Journal article
Axion sourcing in dense stellar matter via CP -violating couplings
F Anzuini, A Gómez-Bañón, JA Pons, A Melatos, PD Lasky
Physical Review D | AMER PHYSICAL SOC | Published : 2024
Abstract
Compact objects such as neutron stars and white dwarfs can source axionlike particles and QCD axions due to CP-violating axion-fermion couplings. The magnitude of the axion field depends on the stellar density and on the strength of the axion-fermion couplings. We show that even CP-violating couplings one order of magnitude smaller than existing constraints source extended axion field configurations. For axionlike particles, the axion energy is comparable to the magnetic energy in neutron stars with inferred magnetic fields of the order of 1013 G and exceeds by more than one order of magnitude the magnetic energy content of white dwarfs with inferred fields of the order of 104 G. On the othe..
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Grants
Awarded by European Social Fund Plus
Funding Acknowledgements
F. A. thanks Anthony W. Thomas, Koichi Hamaguchi, Federico Bianchini, and Davide Guerra for fruitful dis- cussions. We also thank the anonymous referee for useful comments. F. A., P. D. L., and A. M. are supported by the Australian Research Council (ARC) Centre of Excellence for Gravitational Wave Discovery (OzGrav) , through Project No. CE170100004. P. D. L. is supported through ARC Discovery Project DP220101610. J. A. P. and A. G. acknowledge support from the Generalitat Valenciana Grants No. ASFAE/2022/026 (with funding from NextGenerationEU PRTR-C17.I1) and CIPROM/2022/13, and from the AEI Grant No. PID2021-127495NB- I00 funded by MCIN/AEI/10.13039/501100011033 and by " ESF Investing in your future. "