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Kinetic Modeling of Relativistic Turbulencewith Application to Astrophysical Jets
Kinetic Modeling of Relativistic Turbulencewith Application to Astrophysical Jets
Kinetic Modeling of Relativistic Turbulencewith Application to Astrophysical Jets

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211152048
ISBN  
9798342106481
DDC  
500
저자명  
Davis, Zachary.
서명/저자  
Kinetic Modeling of Relativistic Turbulencewith Application to Astrophysical Jets
발행사항  
[Sl] : Purdue University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
126 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-04, Section: B.
주기사항  
Advisor: Giannios, Dimitrios.
학위논문주기  
Thesis (Ph.D.)--Purdue University, 2024.
초록/해제  
요약Understanding the acceleration of particles responsible for high-energy non-thermal phenomena in astrophysical jets is a ubiquitous pursuit. A possible culprit for non-thermal particle acceleration is turbulence. Specifically in this thesis, I investigate highly magne- tized or relativisticturbulence, where the magnetic energy to enthalpy ratio of the plasma is much greater than one, as a possible high-energy accelerator inside relativistic jets. I do this through three distinct projects.My first project [1] (discussed in Section 3) was built upon a recent study of relativistic turbulence from [2], which found that a non-thermal particle equilibrium can be achieved when a plasma is heated via turbulence but allowed to cool radiatively. I extrapolated these results from PIC (Particle-in-Cell) simulations to larger scales and magnetizations, allowing me to encode key microphysical results of PIC simulations into a Fokker-Planck formalism. Combining these results with a single zone model for a blazar jet, I successfully define the underlying particle distribution with the global parameters of the emission region. To test this model, I fit data from 12 sources and successfully constrain key blazar parameters such as magnetization, bulk Lorentz factor, emission region size, and distance from the central engine.My second project covers the development and testing of the open-source toolkit Tleco. This code base was used to evolve the Fokker-Planck equation and solve the resultant emission in my first project. Tleco offers efficient algorithms for evolving particle distributions and solving the resultant emission. It is meant to be user-friendly and easily customizable.My third project attempts to enhance our understanding of coherent structures in relativistic turbulence. I employ intermittency analysis to establish a link between statistical fluctuations within the plasma and regions of high-energy dissipation. To achieve this, we used first-principle turbulent PIC simulations across a range of magnetizations and fluctuating magnetic field values. By utilizing the statistical fluctuations to determine the fractal dimension of the structures, I then examine their filling fraction and its dependence on magnetization and the fluctuating magnetic field.
일반주제명  
Plasma
일반주제명  
Energy
일반주제명  
Cooling
일반주제명  
Charged particles
일반주제명  
Black holes
일반주제명  
Magnetic fields
일반주제명  
Radiation
일반주제명  
Atoms & subatomic particles
일반주제명  
Astronomy
일반주제명  
Astrophysics
일반주제명  
Atomic physics
일반주제명  
Electromagnetics
일반주제명  
Theoretical physics
기타저자  
Purdue University.
기본자료저록  
Dissertations Abstracts International. 86-04B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aDavis,  Zachary.
■24510▼aKinetic  Modeling  of  Relativistic  Turbulencewith  Application  to  Astrophysical  Jets
■260    ▼a[Sl]▼bPurdue  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a126  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-04,  Section:  B.
■500    ▼aAdvisor:  Giannios,  Dimitrios.
■5021  ▼aThesis  (Ph.D.)--Purdue  University,  2024.
■520    ▼aUnderstanding  the  acceleration  of  particles  responsible  for  high-energy  non-thermal  phenomena  in  astrophysical  jets  is  a  ubiquitous  pursuit.  A  possible  culprit  for  non-thermal  particle  acceleration  is  turbulence.  Specifically  in  this  thesis,  I  investigate  highly  magne-  tized  or  relativisticturbulence,  where  the  magnetic  energy  to  enthalpy  ratio  of  the  plasma  is  much  greater  than  one,  as  a  possible  high-energy  accelerator  inside  relativistic  jets.  I  do  this  through  three  distinct  projects.My  first  project  [1]  (discussed  in  Section  3)  was  built  upon  a  recent  study  of  relativistic  turbulence  from  [2],  which  found  that  a  non-thermal  particle  equilibrium  can  be  achieved  when  a  plasma  is  heated  via  turbulence  but  allowed  to  cool  radiatively.  I  extrapolated  these  results  from  PIC  (Particle-in-Cell)  simulations  to  larger  scales  and  magnetizations,  allowing  me  to  encode  key  microphysical  results  of  PIC  simulations  into  a  Fokker-Planck  formalism.  Combining  these  results  with  a  single  zone  model  for  a  blazar  jet,  I  successfully  define  the  underlying  particle  distribution  with  the  global  parameters  of  the  emission  region.  To  test  this  model,  I  fit  data  from  12  sources  and  successfully  constrain  key  blazar  parameters  such  as  magnetization,  bulk  Lorentz  factor,  emission  region  size,  and  distance  from  the  central  engine.My  second  project  covers  the  development  and  testing  of  the  open-source  toolkit  Tleco.  This  code  base  was  used  to  evolve  the  Fokker-Planck  equation  and  solve  the  resultant  emission  in  my  first  project.  Tleco  offers  efficient  algorithms  for  evolving  particle  distributions  and  solving  the  resultant  emission.  It  is  meant  to  be  user-friendly  and  easily  customizable.My  third  project  attempts  to  enhance  our  understanding  of  coherent  structures  in  relativistic  turbulence.  I  employ  intermittency  analysis  to  establish  a  link  between  statistical  fluctuations  within  the  plasma  and  regions  of  high-energy  dissipation.  To  achieve  this,  we  used  first-principle  turbulent  PIC  simulations  across  a  range  of  magnetizations  and  fluctuating  magnetic  field  values.  By  utilizing  the  statistical  fluctuations  to  determine  the  fractal  dimension  of  the  structures,  I  then  examine  their  filling  fraction  and  its  dependence  on  magnetization  and  the  fluctuating  magnetic  field.
■590    ▼aSchool  code:  0183.
■650  4▼aPlasma
■650  4▼aEnergy
■650  4▼aCooling
■650  4▼aCharged  particles
■650  4▼aBlack  holes
■650  4▼aMagnetic  fields
■650  4▼aRadiation
■650  4▼aAtoms  &  subatomic  particles
■650  4▼aAstronomy
■650  4▼aAstrophysics
■650  4▼aAtomic  physics
■650  4▼aElectromagnetics
■650  4▼aTheoretical  physics
■690    ▼a0791
■690    ▼a0606
■690    ▼a0596
■690    ▼a0748
■690    ▼a0607
■690    ▼a0753
■71020▼aPurdue  University.
■7730  ▼tDissertations  Abstracts  International▼g86-04B.
■790    ▼a0183
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162737▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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