Dirac-particle creation by gravitational fields

1977 ◽  
Vol 16 (12) ◽  
pp. 3418-3420 ◽  
Author(s):  
M. Martellini
Keyword(s):  
Particle Creation ◽  
Dirac Particle ◽  
Gravitational Fields

Dirac particle spin in strong gravitational fields

2014 ◽  
Vol 45 (1) ◽  
pp. 234-236 ◽  
Author(s):  
Yu. N. Obukhov ◽  
A. J. Silenko ◽  
O. V. Teryaev
Keyword(s):  
Dirac Particle ◽  
Gravitational Fields ◽  
Particle Spin ◽  
Strong Gravitational Fields

scholarly journals On the Electric-Magnetic Duality Symmetry: Quantum Anomaly, Optical Helicity, and Particle Creation

Symmetry ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 763 ◽  
Author(s):  
Iván Agulló ◽  
Adrián del Río ◽  
José Navarro-Salas
Keyword(s):  
Classical Field Theory ◽  
Particle Creation ◽  
Gravitational Fields ◽  
Duality Symmetry ◽  
Spacetime Curvature ◽  
Asymmetric Quantum ◽  
Quantum Anomaly ◽  
Quantum Version ◽  
Quantum Anomalies ◽  
Physical Consequences

It is well known that not every symmetry of a classical field theory is also a symmetry of its quantum version. When this occurs, we speak of quantum anomalies. The existence of anomalies imply that some classical Noether charges are no longer conserved in the quantum theory. In this paper, we discuss a new example for quantum electromagnetic fields propagating in the presence of gravity. We argue that the symmetry under electric-magnetic duality rotations of the source-free Maxwell action is anomalous in curved spacetimes. The classical Noether charge associated with these transformations accounts for the net circular polarization or the optical helicity of the electromagnetic field. Therefore, our results describe the way the spacetime curvature changes the helicity of photons and opens the possibility of extracting information from strong gravitational fields through the observation of the polarization of photons. We also argue that the physical consequences of this anomaly can be understood in terms of the asymmetric quantum creation of photons by the gravitational field.

Particle Creation by Gravitational Fields

1976 ◽  
Vol 36 (17) ◽  
pp. 999-1001 ◽  
Author(s):  
N. M. J. Woodhouse
Keyword(s):  
Particle Creation ◽  
Gravitational Fields

Topographic surfaces and gravitational fields of the Earth, Moon and terrestrial planets

2000 ◽  
Vol 6 (1) ◽  
pp. 56-63
Author(s):  
K.K. Kamensky ◽  
V.S. Kislyuk ◽  
Ya.S. Yatskiv ◽  
◽  
Keyword(s):  
Terrestrial Planets ◽  
Gravitational Fields ◽  
The Earth
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