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Some Aspects of Massive Higher Spin Particles
Some Aspects of Massive Higher Spin Particles
Some Aspects of Massive Higher Spin Particles

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자료유형  
 학위논문 서양
최종처리일시  
20250211152006
ISBN  
9798382826448
DDC  
530.1
저자명  
Lindwasser, Lukas William.
서명/저자  
Some Aspects of Massive Higher Spin Particles
발행사항  
[Sl] : University of California, Los Angeles, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
145 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
주기사항  
Advisor: Tomboulis, E. T.
학위논문주기  
Thesis (Ph.D.)--University of California, Los Angeles, 2024.
초록/해제  
요약This dissertation is a synthesis of work completed during my Ph.D., loosely connected by the appearance of higher spin particles.In Chapter 2, we explicitly construct an affine generalization of the Dirac action employing infinite dimensional spinorial representations of the group. This implies that it is built from an infinite number of spinor Lorentz multiplets with all possible half integer spins. We introduce a systematic procedure for constructing GL(d, ℝ) and SL(d, ℝ) invariant interaction terms to obtain quite general interacting models. Such models have order operators whose expectation value can break affine symmetry to Poincare symmetry. This symmetry breaking pattern is known to exhibit a graviton as its Goldstone boson. We discuss possible interactions and mechanisms for this symmetry breaking to occur, which would provide a dynamical explanation of the Lorentzian signature of spacetime.In Chapter 3, we study consistent deformations of Veneziano and Virasoro amplitudes. Under some physical assumptions, we find that their spectra must satisfy an over-determined set of non-linear recursion relations. The recursion relation for the generalized Veneziano amplitudes can be solved analytically and yields a two-parameter family which includes the Veneziano amplitude, the one-parameter family of Coon amplitudes, and a larger two-parameter family of amplitudes with an infinite tower of spins at each mass level. In the generalized Virasoro case, the only consistent solution is the string spectrum.In Chapter 4, we construct a new formalism for free massive particles of any spin, including integers and half integers, in any spacetime dimension. Massive particles are realized in this formalism as "dimensionally reduced" massless particles. Explicit propagators are found for any spin and dimension, including the propagators for all auxiliary fields necessary in the formalism. For spin s = n, n + 1/2, the propagators may be expressed as degree n Gegenbauer polynomials, whose asymptotic n → ∞ properties are known. This enables one to take an appropriate classical limit for particles with classically relevant spin S ∼ ℏn ≫ ℏ without extrapolation, all while using dimensional regularization.
일반주제명  
Theoretical physics
일반주제명  
Physics
일반주제명  
Applied mathematics
일반주제명  
Particle physics
일반주제명  
Computational physics
키워드  
Virasoro amplitudes
키워드  
Spinor Lorentz multiplets
키워드  
Goldstone boson
키워드  
Gegenbauer polynomials
키워드  
Massive particles
기타저자  
University of California, Los Angeles Physics 0666
기본자료저록  
Dissertations Abstracts International. 85-12B.
전자적 위치 및 접속  
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MARC

 008250123s2024        us                              c    eng  d
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■035    ▼a(MiAaPQ)AAI31330624
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530.1
■1001  ▼aLindwasser,  Lukas  William.
■24510▼aSome  Aspects  of  Massive  Higher  Spin  Particles
■260    ▼a[Sl]▼bUniversity  of  California,  Los  Angeles▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a145  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-12,  Section:  B.
■500    ▼aAdvisor:  Tomboulis,  E.  T.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  Los  Angeles,  2024.
■520    ▼aThis  dissertation  is  a  synthesis  of  work  completed  during  my  Ph.D.,  loosely  connected  by  the  appearance  of  higher  spin  particles.In  Chapter  2,  we  explicitly  construct  an  affine  generalization  of  the  Dirac  action  employing  infinite  dimensional  spinorial  representations  of  the  group.  This  implies  that  it  is  built  from  an  infinite  number  of  spinor  Lorentz  multiplets  with  all  possible  half  integer  spins.  We  introduce  a  systematic  procedure  for  constructing  GL(d,  ℝ)  and  SL(d,  ℝ)  invariant  interaction  terms  to  obtain  quite  general  interacting  models.  Such  models  have  order  operators  whose  expectation  value  can  break  affine  symmetry  to  Poincare  symmetry.  This  symmetry  breaking  pattern  is  known  to  exhibit  a  graviton  as  its  Goldstone  boson.  We  discuss  possible  interactions  and  mechanisms  for  this  symmetry  breaking  to  occur,  which  would  provide  a  dynamical  explanation  of  the  Lorentzian  signature  of  spacetime.In  Chapter  3,  we  study  consistent  deformations  of  Veneziano  and  Virasoro  amplitudes.  Under  some  physical  assumptions,  we  find  that  their  spectra  must  satisfy  an  over-determined  set  of  non-linear  recursion  relations.  The  recursion  relation  for  the  generalized  Veneziano  amplitudes  can  be  solved  analytically  and  yields  a  two-parameter  family  which  includes  the  Veneziano  amplitude,  the  one-parameter  family  of  Coon  amplitudes,  and  a  larger  two-parameter  family  of  amplitudes  with  an  infinite  tower  of  spins  at  each  mass  level.  In  the  generalized  Virasoro  case,  the  only  consistent  solution  is  the  string  spectrum.In  Chapter  4,  we  construct  a  new  formalism  for  free  massive  particles  of  any  spin,  including  integers  and  half  integers,  in  any  spacetime  dimension.  Massive  particles  are  realized  in  this  formalism  as  "dimensionally  reduced"  massless  particles.  Explicit  propagators  are  found  for  any  spin  and  dimension,  including  the  propagators  for  all  auxiliary  fields  necessary  in  the  formalism.  For  spin  s  =  n,  n  +  1/2,  the  propagators  may  be  expressed  as  degree  n  Gegenbauer  polynomials,  whose  asymptotic  n  →  ∞  properties  are  known.  This  enables  one  to  take  an  appropriate  classical  limit  for  particles  with  classically  relevant  spin  S  ∼  ℏn  ≫  ℏ  without  extrapolation,  all  while  using  dimensional  regularization. 
■590    ▼aSchool  code:  0031.
■650  4▼aTheoretical  physics
■650  4▼aPhysics
■650  4▼aApplied  mathematics
■650  4▼aParticle  physics
■650  4▼aComputational  physics
■653    ▼aVirasoro  amplitudes
■653    ▼aSpinor  Lorentz  multiplets
■653    ▼aGoldstone  boson
■653    ▼aGegenbauer  polynomials
■653    ▼aMassive  particles
■690    ▼a0753
■690    ▼a0605
■690    ▼a0798
■690    ▼a0216
■690    ▼a0364
■71020▼aUniversity  of  California,  Los  Angeles▼bPhysics  0666.
■7730  ▼tDissertations  Abstracts  International▼g85-12B.
■790    ▼a0031
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162388▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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