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Scattering Amplitudes and the Double-Copy Landscape
Scattering Amplitudes and the Double-Copy Landscape
Scattering Amplitudes and the Double-Copy Landscape

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자료유형  
 학위논문 서양
최종처리일시  
20260202103638
ISBN  
9798314873342
DDC  
530
저자명  
Chen, Shih-Kuan.
서명/저자  
Scattering Amplitudes and the Double-Copy Landscape
발행사항  
[Sl] : University of Michigan, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
94 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
주기사항  
Advisor: Elvang, Henriette.
학위논문주기  
Thesis (Ph.D.)--University of Michigan, 2025.
초록/해제  
요약The double copy is a well-known relation between gauge and gravitational theories at the level of scattering amplitudes, allowing color-ordered amplitudes from two gauge theories to be combined via a double-copy kernel to yield the amplitude of a third gravitational theory. This is a surprising result, as straightforwardly multiplying two amplitudes could violate the factorization property of scattering amplitudes. Consistency of double copy demands that the multiplicative rule incorporate an identity model, which is realized in field-theory double copy by the bi-adjoint scalar theory (BAS). In this work, we explore the generalization of the double copy in the context of effective field theories (EFTs). Previous studies demonstrated that for any legitimate generalized double copy, the identity model corresponds to a bi-adjoint scalar EFT (BAS EFT) whose amplitude must exhibit "minimal rank." We bootstrap these BAS EFT identity models by imposing the minimal rank condition and discover that, at 6 points, compatibility with factorization significantly restricts the solutions to a form resembling string theory. Specifically, we introduce a class of solutions termed "hybrid models," which satisfy the field-theory Kleiss-Kuijf (KK) and Bern-Carrasco-Johansson (BCJ) relations for one of the two color orderings. Remarkably, the other color ordering is then found to exhibit an emergent set of linear relations, as verified at 4 points to 36-derivative order and 5 points to 12-derivative order, precisely the string monodromy relations. Furthermore, we demonstrate that these hybrid models are nothing but a slight generalization of the Z-theories, if one treats the multiple zeta values (MZVs) in the low-energy expansion of the Z-theory amplitude as free parameters. We propose that general BAS EFT identity models can be written as a field-theory double copy of two hybrid models, and we provide numerical evidence at 4, 5, and 6 points. Our study suggests that the only consistent generalization of double copy must manifest string-theory-like structures, highlighting a close connection to MZVs and number theory.
일반주제명  
Physics
일반주제명  
High temperature physics
일반주제명  
Theoretical physics
키워드  
Scattering amplitudes
키워드  
High-energy theoretical physics
키워드  
Effective field theories
키워드  
Multiple zeta values
키워드  
Hybrid models
기타저자  
University of Michigan Physics
기본자료저록  
Dissertations Abstracts International. 86-11B.
전자적 위치 및 접속  
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MARC

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■006m          o    d                
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■020    ▼a9798314873342
■035    ▼a(MiAaPQ)AAI32092491
■035    ▼a(MiAaPQ)umichrackham006148
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aChen,  Shih-Kuan.
■24510▼aScattering  Amplitudes  and  the  Double-Copy  Landscape
■260    ▼a[Sl]▼bUniversity  of  Michigan▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a94  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-11,  Section:  B.
■500    ▼aAdvisor:  Elvang,  Henriette.
■5021  ▼aThesis  (Ph.D.)--University  of  Michigan,  2025.
■520    ▼aThe  double  copy  is  a  well-known  relation  between  gauge  and  gravitational  theories  at  the  level  of  scattering  amplitudes,  allowing  color-ordered  amplitudes  from  two  gauge  theories  to  be  combined  via  a  double-copy  kernel  to  yield  the  amplitude  of  a  third  gravitational  theory.  This  is  a  surprising  result,  as  straightforwardly  multiplying  two  amplitudes  could  violate  the  factorization  property  of  scattering  amplitudes.  Consistency  of  double  copy  demands  that  the  multiplicative  rule  incorporate  an  identity  model,  which  is  realized  in  field-theory  double  copy  by  the  bi-adjoint  scalar  theory  (BAS).  In  this  work,  we  explore  the  generalization  of  the  double  copy  in  the  context  of  effective  field  theories  (EFTs).  Previous  studies  demonstrated  that  for  any  legitimate  generalized  double  copy,  the  identity  model  corresponds  to  a  bi-adjoint  scalar  EFT  (BAS  EFT)  whose  amplitude  must  exhibit  "minimal  rank."  We  bootstrap  these  BAS  EFT  identity  models  by  imposing  the  minimal  rank  condition  and  discover  that,  at  6  points,  compatibility  with  factorization  significantly  restricts  the  solutions  to  a  form  resembling  string  theory.  Specifically,  we  introduce  a  class  of  solutions  termed  "hybrid  models,"  which  satisfy  the  field-theory  Kleiss-Kuijf  (KK)  and  Bern-Carrasco-Johansson  (BCJ)  relations  for  one  of  the  two  color  orderings.  Remarkably,  the  other  color  ordering  is  then  found  to  exhibit  an  emergent  set  of  linear  relations,  as  verified  at  4  points  to  36-derivative  order  and  5  points  to  12-derivative  order,  precisely  the  string  monodromy  relations.  Furthermore,  we  demonstrate  that  these  hybrid  models  are  nothing  but  a  slight  generalization  of  the  Z-theories,  if  one  treats  the  multiple  zeta  values  (MZVs)  in  the  low-energy  expansion  of  the  Z-theory  amplitude  as  free  parameters.  We  propose  that  general  BAS  EFT  identity  models  can  be  written  as  a  field-theory  double  copy  of  two  hybrid  models,  and  we  provide  numerical  evidence  at  4,  5,  and  6  points.  Our  study  suggests  that  the  only  consistent  generalization  of  double  copy  must  manifest  string-theory-like  structures,  highlighting  a  close  connection  to  MZVs  and  number  theory.
■590    ▼aSchool  code:  0127.
■650  4▼aPhysics
■650  4▼aHigh  temperature  physics
■650  4▼aTheoretical  physics
■653    ▼aScattering  amplitudes
■653    ▼aHigh-energy  theoretical  physics
■653    ▼aEffective  field  theories
■653    ▼aMultiple  zeta  values
■653    ▼aHybrid  models
■690    ▼a0605
■690    ▼a0753
■690    ▼a0597
■71020▼aUniversity  of  Michigan▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g86-11B.
■790    ▼a0127
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358063▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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