TY  - JOUR
AU  - Delhom, A.
PY  - 2020
DA  - 2020//
TI  - Minimal coupling in presence of non-metricity and torsion
T2  - Eur. Phys. J. C
JO  - European Physical Journal C
SP  - 728 - 17pp
VL  - 80
IS  - 8
PB  - Springer
AB  - We deal with the question of what it means to define a minimal coupling prescription in presence of torsion and/or non-metricity, carefully explaining while the naive substitution partial derivative -> del introduces extra couplings between the matter fields and the connection that can be regarded as non-minimal in presence of torsion and/or non-metricity. We will also investigate whether minimal coupling prescriptions at the level of the action (MCPL) or at the level of field equations (MCPF) lead to different dynamics. To that end, we will first write the Euler-Lagrange equations for matter fields in terms of the covariant derivatives of a general non-Riemannian space, and derivate the form of the associated Noether currents and charges. Then we will see that if the minimal coupling prescriptions is applied as we discuss, for spin 0 and 1 fields the results of MCPL and MCPF are equivalent, while for spin 1/2 fields there is a difference if one applies the MCPF or the MCPL, since the former leads to charge violation.
SN  - 1434-6044
UR  - https://arxiv.org/abs/2002.02404
UR  - https://doi.org/10.1140/epjc/s10052-020-8330-y
DO  - 10.1140/epjc/s10052-020-8330-y
LA  - English
N1  - WOS:000561952300005
ID  - Delhom2020
ER  -