{"version":"1.0","type":"link","title":"Background field method - Newikis","description":"In theoretical physics, background field method is a useful procedure to calculate the effective action of a quantum field theory by expanding a quantum field around a classical \"background\" value B:","provider_name":"Newikis","provider_url":"https://newikis.com","cache_age":86400,"thumbnail_url":"https://thumb.wikimedia.org/wikipedia/commons/thumb/0/00/Feynman_Diagram_Gluon_Radiation.svg/1280px-Feynman_Diagram_Gluon_Radiation.svg.png","thumbnail_width":1280,"thumbnail_height":800}