2008/12/31 by Marcin Kaźmierczak
Physics and Astronomy · #Ambiguity #Black Holes and Theoretical Physics #Classical mechanics #Context (archaeology) #Cosmology and Gravitation Theories #Einstein #Fermion #Formalism (music) #Gravitation #Immirzi parameter #Loop quantum gravity #Mathematical physics #Noncommutative and Quantum Gravity Theories #Philosophy #Physics #Quantum #Quantum gravity #Quantum mechanics #Semiclassical gravity #Semiclassical physics #Theoretical physics #gr-qc
paper · pdf · doi:10.1103/physrevd.79.064029
published as Phys.Rev.D79:064029,2009 · 11 pages, typos corrected, final version, to appear in Phys. Rev. D
arxiv created 2009/03/25 · openalex publication_date 2009/03/26 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We investigate the consequences of the ambiguity of the minimal coupling procedure for Einstein-Cartan gravity with the Holst term and fermions. A new insight is provided into the nature and physical relevance of coupling procedures considered hitherto in the context of Ashtekar-Barbero-Immirzi formalism with fermions. The issue of physical effects of the Immirzi parameter in semiclassical theory is reinvestigated. We argue that the conclusive answer to the question of its measurability will not be possible until the more fundamental problem of nonuniqueness of gravity-induced fermion interaction in Einstein-Cartan theory is solved.