Lattice simulations of axion-U(1) inflation: gravitational waves, magnetic fields, and scalar statistics
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F25%3A00636833" target="_blank" >RIV/68378271:_____/25:00636833 - isvavai.cz</a>
Result on the web
<a href="https://hdl.handle.net/11104/0374425" target="_blank" >https://hdl.handle.net/11104/0374425</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1475-7516/2025/05/079" target="_blank" >10.1088/1475-7516/2025/05/079</a>
Alternative languages
Result language
angličtina
Original language name
Lattice simulations of axion-U(1) inflation: gravitational waves, magnetic fields, and scalar statistics
Original language description
We numerically study axion-U(1) inflation, focusing on the regime where the coupling between axions and gauge fields results in significant backreaction from the amplified gauge fields during inflation. These amplified gauge fields not only generate high-frequency gravitational waves (GWs), but also enhance spatial inhomogeneities in the axion field. GWs serve as key probe for constraining the coupling strength between the axion and gauge fields. We find that, when backreaction is important during inflation, the constraints on the coupling strength due to GW overproduction are relaxed compared to previous studies, in which backreaction matters only after inflation. Moreover, our results suggest that the probability density function (PDF) of axion fluctuations tends toward a Gaussian distribution even in cases where gauge field backreaction is important only after inflation. This aligns with previous studies where the same effect was observed for cases with strong backreaction during inflation. This finding can be crucial for future studies of primordial black hole (PBH) formation, which can further constrain the coupling strength. We also calculate the spectrum of the produced magnetic fields in this model and find that their strength is compatible with the observed lower limits.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics
Result continuities
Project
<a href="/en/project/GA24-13079S" target="_blank" >GA24-13079S: The Other Side of Axions</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Cosmology and Astroparticle Physics
ISSN
1475-7516
e-ISSN
1475-7516
Volume of the periodical
2025
Issue of the periodical within the volume
5
Country of publishing house
US - UNITED STATES
Number of pages
37
Pages from-to
079
UT code for WoS article
001502086500005
EID of the result in the Scopus database
2-s2.0-105005857873