TY - JOUR
T1 - Constraining the cosmic strings gravitational wave spectra in no-scale inflation with viable gravitino dark matter and nonthermal leptogenesis
AU - Ahmed, Waqas
AU - Junaid, M.
AU - Nasri, Salah
AU - Zubair, Umer
N1 - Funding Information:
We thank Valerie Domcke, George K. Lenotaris, and Kazunori Kohri for valuable discussions. The work of S. N. is supported by the United Arab Emirates University under UPAR Grant No. 12S004.
Publisher Copyright:
© 2022 authors. Published by the American Physical Society.
PY - 2022/6/1
Y1 - 2022/6/1
N2 - We revisit the hybrid inflation model gauged by U(1)B-L extension of the minimal supersymmetric standard model in a no-scale background. Considering a single predictive framework, we study inflation, leptogenesis, gavitino cosmology, and the stochastic background of gravitational waves produced by metastable cosmic strings. The spontaneous breaking of U(1)B-L at the end of inflation produces a network of metastable cosmic strings, while the interaction between the U(1)B-L Higgs field and the neutrinos generate heavy Majorana masses for the right-handed neutrinos. The heavy Majorana masses explain the tiny neutrino masses via the seesaw mechanism, a realistic scenario for reheating and nonthermal leptogenesis. We show that a successful nonthermal leptogenesis and a stable gravitino as a dark matter candidate can be achieved for a wide range of reheating temperatures and U(1)B-L symmetry breaking scales. The possibility of realizing metastable cosmic strings in a grand unified theory setup is briefly discussed. We find that a successful reheating with nonthermal leptogenesis and gravitino dark matter restricts the allowed values of string tension to a narrow range 10-9GμCS8×10-6, predicting a stochastic gravitational-wave background that lies within the 1σ bounds of the recent NANOGrav 12.5-yr data, as well as within the sensitivity bounds of future GW experiments.
AB - We revisit the hybrid inflation model gauged by U(1)B-L extension of the minimal supersymmetric standard model in a no-scale background. Considering a single predictive framework, we study inflation, leptogenesis, gavitino cosmology, and the stochastic background of gravitational waves produced by metastable cosmic strings. The spontaneous breaking of U(1)B-L at the end of inflation produces a network of metastable cosmic strings, while the interaction between the U(1)B-L Higgs field and the neutrinos generate heavy Majorana masses for the right-handed neutrinos. The heavy Majorana masses explain the tiny neutrino masses via the seesaw mechanism, a realistic scenario for reheating and nonthermal leptogenesis. We show that a successful nonthermal leptogenesis and a stable gravitino as a dark matter candidate can be achieved for a wide range of reheating temperatures and U(1)B-L symmetry breaking scales. The possibility of realizing metastable cosmic strings in a grand unified theory setup is briefly discussed. We find that a successful reheating with nonthermal leptogenesis and gravitino dark matter restricts the allowed values of string tension to a narrow range 10-9GμCS8×10-6, predicting a stochastic gravitational-wave background that lies within the 1σ bounds of the recent NANOGrav 12.5-yr data, as well as within the sensitivity bounds of future GW experiments.
UR - http://www.scopus.com/inward/record.url?scp=85132350310&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85132350310&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.105.115008
DO - 10.1103/PhysRevD.105.115008
M3 - Article
AN - SCOPUS:85132350310
SN - 2470-0010
VL - 105
JO - Physical Review D
JF - Physical Review D
IS - 11
M1 - 115008
ER -