TY  - JOUR
AU  - Maji, R.
AU  - Park, W. I.
PY  - 2024
DA  - 2024//
TI  - Supersymmetric U(1)B-L flat direction and NANOGrav 15 year data
T2  - J. Cosmol. Astropart. Phys.
JO  - Journal of Cosmology and Astroparticle Physics
SP  - 015
EP  - 19pp
VL  - 01
IS  - 1
PB  - IOP Publishing Ltd
KW  - Cosmic strings
KW  - domain walls
KW  - monopoles
KW  - cosmological phase transitions
KW  - cosmology of theories beyond the SM
KW  - gravitational waves / sources
AB  - We show that, when connected with monopoles, the flat D-flat direction breaking the local U(1)B-L symmetry as an extension of the minimal supersymmetric standard model can be responsible for the signal of a stochastic gravitational wave background recently reported by NANOGrav collaborations, while naturally satisfying constraints at high frequency band. Thanks to the flatness of the direction, a phase of thermal inflation arises naturally. The reheating temperature is quite low, and suppresses signals at frequencies higher than the characteristic frequency set by the reheating temperature. Notably, forthcoming spaced based experiments such as LISA can probe the cutoff frequency, providing an indirect clue of the scale of soft SUSY-breaking mass parameter.
SN  - 1475-7516
UR  - https://arxiv.org/abs/2308.11439
UR  - https://doi.org/10.1088/1475-7516/2024/01/015
DO  - 10.1088/1475-7516/2024/01/015
LA  - English
N1  - WOS:001147733000001
ID  - Maji+Park2024
ER  -