-
[7]
D. Cao, Y. Guo and S. Peng,Uniqueness theorems for solutions of mixed order elliptic system with general nonlinearity onR 4, J. Math. Pures Appl.,209(2026), Article No. 103879
2026
-
[8]
D. Cao, S. Peng and S. Yan,Infinitely many solutions forp-Laplacian equation involving critical Sobolev growth, Journal of Functional Analysis, 2012, 262(6): 2861-2902
2012
-
[9]
Catino, D
G. Catino, D. D. Monticelli and A. Roncoroni,On the criticalp-Laplace equation, Adv. Math.,433(2023), Paper No. 109331, 38 pp
2023
-
[10]
L. Chen, W. Dai, C. Gui and Y. Luo,Liouville theorems forp-Laplacian equations in convex cones without finite-energy condition, arXiv:2605.29281, 39 pp. 38 NENG CHENG, WEI DAI, ZHAO LIU
-
[11]
Chen and C
W. Chen and C. Li,Classification of solutions of some nonlinear elliptic equations, Duke Math. J.,62 (1991), no. 3, 615-622
1991
-
[12]
Chen and C
W. Chen and C. Li,A priori estimates for prescribing scalar curvature equations, Ann. of Math.,145(1997), no. 3, 547-564
1997
-
[13]
W. Chen, C. Li and Y. Li,A direct method of moving planes for the fractional Laplacian, Adv. Math.,308 (2017), 404-437
2017
-
[14]
W. Chen, C. Li and B. Ou,Classification of solutions for an integral equation, Comm. Pure Appl. Math., 59(2006), no. 3, 330-343
2006
-
[15]
W. Chen, W. Dai and G. Qin,Liouville type theorems, a priori estimates and existence of solutions for critical and super-critical order Hardy-H´ enon type equations inR n, Math. Z.,303(2023), Paper No. 104, 36 pp
2023
-
[16]
Cingolani and G
S. Cingolani and G. Vannella,Multiple positive solutions for a critical quasilinear equation via Morse theory, Ann. Inst. H. Poincar´ e C Anal. Non Lin´ eaire,26(2009), no. 2, 397-413
2009
-
[17]
Ciraolo, A
G. Ciraolo, A. Figalli and A. Roncoroni,Symmetry results for critical anisotropicp-Laplacian equations in convex cones, Geom. Funct. Anal.,30(2020), no. 3, 770-803
2020
-
[18]
W. Dai, L. Duan, C. Gui and Y. Li,Non-radial solutions for the critical quasi-linear H´ enon equation involving p-Laplacian inR N, Proc. London Math. Soc.,132(2026), no. 4, e70148, 61 pp
2026
-
[19]
W. Dai, Y. Li and Z. Liu,Radial symmetry and sharp asymptotic behaviors of nonnegative solutions to D1,p-critical quasi-linear static Schr¨ odinger-Hartree equation involvingp-Laplacian−∆ p, Math. Ann.,391 (2024), no. 2, 2653–2708
2024
-
[20]
W. Dai, Z. Liu and G. Qin,Classification of nonnegative solutions to static Schr¨ odinger-Hartree-Maxwell type equations, SIAM J. Math. Anal.,53(2021), no. 2, 1379-1410
2021
-
[21]
W. Dai, Z. Liu and B. Sciunzi,Classification of solutions to−∆u=e −2u in the half-space, Rev. Mat. Iberoam.,42(2026), no. 3, 1039-1058
2026
-
[22]
Dai and G
W. Dai and G. Qin,Classification of nonnegative classical solutions to third-order equations, Adv. Math., 328(2018), 822-857
2018
-
[23]
Dai and G
W. Dai and G. Qin,Liouville type theorem for critical order H´ enon-Lane-Emden type equations on a half space and its applications, J. Funct. Anal.,281(2021), no. 10, Paper No. 109227, 37 pp
2021
-
[24]
Dai and G
W. Dai and G. Qin,Liouville type theorems for fractional and higher order H´ enon-Hardy type equations via the method of scaling spheres, Int. Math. Res. Not. IMRN,2023(2023), no. 11, 9001-9070
2023
-
[25]
Dai and G
W. Dai and G. Qin,Classification of solutions to conformally invariant systems with mixed order and exponentially increasing or nonlocal nonlinearity, SIAM J. Math. Anal.,55(2023), no. 3, 2111-2149
2023
-
[26]
Damascelli,Comparison theorems for some quasilinear degenerate elliptic operators and applications to symmetry and monotonicity results, Ann
L. Damascelli,Comparison theorems for some quasilinear degenerate elliptic operators and applications to symmetry and monotonicity results, Ann. Inst. Henri Poincar´ e, Anal. Non Lin´ eaire,15(1998), no. 4, 493-516
1998
-
[27]
Damascelli, A
L. Damascelli, A. Farina, B. Sciunzi and E. Valdinoci,Liouville results form-Laplace equations of Lane- Emden-Fowler type, Ann. Inst. H. Poincar´ e Anal. Non Lin´ eaire,26(2009), no. 4, 1099-1119
2009
-
[28]
Damascelli and F
L. Damascelli and F. Pacella,Monotonicity and symmetry of solutions ofp-Laplace equations via the moving plane method, Ann. Sc. Norm. Super. Pisa Cl. Sci. 26 (4) (1998) 689-707
1998
-
[29]
Damascelli, S
L. Damascelli, S. Merch´ an, L. Montoro and B. Sciunzi,Radial symmetry and applications for a problem involving the−∆ p(·)operator and critical nonlinearity inR N, Advances in Mathematics,265(2014), 313- 335
2014
-
[30]
Damascelli, F
L. Damascelli, F. Pacella and M. Ramaswamy,Symmetry of ground states ofp-Laplace equations via the moving plane method, Arch. Ration. Mech. Anal.,148(1999), no. 4, 291-308
1999
-
[31]
Damascelli and M
L. Damascelli and M. Ramaswamy,Symmetry ofC 1 solutions ofp-Laplace equations inR N, Adv. Nonlinear Stud.,1(2001), no. 1, 40-64
2001
-
[32]
Damascelli and B
L. Damascelli and B. Sciunzi,Regularity, monotonicity and symmetry of positive solutions ofm-Laplace equations, J. Differential Equations,206(2004), no. 2, 483-515
2004
-
[33]
Damascelli and B
L. Damascelli and B. Sciunzi,Harnack inequalities, maximum and comparison principles, and regularity of positive solutions ofm-Laplace equations, Calc. Var. Partial Differ. Equ.,25(2006), no. 2, 139-159
2006
-
[34]
E. N. Dancer, D. Daners and D. Hauer,A Liouville theorem forp-harmonic functions on exterior domains, Positivity,19(2015), 577-586
2015
-
[35]
E. N. Dancer, H. Yang and W. Zou,Liouville-type results for a class of quasilinear elliptic systems and applications. (English summary), J. Lond. Math. Soc.,99(2019), no. 2, 273-294
2019
-
[36]
DiBenedetto,C 1+α local regularity of weak solutions of degenerate elliptic equations, Nonlinear Anal.,7 (1983), no
E. DiBenedetto,C 1+α local regularity of weak solutions of degenerate elliptic equations, Nonlinear Anal.,7 (1983), no. 8, 827-850. CLASSIFICATION RESULTS FOR CRITICAL SCHR ¨ODINGER SYSTEM 39
1983
-
[37]
Dipierro,Geometric inequalities and symmetry results for elliptic systems, Discrete Contin
S. Dipierro,Geometric inequalities and symmetry results for elliptic systems, Discrete Contin. Dyn. Syst.-A, 33(2013), no. 8, 3473-3496
2013
-
[38]
Esposito, R
F. Esposito, R. L. Soriano and B. Sciunzi,Classification of solutions to Hardy-Sobolev doubly critical systems, J. Math. Pures Appl.,189(2024) 103595
2024
-
[39]
Farina, B
A. Farina, B. Sciunzi and E. Valdinoci,On a Poincar´ e type formula for solutions of singular and degenerate elliptic equations, Manuscripta Math.,132(2010), no. 3-4, 335-342
2010
-
[40]
Ferrari and E
F. Ferrari and E. Valdinoci,Some weighted Poincar´ e inequalities, Indiana Univ. Math. J.,58(2009), no. 4, 1619-1637
2009
-
[41]
Gidas, W
B. Gidas, W. M. Ni and L. Nirenberg,Symmetry and related properties via the maximum principle, Comm. Math. Phys.,68(1979), no. 3, 209-243
1979
-
[42]
Gilbarg and N
D. Gilbarg and N. S. Trudinger,Elliptic Partial Differential Equations of Second Order, 2nd Edition, Springer, Berlin, 1983
1983
-
[43]
Guedda and L
M. Guedda and L. Veron,Local and global properties of solutions of quasilinear elliptic equations, J. Differ- ential Equations,76(1988), no. 1, 159-189
1988
-
[44]
Guo and J
Y. Guo and J. Liu,Solutions ofp-sublinearp-Laplacian equation via Morse theory. (English summary), J. London Math. Soc.,72(2005), no. 3, 632-644
2005
-
[45]
Han and F
Q. Han and F. Lin,Elliptic partial differential equations. Second edition. Courant Lecture Notes in Mathe- matics, Courant Institute of Mathematical Sciences, New York; American Mathematical Society, Providence, RI, 2011. x+147 pp. ISBN: 978-0-8218-5313-9
2011
-
[46]
Kuusi and G
T. Kuusi and G. Mingione,Universal potential estimates, J. Funct. Anal.,262(2012), 4205-4269
2012
-
[47]
Le and D
P. Le and D. H. T. Le,Classification of positive solutions top-Laplace equations with critical Hardy-Sobolev exponent, Nonlinear Analysis: Real World Applications,74(2023), Paper No. 103949
2023
-
[48]
Li and L
C. Li and L. Ma,Uniqueness of positive bound states to Schr¨ odinger systems with critical exponents, SIAM J. Math. Anal.,40(2008), no. 3, 1049-1057
2008
-
[49]
G. M. Lieberman,Boundary regularity for solutions of degenerate elliptic equations, Nonlinear Anal.,12 (1988), no. 11, 1203-1219
1988
-
[50]
K. Li, M. Li and J. Wei,On a new region for the Lane-Emden conjecture in higher dimensions, arXiv:2510.06613, 27 pp
-
[51]
K. Li, M. Yu and Z. Zhang,Liouville-type theorems for fractional Hardy-H´ enon systems,31(2024), article number 15, 24 pp
2024
-
[52]
C. S. Lin,A classification of solutions of a conformally invariant fourth order equation inR n, Comment. Math. Helv.,73(1998), 206-231
1998
-
[53]
Moser,A new proof of De Giorgi’s theorem concerning the regularity problem for elliptic differential equations, Comm
J. Moser,A new proof of De Giorgi’s theorem concerning the regularity problem for elliptic differential equations, Comm. Pure Appl. Math.,13(1960), 457-468
1960
-
[54]
Ou,On the classification of entire solutions to the criticalp-Laplace equation, Math
Q. Ou,On the classification of entire solutions to the criticalp-Laplace equation, Math. Ann.,392(2025), no. 2, 1711-1729
2025
-
[55]
Oliva, B
F. Oliva, B. Sciunzi and G. Vaira,Radial symmetry for a quasilinear elliptic equation with a critical Sobolev growth and Hardy potential, J. Math. Pures Appl.,140(2020), 89-109
2020
-
[56]
Pol´ aˇ cik, P
P. Pol´ aˇ cik, P. Quittner and P. Souplet,Singularity and decay estimates in superlinear problems via Liouville- type theorems. I. Elliptic equations and systems, Duke Math. J.,139(2007), no. 3, 555-579
2007
-
[57]
Pucci and J
P. Pucci and J. Serrin,The Maximum Principle, Birkh¨ auser, Boston, 2007
2007
-
[58]
Quittner and P
P. Quittner and P. Souplet,Symmetry of components for semilinear elliptic systems, SIAM J. Math. Anal., 44(2012), no. 4, 2545-2559
2012
-
[59]
Sciunzi,Classification of positiveD 1,p(RN)-solutions to the criticalp-Laplace equation inR N, Advances in Mathematics,291(2016), 12-23
B. Sciunzi,Classification of positiveD 1,p(RN)-solutions to the criticalp-Laplace equation inR N, Advances in Mathematics,291(2016), 12-23
2016
-
[60]
Sciunzi,Regularity and comparison principles forp-Laplace equations with vanishing source term, Com- munications in Contemporary Mathematics,16(2014), no
B. Sciunzi,Regularity and comparison principles forp-Laplace equations with vanishing source term, Com- munications in Contemporary Mathematics,16(2014), no. 6, Paper No. 1450013
2014
-
[61]
Serrin,Local behavior of solutions of quasi-linear equations, Acta Math.,111(1964), 247-302
J. Serrin,Local behavior of solutions of quasi-linear equations, Acta Math.,111(1964), 247-302
1964
-
[62]
Serrin,A symmetry problem in potential theory, Arch
J. Serrin,A symmetry problem in potential theory, Arch. Ration. Mech. Anal.,43(1971), no. 4, 304-318
1971
-
[63]
Serrin and H
J. Serrin and H. Zou,Non-existence of positive solutions of Lane-Emden systems, Differential & Integral Equations,9(1996), no. 4, 635-653
1996
-
[64]
Serrin and H
J. Serrin and H. Zou,Cauchy-Liouville and universal boundedness theorems for quasilinear elliptic equations and inequalities, Acta Math.,189(2002), no. 1, 79-142
2002
-
[65]
Souplet,The proof of the Lane-Emden conjecture in four space dimensions, Adv
P. Souplet,The proof of the Lane-Emden conjecture in four space dimensions, Adv. Math.,221(2009), no. 5, 1409-1427
2009
-
[66]
Talenti,Best constant in Sobolev inequality, Ann
G. Talenti,Best constant in Sobolev inequality, Ann. Mat. Pura Appl.,110(1976), no. 4, 353-372. 40 NENG CHENG, WEI DAI, ZHAO LIU
1976
-
[67]
Teixeira,Regularity for quasilinear equations on degenerate singular sets, Math
E. Teixeira,Regularity for quasilinear equations on degenerate singular sets, Math. Ann.,358(2014), no. 1-2, 241-256
2014
-
[68]
Tolksdorf,Regularity for a more general class of quasilinear elliptic equations, J
P. Tolksdorf,Regularity for a more general class of quasilinear elliptic equations, J. Differential Equations, 51(1984), no. 1, 126-150
1984
-
[69]
N. S. Trudinger,Remarks concerning the conformal deformation of Riemannian structures on compact man- ifolds, Ann. Sc. Norm. Super. Pisa,22(1968), no. 3, 265-274
1968
-
[70]
J. L. V´ azquez,A strong maximum principle for some quasilinear elliptic equations, Appl. Math. Optim.,12 (1984), no. 3, 191-202
1984
-
[71]
V´ etois,A priori estimates and application to the symmetry of solutions for criticalp–Laplace equations, J
J. V´ etois,A priori estimates and application to the symmetry of solutions for criticalp–Laplace equations, J. Differential Equations,260(2016), no. 1, 149-161
2016
-
[72]
Wei and X
J. Wei and X. Xu,Classification of solutions of higher order conformally invariant equations, Math. Ann., 313(1999), no. 2, 207-228
1999
-
[73]
C. L. Xiang,Asymptotic behaviors of solutions to quasilinear elliptic equations with critical Sobolev growth and Hardy potential, J. Differential Equations,259(2015), no. 8, 3929-3954
2015
-
[74]
Zhang and S
Z. Zhang and S. Li,On sign-changing and multiple solutions of thep-Laplacian, J. Funct. Anal. 197 (2003), no. 2, 447-468
2003
-
[75]
Y. Zhou,Classification theorem for positive critical points of Sobolev trace inequality, arXiv: 2402.17602v3. School of Mathematical Sciences, Jiangxi Science and Technology Normal University, Nan- chang 330038, P. R. China Email address:Chengn1108@126.com School of Mathematical Sciences, Beihang University (BUAA), Beijing 100191, P. R. China, and Key Lab...
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