Feynman Diagram

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2019 Nov 5 3:14
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2026 Jun 25 14:15

Feynman rule

 
In a Feynman diagram, the horizontal axis represents space and the vertical axis represents time, although the horizontal axis does not literally measure distance. A typical diagram shows electrons that approach each other, interact, and then move apart. Because the probability drops by roughly a factor of 100 with each additional vertex, the higher-order contributions fall off so quickly that they effectively tame the infinities.
 
Solving quantum mechanics: the process of removing infinities
 
By the uncertainty principle, apart from the observable incoming and outgoing particles, the infinitely many possible particles exchanged during an interaction can move in ways that ignore relativity, including particles that travel backward in time or faster than light. Mathematically, a particle moving backward in time is exactly equivalent to an antiparticle, although the antiparticle of a photon is the photon itself. Unlike Dirac, Feynman did not interpret negative energy as a sea of negative-energy particles; instead, he regarded it as a particle with positive energy but negative time, that is, an antiparticle.
 
 
 
2024's Biggest Breakthroughs in Physics
The year's biggest breakthroughs in physics included evidence that dark energy may be weakening, the discovery of a supersolid, and new advances in quantum geometry. Read more at Quanta Magazine: https://www.quantamagazine.org/the-year-in-physics-20241217 0:06 - Weakening Dark Energy A generation of physicists has referred to the dark energy that permeates the universe as “the cosmological constant.” Now, the Dark Energy Spectroscopic Instrument (DESI) has produced the largest map of the cosmos to date — hinting that this mysterious energy has been changing over billions of years. Read more: https://www.quantamagazine.org/dark-energy-may-be-weakening-major-astrophysics-study-finds-20240404/ 5:51 - Supersolids in the Lab New observations of microscopic vortices, known as quantum tornadoes, confirm the existence of a paradoxical phase of matter that may also arise inside neutron stars. https://www.quantamagazine.org/physicists-spot-quantum-tornadoes-twirling-in-a-supersolid-20241106/ 11:09 - Quantum Geometry A decade after discovering the "amplituhedron," physicists have excavated more of the timeless geometry underlying the standard picture of how particles move. A new shape called the "associahedron" gives an alternative to calculating scattering amplitudes with Feynman diagrams. https://www.quantamagazine.org/physicists-reveal-a-quantum-geometry-that-exists-outside-of-space-and-time-20240925/ - VISIT our website: https://www.quantamagazine.org - LIKE us on Facebook: https://www.facebook.com/QuantaNews - FOLLOW us on Twitter: https://twitter.com/QuantaMagazine Quanta Magazine is an editorially independent publication supported by the Simons Foundation: https://www.simonsfoundation.org/
2024's Biggest Breakthroughs in Physics
편미분 방정식을 이용한 양자장 이론의 건설 [2]: 재규격화와 파인만 다이어그램
1. 수학자와 물리학자에게 있어서의 재규격화 학부 수학 과목 수업을 하다 보면 학생들이 종종 학부 내용을 넘어선 질문을 하는데 그럴 때마다 어떻게 답해야 할지 항상 고민이 많이 됩니다. 이번 학기에 가르치는 학부 3, 4학년 대상인 수업에서 학생들이 대학원 과정이 필요한 내용을 물어보면, 수학적으로 정확하면서도 학부 수준에서 받아들일 수 있는 답을 해줘야 합니다. 학생들이 자연스럽게 받아들여 이해하기…
편미분 방정식을 이용한 양자장 이론의 건설 [2]: 재규격화와 파인만 다이어그램
 

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