TY - RPRT TI - String theory and grand unification suggest a submicroelectronvolt QCD axion AU - Benabou, Joshua N. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)] (ORCID:0000000162313764) AU - Fraser, Katherine [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)] (ORCID:0000000337238517) AU - Reig, Mario [University of Oxford (United Kingdom)] (ORCID:0000000168155605) AU - Safdi, Benjamin R. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)] (ORCID:0000000195311319) PY - 2025 DO - 10.1103/lthr-97lm UR - https://www.osti.gov/biblio/3014751 ID - 3014751 ER -