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On the Infrared and Ultraviolet Behavior of Scattering Amplitudes and Wavefunctions- [electronic resource]
On the Infrared and Ultraviolet Behavior of Scattering Amplitudes and Wavefunctions - [ele...
On the Infrared and Ultraviolet Behavior of Scattering Amplitudes and Wavefunctions- [electronic resource]

Detailed Information

자료유형  
 학위논문파일 국외
최종처리일시  
20240214101647
ISBN  
9798380416238
DDC  
530.1
저자명  
Hillman, Aaron Jonathan.
서명/저자  
On the Infrared and Ultraviolet Behavior of Scattering Amplitudes and Wavefunctions - [electronic resource]
발행사항  
[S.l.]: : Princeton University., 2023
발행사항  
Ann Arbor : : ProQuest Dissertations & Theses,, 2023
형태사항  
1 online resource(177 p.)
주기사항  
Source: Dissertations Abstracts International, Volume: 85-03, Section: B.
주기사항  
Advisor: Arkani-Hamed, Nima.
학위논문주기  
Thesis (Ph.D.)--Princeton University, 2023.
사용제한주기  
This item must not be sold to any third party vendors.
초록/해제  
요약We extend the on-shell program on three fronts: finite Λ, finite ϵ, and finite α' where these are the cosmological constant, the dimensional regularization parameter ϵ = 4−D/2 , and a scale for putative ultraviolet completions of tree-level amplitudes with graviton exchange (string scale) respectively. In the first case we study conformally coupled scalars in the associated de Sitter background, whose wavefunction contributions are transcendental functions of uniform weight and are closely related to the density perturbations of direct interest for studying inflation. We derive a recursive rule for the symbol of such functions and study the implications for singularities, differential equations, and identify the symbol letters with graph associahedra. Most of this work appeared in [1]. In the second case we study the structure of UV and IR divergences for scalar Feynman integrals in the context of Feynman polytopes and tropical fans, providing a unified description for both and a prescription to compute the leading divergence. In the IR case we apply this to the study of infinite classes of diagrams appearing in the expansion of the four-point amplitude in N = 4 SYM. This is based on work with Nima Arkani-Hamed and Sebastian Mizera. In the case of UV divergences we introduce u-variables which realize an associated binary geometry and facilitate a novel subtraction scheme in dimensional regularization to compute the full Laurent expansion of the associated Feynman integral. On the third front, we consider unitarity constraints on a class of tree-level UV completions of amplitudes with graviton exchange. In particular we study completions of Higgs scattering and gauge boson scattering in the Standard Model and gauge boson scattering in diverse dimensions. We find surprising constraints connecting with intuitions from the swampland. This is based on work with Brad Bachu.
일반주제명  
Theoretical physics.
일반주제명  
Physics.
일반주제명  
Quantum physics.
키워드  
Infrared
키워드  
Renormalization
키워드  
Scattering amplitudes
키워드  
Ultraviolet behavior
기타저자  
Princeton University Physics
기본자료저록  
Dissertations Abstracts International. 85-03B.
기본자료저록  
Dissertation Abstract International
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■00520240214101647
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■020    ▼a9798380416238
■035    ▼a(MiAaPQ)AAI30633794
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530.1
■1001  ▼aHillman,  Aaron  Jonathan.
■24510▼aOn  the  Infrared  and  Ultraviolet  Behavior  of  Scattering  Amplitudes  and  Wavefunctions▼h[electronic  resource]
■260    ▼a[S.l.]:▼bPrinceton  University.  ▼c2023
■260  1▼aAnn  Arbor  :▼bProQuest  Dissertations  &  Theses,  ▼c2023
■300    ▼a1  online  resource(177  p.)
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-03,  Section:  B.
■500    ▼aAdvisor:  Arkani-Hamed,  Nima.
■5021  ▼aThesis  (Ph.D.)--Princeton  University,  2023.
■506    ▼aThis  item  must  not  be  sold  to  any  third  party  vendors.
■520    ▼aWe  extend  the  on-shell  program  on  three  fronts:  finite  Λ,  finite  ϵ,  and  finite  α'  where  these  are  the  cosmological  constant,  the  dimensional  regularization  parameter  ϵ  =  4−D/2  ,  and  a  scale  for  putative  ultraviolet  completions  of  tree-level  amplitudes  with  graviton  exchange  (string  scale)  respectively.  In  the  first  case  we  study  conformally  coupled  scalars  in  the  associated  de  Sitter  background,  whose  wavefunction  contributions  are  transcendental  functions  of  uniform  weight  and  are  closely  related  to  the  density  perturbations  of  direct  interest  for  studying  inflation.  We  derive  a  recursive  rule  for  the  symbol  of  such  functions  and  study  the  implications  for  singularities,  differential  equations,  and  identify  the  symbol  letters  with  graph  associahedra.  Most  of  this  work  appeared  in  [1].  In  the  second  case  we  study  the  structure  of  UV  and  IR  divergences  for  scalar  Feynman  integrals  in  the  context  of  Feynman  polytopes  and  tropical  fans,  providing  a  unified  description  for  both  and  a  prescription  to  compute  the  leading  divergence.  In  the  IR  case  we  apply  this  to  the  study  of  infinite  classes  of  diagrams  appearing  in  the  expansion  of  the  four-point  amplitude  in  N  =  4  SYM.  This  is  based  on  work  with  Nima  Arkani-Hamed  and  Sebastian  Mizera.  In  the  case  of  UV  divergences  we  introduce  u-variables  which  realize  an  associated  binary  geometry  and  facilitate  a  novel  subtraction  scheme  in  dimensional  regularization  to  compute  the  full  Laurent  expansion  of  the  associated  Feynman  integral.  On  the  third  front,  we  consider  unitarity  constraints  on  a  class  of  tree-level  UV  completions  of  amplitudes  with  graviton  exchange.  In  particular  we  study  completions  of  Higgs  scattering  and  gauge  boson  scattering  in  the  Standard  Model  and  gauge  boson  scattering  in  diverse  dimensions.  We  find  surprising  constraints  connecting  with  intuitions  from  the  swampland.  This  is  based  on  work  with  Brad  Bachu.
■590    ▼aSchool  code:  0181.
■650  4▼aTheoretical  physics.
■650  4▼aPhysics.
■650  4▼aQuantum  physics.
■653    ▼aInfrared
■653    ▼aRenormalization
■653    ▼aScattering  amplitudes
■653    ▼aUltraviolet  behavior
■690    ▼a0753
■690    ▼a0599
■690    ▼a0605
■71020▼aPrinceton  University▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g85-03B.
■773    ▼tDissertation  Abstract  International
■790    ▼a0181
■791    ▼aPh.D.
■792    ▼a2023
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16934731▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.
■980    ▼a202402▼f2024

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