Fermions, loop quantum gravity and geometry

被引:0
作者
Chakravarty, Nabajit [1 ,2 ]
Mullick, Lipika [3 ]
Bandyopadhyay, Pratul [4 ]
机构
[1] Posit Astron Ctr, Block AQ,Plot 8,Sect 5, Kolkata 700091, India
[2] Univ Calcutta, Univ Coll Sci & Technol, Dept Appl Opt & Photon, JD 2,Sect 3, Kolkata 700098, India
[3] Mem Coll Women, Dept Math, Hiralal Mazumdar, Kolkata 700035, India
[4] Indian Stat Inst, Phys & Appl Math Unit, 203 BT Rd, Kolkata 700108, India
来源
INTERNATIONAL JOURNAL OF MODERN PHYSICS D | 2017年 / 26卷 / 11期
关键词
Fermions; holonomy-flux phase space; geometry; ABELIAN GAUGE STRUCTURE; QUANTIZATION; DEFORMATION; MECHANICS; FIELD;
D O I
10.1142/S021827181750122X
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We discuss here the geometry associated with the loop quantum gravity when it is considered to be generated from fermionic degrees of freedom. It is pointed out that a closed loop having the holonomy associated with the SU(2) gauge group is realized from the rotation of the direction vector associated with the quantization of a fermion depicting the spin degrees of freedom. During the formation of a loop a noncyclic path with open ends can be mapped onto a closed loop when the holonomy involves q-deformed gauge group SUq(2). In this case, the spinorial variable attached to a node of a link is a quasispinor equipped with quasispin associated with the SUq(2) group. The quasispinors essentially correspond to the fermions attached to the end points of an open path in loop space. We can consider adiabatic iteration such that the quasispin associated with the SUq(2) group gradually evolves as the time dependent deformation parameter q changes and we have the holonomy associated with the SU(2) group in the limit q = 1. In this way we can have a continuous geometry developed through a sequence of q-deformed holonomy-flux phase space variables which leads to a continuous gravitational field. Also it is pointed out that for a truncated general relativity given by loop quantum gravity on a fixed graph we can achieve twisted geometry and Regge geometry.
引用
收藏
页数:16
相关论文
共 30 条
[1]   STOCHASTIC QUANTIZATION OF A FERMI FIELD - FERMIONS AS SOLITONS [J].
BANDYOPADHYAY, P ;
HAJRA, K .
JOURNAL OF MATHEMATICAL PHYSICS, 1987, 28 (03) :711-716
[2]  
Bandyopadhyay P, 2000, INT J MOD PHYS A, V15, P4107, DOI 10.1142/S0217751X00002974
[3]  
Battisti MV, 2010, PHYS REV D, V81, DOI 10.1103/PhysRevD.81.064019
[5]  
Bianchi E., ARXIV10033483
[6]   From lattice BF gauge theory to area-angle Regge calculus [J].
Bonzom, Valentin .
CLASSICAL AND QUANTUM GRAVITY, 2009, 26 (15)
[7]  
Brzezinski T., 1992, P 19 INT C GROUP THE, V1, P75
[8]  
DITTRICH B, ARXIV08072806
[9]   Discrete Gravity Models and Loop Quantum Gravity: a Short Review [J].
Dupuis, Maite ;
Ryan, James P. ;
Speziale, Simone .
SYMMETRY INTEGRABILITY AND GEOMETRY-METHODS AND APPLICATIONS, 2012, 8
[10]   Twistors to twisted geometries [J].
Freidel, Laurent ;
Speziale, Simone .
PHYSICAL REVIEW D, 2010, 82 (08)