N = 2 PNGB quintessence dark energy

• Published in: Journal of the Korean Physical Society Vol. 79; no. 3; pp. 336 - 342
• Main Authors: Cheon, Keunsu, Lee, Jungjai
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Physical Society 01.08.2021; Springer Nature B.V; 한국물리학회
• Subjects: Big Bang theory; Broken symmetry; Dark energy; Hubble constant; Mathematical and Computational Physics; Original Paper; Particle and Nuclear Physics; Physics; Physics and Astronomy; Quintessence (cosmology); Theoretical; 물리학; Cosmic acceleration; pseudo-Nambu-Goldstone boson; Quintessence; Dark Energy
• ISSN: 0374-4884; 1976-8524
• DOI: 10.1007/s40042-021-00235-7

In this paper, we show that a pseudo-Nambu–Goldstone boson (PNGB) quintessence of spontaneous symmetry breaking (SSB) is responsible for an epoch of late-time cosmic acceleration. We suggest that an N = 2PNGB quintessence with SSB can give rise to the fast-roll cosmic acceleration in the evolution of the Universe. In the N = 2 PNGB quintessence model, the standard slow-roll condition in which the absolute value of the tachyonic mass squared | m q 2 | of this model is much less than the square of the Hubble constant H 2 , is broken down to the fast-roll condition, | m q 2 | = O ( H 2 ) . However, the fast-rolling associated with the N = 2 PNGB quintessence of SSB is shown to lead to the epoch of late-time cosmic acceleration. Indeed, in our PNGB model, this epoch can be quite long-lasting because the mass of the N = 2 PNGB quintessence field is extremely small at m q ≈ 10 - 33 eV .