Periodic Solutions of Lagrangian Systems on a Compact Manifold
Title | Periodic Solutions of Lagrangian Systems on a Compact Manifold PDF eBook |
Author | Vieri Benci |
Publisher | |
Pages | 31 |
Release | 1983 |
Genre | |
ISBN |
The question of existence and the number of periodic solutions of model equations for a classical mechanical system is a problem as old as the field of analytical mechanics itself. The development of the nonlinear functional analysis has renewed interest in these problems. In this paper we consider a mechanical system which is constrained to a compact manifold M. We suppose that the dynamics of the system is described by a T-periodic Lagrangian L sub t: TM approaches R which satisfies reasonable physical assumptions. The main result of this paper is: If the fundamental group of the manifold M is finite, then the Lagrangian nonlinear system of differential equations which describes the dynamical system has infinitely many distinct periodic solutions. (Author).
PERIODIC SOLUTION OF LAGRANGIAN SYSTEMS ON A COMPACT MANIFOLD.
Title | PERIODIC SOLUTION OF LAGRANGIAN SYSTEMS ON A COMPACT MANIFOLD. PDF eBook |
Author | Vieri Benci |
Publisher | |
Pages | |
Release | 1983 |
Genre | |
ISBN |
Periodic Solutions of Singular Lagrangian Systems
Title | Periodic Solutions of Singular Lagrangian Systems PDF eBook |
Author | A. Ambrosetti |
Publisher | Springer Science & Business Media |
Pages | 168 |
Release | 2012-12-06 |
Genre | Mathematics |
ISBN | 1461203198 |
Thismonographdealswiththeexistenceofperiodicmotionsof Lagrangiansystemswith ndegreesoffreedom ij + V'(q) =0, where Visasingularpotential. Aprototypeofsuchaproblem, evenifitisnottheonlyphysicallyinterestingone, istheKepler problem . q 0 q+yqr= . This, jointlywiththemoregeneralN-bodyproblem, hasalways beentheobjectofagreatdealofresearch. Mostofthoseresults arebasedonperturbationmethods, andmakeuseofthespecific featuresoftheKeplerpotential. OurapproachismoreonthelinesofNonlinearFunctional Analysis:ourmainpurposeistogiveafunctionalframefor systemswithsingularpotentials, includingtheKeplerandthe N-bodyproblemasparticularcases. PreciselyweuseCritical PointTheorytoobtainexistenceresults, qualitativeinnature, whichholdtrueforbroadclassesofpotentials. Thishighlights thatthevariationalmethods, whichhavebeenemployedtoob tainimportantadvancesinthestudyofregularHamiltonian systems, canbesuccessfallyusedtohandlesingularpotentials aswell. Theresearchonthistopicisstillinevolution, andtherefore theresultswewillpresentarenottobeintendedasthefinal ones. Indeedamajorpurposeofourdiscussionistopresent methodsandtoolswhichhavebeenusedinstudyingsuchprob lems. Vlll PREFACE Partofthematerialofthisvolumehasbeenpresentedina seriesoflecturesgivenbytheauthorsatSISSA, Trieste, whom wewouldliketothankfortheirhospitalityandsupport. We wishalsotothankUgoBessi, PaoloCaldiroli, FabioGiannoni, LouisJeanjean, LorenzoPisani, EnricoSerra, KazunakaTanaka, EnzoVitillaroforhelpfulsuggestions. May26,1993 Notation n 1. For x, yE IR, x. ydenotestheEuclideanScalarproduct, and IxltheEuclideannorm. 2. meas(A)denotestheLebesguemeasureofthesubset Aof n IR - 3. Wedenoteby ST =[0,T]/{a, T}theunitarycirclepara metrizedby t E[0,T]. Wewillalsowrite SI= ST=I. n 1 n 4. Wewillwrite sn = {xE IR + : Ixl =I}andn = IR \{O}. n 5. Wedenoteby LP([O, T], IR),1~ p~+00,theLebesgue spaces, equippedwiththestandardnorm lIulip. l n l n 6. H (ST, IR)denotestheSobolevspaceof u E H,2(0, T; IR) suchthat u(O) = u(T). Thenormin HIwillbedenoted by lIull2 = lIull~ + lIull~· 7. Wedenoteby(·1·)and11·11respectivelythescalarproduct andthenormoftheHilbertspace E. 8. For uE E, EHilbertorBanachspace, wedenotetheball ofcenter uandradiusrby B(u, r) = {vE E: lIu- vii~ r}. Wewillalsowrite B = B(O, r). r 1 1 9. WesetA (n) = {uE H (St, n)}. k 10. For VE C (1Rxil, IR)wedenoteby V'(t, x)thegradient of Vwithrespectto x. l 11. Given f E C (M, IR), MHilbertmanifold, welet r = {uEM: f(u) ~ a}, f-l(a, b) = {uE E : a~ f(u) ~ b}. x NOTATION 12. Given f E C1(M, JR), MHilbertmanifold, wewilldenote by Zthesetofcriticalpointsof fon Mandby Zctheset Z U f-l(c, c). 13. Givenasequence UnE E, EHilbertspace, by Un --"" Uwe willmeanthatthesequence Unconvergesweaklyto u. 14. With £(E)wewilldenotethesetoflinearandcontinuous operatorson E. 15. With Ck''''(A, JR)wewilldenotethesetoffunctions ffrom AtoJR, ktimesdifferentiablewhosek-derivativeisHolder continuousofexponent0:. Main Assumptions Wecollecthere, forthereader'sconvenience, themainassump tionsonthepotential Vusedthroughoutthebook. (VO) VEC1(lRXO, lR), V(t+T, x)=V(t, X) V(t, x)ElRXO, (VI) V(t, x)
Periodic Solutions of Lagrangian Systems on Manifolds with Boundary
Title | Periodic Solutions of Lagrangian Systems on Manifolds with Boundary PDF eBook |
Author | Annamaria Canino |
Publisher | |
Pages | 26 |
Release | 1989 |
Genre | |
ISBN |
Periodic Solutions of Singular Lagrangian Systems
Title | Periodic Solutions of Singular Lagrangian Systems PDF eBook |
Author | Antonio Ambrosetti |
Publisher | |
Pages | 157 |
Release | 1993-01-01 |
Genre | Critical point theory |
ISBN | 9783764336554 |
Critical Point Theory for Lagrangian Systems
Title | Critical Point Theory for Lagrangian Systems PDF eBook |
Author | Marco Mazzucchelli |
Publisher | Springer Science & Business Media |
Pages | 196 |
Release | 2011-11-16 |
Genre | Science |
ISBN | 3034801637 |
Lagrangian systems constitute a very important and old class in dynamics. Their origin dates back to the end of the eighteenth century, with Joseph-Louis Lagrange’s reformulation of classical mechanics. The main feature of Lagrangian dynamics is its variational flavor: orbits are extremal points of an action functional. The development of critical point theory in the twentieth century provided a powerful machinery to investigate existence and multiplicity questions for orbits of Lagrangian systems. This monograph gives a modern account of the application of critical point theory, and more specifically Morse theory, to Lagrangian dynamics, with particular emphasis toward existence and multiplicity of periodic orbits of non-autonomous and time-periodic systems.
Geometric Mechanics: Dynamics and symmetry
Title | Geometric Mechanics: Dynamics and symmetry PDF eBook |
Author | Darryl D. Holm |
Publisher | Imperial College Press |
Pages | 375 |
Release | 2008-01-01 |
Genre | Mathematics |
ISBN | 1848161956 |
Advanced undergraduate and graduate students in mathematics, physics and engineering.