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Soft Theorems from Spontaneous Symmetry Breaking
Soft Theorems from Spontaneous Symmetry Breaking
Soft Theorems from Spontaneous Symmetry Breaking

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202104756
ISBN  
9798290650777
DDC  
530
저자명  
Derda, Maria.
서명/저자  
Soft Theorems from Spontaneous Symmetry Breaking
발행사항  
[Sl] : California Institute of Technology, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
134 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
주기사항  
Advisor: Cheung, Clifford.
학위논문주기  
Thesis (Ph.D.)--California Institute of Technology, 2025.
초록/해제  
요약Spontaneous symmetry breaking occurs when the vacuum state is not preserved under (a subset of) symmetries in the theory. Instead, the symmetry is non-linearly realized by the associated massless degrees of freedom, the Nambu-Goldstone bosons. At the level of on-shell observables, the non-linearly realized symmetry is manifested as a universal structure of scattering amplitudes in the so-called soft limit, which means sending the momenta of a Nambu-Goldstone modes to zero.In this dissertation, we further explore the link between spontaneous symmetry breaking and infrared dynamics of massless scalars. First, we derive soft theorems for theories with spontaneously broken Poincare symmetries, corresponding to effective field theories for condensed matter systems such as solids, fluids, superfluids, and framids. We also implement a bootstrap in which the enhanced vanishing of amplitudes in the soft limit is taken as an input, thus sculpting out a subclass of exceptional solid, fluid, and framid theories.Next, we consider spontaneous breaking of higher symmetries. We derive a new sub-leading double soft pion theorem in theories with a spontaneously-broken continuous 2-group global symmetry, which intertwines amplitudes with different numbers of pions and photons. We also provide a novel derivation of the leading soft photon theorem from the Ward identity of an emergent 1-form global symmetry in effective field theories where antiparticles are integrated out.Finally, we turn to universal features in low-energy dynamics of generic effective field theories. We extend the scalar geometric soft theorem by allowing the massless scalar to couple to other scalars, fermions, and gauge bosons. The soft theorem keeps its geometric form, but where the field-space geometry now involves the full field content of the theory. As a bonus, we also present novel double soft theorems with fermions, which mimic the geometric structure of the double soft theorem for scalars.
일반주제명  
Spacetime
일반주제명  
Energy
일반주제명  
Algebra
일반주제명  
Coordinate transformations
일반주제명  
Theorems
일반주제명  
Geometry
일반주제명  
Superfluidity
일반주제명  
Atoms & subatomic particles
일반주제명  
Symmetry
기타저자  
California Institute of Technology Physics Mathematics and Astronomy
기본자료저록  
Dissertations Abstracts International. 87-01B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■006m          o    d                
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■020    ▼a9798290650777
■035    ▼a(MiAaPQ)AAI32151383
■035    ▼a(MiAaPQ)Caltech17365
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aDerda,  Maria.
■24510▼aSoft  Theorems  from  Spontaneous  Symmetry  Breaking
■260    ▼a[Sl]▼bCalifornia  Institute  of  Technology▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a134  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-01,  Section:  B.
■500    ▼aAdvisor:  Cheung,  Clifford.
■5021  ▼aThesis  (Ph.D.)--California  Institute  of  Technology,  2025.
■520    ▼aSpontaneous  symmetry  breaking  occurs  when  the  vacuum  state  is  not  preserved  under  (a  subset  of)  symmetries  in  the  theory.  Instead,  the  symmetry  is  non-linearly  realized  by  the  associated  massless  degrees  of  freedom,  the  Nambu-Goldstone  bosons.  At  the  level  of  on-shell  observables,  the  non-linearly  realized  symmetry  is  manifested  as  a  universal  structure  of  scattering  amplitudes  in  the  so-called  soft  limit,  which  means  sending  the  momenta  of  a  Nambu-Goldstone  modes  to  zero.In  this  dissertation,  we  further  explore  the  link  between  spontaneous  symmetry  breaking  and  infrared  dynamics  of  massless  scalars.  First,  we  derive  soft  theorems  for  theories  with  spontaneously  broken  Poincare  symmetries,  corresponding  to  effective  field  theories  for  condensed  matter  systems  such  as  solids,  fluids,  superfluids,  and  framids.  We  also  implement  a  bootstrap  in  which  the  enhanced  vanishing  of  amplitudes  in  the  soft  limit  is  taken  as  an  input,  thus  sculpting  out  a  subclass  of  exceptional  solid,  fluid,  and  framid  theories.Next,  we  consider  spontaneous  breaking  of  higher  symmetries.  We  derive  a  new  sub-leading  double  soft  pion  theorem  in  theories  with  a  spontaneously-broken  continuous  2-group  global  symmetry,  which  intertwines  amplitudes  with  different  numbers  of  pions  and  photons.  We  also  provide  a  novel  derivation  of  the  leading  soft  photon  theorem  from  the  Ward  identity  of  an  emergent  1-form  global  symmetry  in  effective  field  theories  where  antiparticles  are  integrated  out.Finally,  we  turn  to  universal  features  in  low-energy  dynamics  of  generic  effective  field  theories.  We  extend  the  scalar  geometric  soft  theorem  by  allowing  the  massless  scalar  to  couple  to  other  scalars,  fermions,  and  gauge  bosons.  The  soft  theorem  keeps  its  geometric  form,  but  where  the  field-space  geometry  now  involves  the  full  field  content  of  the  theory.  As  a  bonus,  we  also  present  novel  double  soft  theorems  with  fermions,  which  mimic  the  geometric  structure  of  the  double  soft  theorem  for  scalars.
■590    ▼aSchool  code:  0037.
■650  4▼aSpacetime
■650  4▼aEnergy
■650  4▼aAlgebra
■650  4▼aCoordinate  transformations
■650  4▼aTheorems
■650  4▼aGeometry
■650  4▼aSuperfluidity
■650  4▼aAtoms  &  subatomic  particles
■650  4▼aSymmetry
■690    ▼a0791
■71020▼aCalifornia  Institute  of  Technology▼bPhysics,  Mathematics  and  Astronomy.
■7730  ▼tDissertations  Abstracts  International▼g87-01B.
■790    ▼a0037
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358816▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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