Abstract
We obtain rigidity and triviality results for q-solitons, assuming that the structure tensor q satisfies a condition analogous to the twice contracted second Bianchi identity (in particular, divergence free and trace free) and that the soliton vector field is projective and an infinitesimal harmonic transformation. In particular, the efficacy of our general results is manifested by applying it to Bach solitons. Finally, we generalize the evolution equation for the scalar curvature of Ricci solitons to q-solitons in order to recover the Bourguignon–Ezin formula and a rigidity result on compact Ricci solitons.
Funding statement: The first author was funded by the University Grants Commission (UGC), India, in the form of a Senior Research Fellowship.
Acknowledgements
The authors are immensely thankful to the referee for numerous valuable suggestions toward considerable improvement of this paper.
Communicated by: P. Eberlein
References
[1] R. Arnowitt, S. Deser, C. W. Misner, The dynamics of general relativity. In: Gravitation: An introduction to current research, 227–265, Wiley, New York-London 1962. MR143629 Zbl 0115.43103Search in Google Scholar
[2] R. Bach, Zur Weylschen Relativitätstheorie und der Weylschen Erweiterung des Krümmungstensorbegriffs. Math. Z. 9 (1921), 110–135. MR1544454 JFM 48.1035.0110.1007/BF01378338Search in Google Scholar
[3] E. Bahuaud, C. Guenther, J. Isenberg, R. Mazzeo, Well-posedness of nonlinear flows on manifolds of bounded geometry. Ann. Global Anal. Geom. 65 (2024), Paper No. 25, 39 pages. MR4742191 Zbl 0786236810.1007/s10455-023-09940-xSearch in Google Scholar
[4] E. Bahuaud, D. Helliwell, Short-time existence for some higher-order geometric flows. Comm. Partial Differential Equations 36 (2011), 2189–2207. MR2852074 Zbl 1242.5307910.1080/03605302.2011.593015Search in Google Scholar
[5] E. Bahuaud, D. Helliwell, Uniqueness for some higher-order geometric flows. Bull. Lond. Math. Soc. 47 (2015), 980–995. MR3431578 Zbl 1338.5309210.1112/blms/bdv076Search in Google Scholar
[6] J.-P. Bourguignon, J.-P. Ezin, Scalar curvature functions in a conformal class of metrics and conformal transformations. Trans. Amer. Math. Soc. 301 (1987), 723–736. MR882712 Zbl 0622.5302310.1090/S0002-9947-1987-0882712-7Search in Google Scholar
[7] H.-D. Cao, Recent progress on Ricci solitons. In: Recent advances in geometric analysis, volume 11 of Adv. Lect. Math., 1–38, International Press, Somerville, MA 2010. MR2648937 Zbl 1201.53046Search in Google Scholar
[8] H.-D. Cao, Q. Chen, On Bach-flat gradient shrinking Ricci solitons. Duke Math. J. 162 (2013), 1149–1169. MR3053567 Zbl 1277.53036)10.1215/00127094-2147649Search in Google Scholar
[9] B. Chow, S.-C. Chu, D. Glickenstein, C. Guenther, J. Isenberg, T. Ivey, D. Knopf, P. Lu, F. Luo, L. Ni, The Ricci flow: techniques and applications. Part I, volume 135 of Mathematical Surveys and Monographs. Amer. Math. Soc. 2007. MR2302600 Zbl 1157.5303410.1090/surv/144Search in Google Scholar
[10] A. W. Cunha, E. Griffin, On non-compact gradient solitons. Ann. Global Anal. Geom. 63 (2023), Paper No. 27, 20 pages. MR4595986 Zbl 1517.5308610.1007/s10455-023-09904-1Search in Google Scholar
[11] S. Das, S. Kar, Bach flows of product manifolds. Int. J. Geom. Methods Mod. Phys. 9 (2012), 1250039, 18 pages. MR2948858 Zbl 1258.5307010.1142/S0219887812500399Search in Google Scholar
[12] C. Fefferman, C. R. Graham, The ambient metric, volume 178 of Annals of Mathematics Studies. Princeton Univ. Press 2012. MR2858236 Zbl 1243.5300410.23943/princeton/9780691153131.001.0001Search in Google Scholar
[13] A. Ghosh, On Bach almost solitons. Beitr. Algebra Geom. 63 (2022), 45–54. MR4393949 Zbl 1489.5306910.1007/s13366-021-00565-4Search in Google Scholar
[14] E. Griffin, Gradient ambient obstruction solitons on homogeneous manifolds. Ann. Global Anal. Geom. 60 (2021), 469–499. MR4304859 Zbl 1486.5304810.1007/s10455-021-09784-3Search in Google Scholar
[15] E. Griffin, R. Poddar, R. Sharma, W. Wylie, Extended solitons of the ambient obstruction flow. Preprint 2024, arXiv:2405.1587010.1007/s12220-025-02002-7Search in Google Scholar
[16] H. Hiramatu, Riemannian manifolds admitting a projective vector field. Kodai Math. J. 3 (1980), 397–406. MR604484 Zbl 0454.5302910.2996/kmj/1138036262Search in Google Scholar
[17] P. T. Ho, Bach flow. J. Geom. Phys. 133 (2018), 1–9. MR3850251 Zbl 1398.5307410.1016/j.geomphys.2018.07.008Search in Google Scholar
[18] S. Kim, Rigidity of noncompact complete Bach-flat manifolds. J. Geom. Phys. 60 (2010), 637–642. MR2602377 Zbl 1188.5303410.1016/j.geomphys.2009.12.014Search in Google Scholar
[19] O. Nouhaud, Transformations infinitésimales harmoniques. C. R. Acad. Sci. Paris Sér. A-B 274 (1972), A573–A576. MR290289 Zbl 0242.53013Search in Google Scholar
[20] P. Petersen, W. Wylie, Rigidity of gradient Ricci solitons. Pacific J. Math. 241 (2009), 329–345. MR2507581 Zbl 1176.5304810.2140/pjm.2009.241.329Search in Google Scholar
[21] P. Petersen, W. Wylie, Rigidity of homogeneous gradient soliton metrics and related equations. Differential Geom. Appl. 84 (2022), Paper No. 101929, 29 pages. MR4457372 Zbl 1506.5306410.1016/j.difgeo.2022.101929Search in Google Scholar
[22] R. Sharma, Characterizations of weakly conformally flat and quasi Einstein manifolds. J. Geom. 114 (2023), Paper No. 17, 9 pages. MR4615516 Zbl 1520.5303210.1007/s00022-023-00680-8Search in Google Scholar
[23] R. Sharma, S. Deshmukh, Ricci almost solitons with associated projective vector field. Adv. Geom. 22 (2022), 1–8. MR4371940 Zbl 1486.5306510.1515/advgeom-2021-0034Search in Google Scholar
[24] S. E. Stepanov, I. G. Shandra, Geometry of infinitesimal harmonic transformations. Ann. Global Anal. Geom. 24 (2003), 291–299. MR1996772 Zbl 1035.5309010.1023/A:1024753028255Search in Google Scholar
[25] S. E. Stepanov, V. N. Shelepova, A remark on Ricci solitons. Math. Notes 86 (2009), 447–450. MR2591387 Zbl 1182.5306210.1134/S0001434609090193Search in Google Scholar
[26] S. Tanno, Promenades on spheres. A sketch book of eight scenes on spheres. Lecture notes, Dept. Math., Tokyo Inst. Tech., 1996.Search in Google Scholar
[27] Y. Tashiro, Complete Riemannian manifolds and some vector fields. Trans. Amer. Math. Soc. 117 (1965), 251–275. MR174022 Zbl 0136.1770110.1090/S0002-9947-1965-0174022-6Search in Google Scholar
[28] A. Thompson, Bach flow of simply connected nilmanifolds. Adv. Geom. 24 (2024), 127–139. MR4694258 Zbl 1539.5311510.1515/advgeom-2023-0032Search in Google Scholar
[29] D. J. Welsh, Jr., Manifolds that admit parallel vector fields. Illinois J. Math. 30 (1986), 9–18. MR822382 Zbl 0581.5302710.1215/ijm/1256044750Search in Google Scholar
[30] K. Yano, Integral formulas in Riemannian geometry. Dekker 1970. MR284950 Zbl 0213.23801Search in Google Scholar
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Articles in the same Issue
- Frontmatter
- Polyhedral combinatorics of bisectors
- Explicit construction of decomposable Jacobians
- Some rigidity results on q-solitons
- Quasimorphisms on nonorientable surface diffeomorphism groups
- On nearly optimal paper Moebius bands
- Desargues’ Theorem in Laguerre Planes
- Simple obstructions and cone reduction
- The Bogomolov–Gieseker–Koseki inequality on surfaces with canonical singularities in arbitrary characteristic
- The simultaneous lattice packing-covering constant of octahedra
- An Abel–Jacobi theorem for metrized complexes of Riemann surfaces
- Exploring the interplay of semistable vector bundles and their restrictions on reducible curves
- Another proof of Segre’s theorem about ovals
Articles in the same Issue
- Frontmatter
- Polyhedral combinatorics of bisectors
- Explicit construction of decomposable Jacobians
- Some rigidity results on q-solitons
- Quasimorphisms on nonorientable surface diffeomorphism groups
- On nearly optimal paper Moebius bands
- Desargues’ Theorem in Laguerre Planes
- Simple obstructions and cone reduction
- The Bogomolov–Gieseker–Koseki inequality on surfaces with canonical singularities in arbitrary characteristic
- The simultaneous lattice packing-covering constant of octahedra
- An Abel–Jacobi theorem for metrized complexes of Riemann surfaces
- Exploring the interplay of semistable vector bundles and their restrictions on reducible curves
- Another proof of Segre’s theorem about ovals