ICTS:30706

Probing Axion-U(1) Inflation: Gravitational Waves and Primordial Black Hole Formation

APA

(2025). Probing Axion-U(1) Inflation: Gravitational Waves and Primordial Black Hole Formation. SciVideos. https://youtube.com/live/RtctKCTreoE

MLA

Probing Axion-U(1) Inflation: Gravitational Waves and Primordial Black Hole Formation. SciVideos, Jan. 07, 2025, https://youtube.com/live/RtctKCTreoE

BibTex

          @misc{ scivideos_ICTS:30706,
            doi = {},
            url = {https://youtube.com/live/RtctKCTreoE},
            author = {},
            keywords = {},
            language = {en},
            title = {Probing Axion-U(1) Inflation: Gravitational Waves and Primordial Black Hole Formation},
            publisher = {},
            year = {2025},
            month = {jan},
            note = {ICTS:30706 see, \url{https://scivideos.org/index.php/icts-tifr/30706}}
          }
          
Ramkishor Sharma
Talk numberICTS:30706

Abstract

Axion inflation models are particularly interesting due to their shift symmetry, which protects the axion potential from large quantum corrections. In models where the axion couples to a gauge field, this coupling gives rise to a rich phenomenology, including the production of gravitational waves (GWs), primordial black holes, and primordial magnetic fields. In this talk, I will discuss our ongoing work that numerically explores axion inflation in the regime where a strong coupling between axions and gauge fields induces significant backreaction from amplified gauge fields during inflation. These amplified fields produce high-frequency GWs, which serve as a probe for constraining the coupling strength between axions and gauge fields. Our findings indicate that when backreaction is significant during inflation, constraints on coupling strength due to GW overproduction are relaxed compared to previous studies where backreaction occurs only after inflation. I will also discuss the generation of magnetic fields of astrophysical interest in this model.