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On Schrodinger Equations With Non-Perturbative Potentials
On Schrodinger Equations With Non-Perturbative Potentials
On Schrodinger Equations With Non-Perturbative Potentials

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자료유형  
 학위논문 서양
최종처리일시  
20250211151034
ISBN  
9798383350836
DDC  
510
저자명  
Black, Adam.
서명/저자  
On Schrodinger Equations With Non-Perturbative Potentials
발행사항  
[Sl] : Yale University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
297 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-01, Section: B.
주기사항  
Advisor: Schlag, Wilhelm.
학위논문주기  
Thesis (Ph.D.)--Yale University, 2024.
초록/해제  
요약This thesis consists of four parts, each studying a different class of Schrodinger equations. Though the setting and relevant questions vary between chapters, a theme that runs through all of them is the study of a Hamiltonian with a potential that is not small enough to be treated perturbatively. Indeed, in all of the Schrodinger equations below, the potential is, in some sense, large enough that it may affect the asymptotic behavior of the system.In Chapters 2 and 3, we investigate the scattering theory of Schrodinger operators with potentials that have anisotropic decay. More specifically, we assume that the potential in question decays in a short-range way, but only along a collection of rays in Rd. This generalizes the classical setting of short-range scattering in which the potential decays along all rays to infinity. For these operators, we give a dynamical characterization of the scattering states and a corresponding description of their complement. Heuristically, we show that any state decomposes into an asymptotically free piece and a piece that may interact with the potential for long times. Chapter 3 considers the general setting of anisotropic short-range potentials, whereas Chapter 2 focuses on potentials that are short-range outside of a subspace of Rd. In this latter case and others, we show a more refined description of the scattering states and their complement, which we call the surface subspace.The results of Chapters 2 and 3 are agnostic to the structure of the potential, so in Chapter 4 we specialize to potentials that are periodic in some coordinate directions and compactly supported in the others. For such potentials, we show that a dense set of states in the surface subspace exhibit directional ballistic transport. This means that they evolve ballistically in the directions in which the potential is periodic while being confined in the directions in which it decays.In Chapter 5, we study a Hamiltonian with a repulsive Coulomb potential on R3. We show that radial solutions of the corresponding Schrodinger equation obey an L1 → L∞ estimate with the natural 3/2 decay rate. To accomplish this, we compute the kernel of the evolution via a distorted Fourier transform and then perform a detailed analysis of its asymptotics.This thesis contains joint work with Tal Malinovitch, David Damanik, Giorgio Young, Ebru Toprak, Jiahua Zou, and Bruno Vergara.
일반주제명  
Mathematics
일반주제명  
Theoretical mathematics
일반주제명  
Applied mathematics
키워드  
Schrodinger equations
키워드  
Non-perturbative potentials
키워드  
Hamiltonian
키워드  
Ballistic transport
기타저자  
Yale University Mathematics
기본자료저록  
Dissertations Abstracts International. 86-01B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aBlack,  Adam.
■24510▼aOn  Schrodinger  Equations  With  Non-Perturbative  Potentials
■260    ▼a[Sl]▼bYale  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a297  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-01,  Section:  B.
■500    ▼aAdvisor:  Schlag,  Wilhelm.
■5021  ▼aThesis  (Ph.D.)--Yale  University,  2024.
■520    ▼aThis  thesis  consists  of  four  parts,  each  studying  a  different  class  of  Schrodinger  equations.  Though  the  setting  and  relevant  questions  vary  between  chapters,  a  theme  that  runs  through  all  of  them  is  the  study  of  a  Hamiltonian  with  a  potential  that  is  not  small  enough  to  be  treated  perturbatively.  Indeed,  in  all  of  the  Schrodinger  equations  below,  the  potential  is,  in  some  sense,  large  enough  that  it  may  affect  the  asymptotic  behavior  of  the  system.In  Chapters  2  and  3,  we  investigate  the  scattering  theory  of  Schrodinger  operators  with  potentials  that  have  anisotropic  decay.  More  specifically,  we  assume  that  the  potential  in  question  decays  in  a  short-range  way,  but  only  along  a  collection  of  rays  in  Rd.  This  generalizes  the  classical  setting  of  short-range  scattering  in  which  the  potential  decays  along  all  rays  to  infinity.  For  these  operators,  we  give  a  dynamical  characterization  of  the  scattering  states  and  a  corresponding  description  of  their  complement.  Heuristically,  we  show  that  any  state  decomposes  into  an  asymptotically  free  piece  and  a  piece  that  may  interact  with  the  potential  for  long  times.  Chapter  3  considers  the  general  setting  of  anisotropic  short-range  potentials,  whereas  Chapter  2  focuses  on  potentials  that  are  short-range  outside  of  a  subspace  of  Rd.  In  this  latter  case  and  others,  we  show  a  more  refined  description  of  the  scattering  states  and  their  complement,  which  we  call  the  surface  subspace.The  results  of  Chapters  2  and  3  are  agnostic  to  the  structure  of  the  potential,  so  in  Chapter  4  we  specialize  to  potentials  that  are  periodic  in  some  coordinate  directions  and  compactly  supported  in  the  others.  For  such  potentials,  we  show  that  a  dense  set  of  states  in  the  surface  subspace  exhibit  directional  ballistic  transport.  This  means  that  they  evolve  ballistically  in  the  directions  in  which  the  potential  is  periodic  while  being  confined  in  the  directions  in  which  it  decays.In  Chapter  5,  we  study  a  Hamiltonian  with  a  repulsive  Coulomb  potential  on  R3.  We  show  that  radial  solutions  of  the  corresponding  Schrodinger  equation  obey  an  L1  →  L∞  estimate  with  the  natural  3/2  decay  rate.  To  accomplish  this,  we  compute  the  kernel  of  the  evolution  via  a  distorted  Fourier  transform  and  then  perform  a  detailed  analysis  of  its  asymptotics.This  thesis  contains  joint  work  with  Tal  Malinovitch,  David  Damanik,  Giorgio  Young,  Ebru  Toprak,  Jiahua  Zou,  and  Bruno  Vergara.
■590    ▼aSchool  code:  0265.
■650  4▼aMathematics
■650  4▼aTheoretical  mathematics
■650  4▼aApplied  mathematics
■653    ▼aSchrodinger  equations
■653    ▼aNon-perturbative  potentials
■653    ▼aHamiltonian
■653    ▼aBallistic  transport
■690    ▼a0405
■690    ▼a0642
■690    ▼a0364
■71020▼aYale  University▼bMathematics.
■7730  ▼tDissertations  Abstracts  International▼g86-01B.
■790    ▼a0265
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17160522▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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