Probing Helical Primordial Magnetic Fields via Chiral Gravitational Waves in the LISA-TAIJI Network
Abstract
Primordial magnetic fields (PMFs) are anticipated to be a cosmological candidate for generating a stochastic gravitational wave background (SGWB) through their anisotropic stress. In particular, if parity violation is present in the production of PMFs, it can induce a helical component in the PMFs, leading to circular polarization in the isotropic SGWB. In this study, we phenomenologically consider parity-violating inflationary magnetogenesis and compute the intensity and circular polarization of the SGWB for several assumed power spectra of helical PMFs. Using the planned sensitivity of the LISA-TAIJI network, we calculate the signal-to-noise ratio (SNR) and perform a Fisher forecast to assess the feasibility of constraining the parameters of helical PMFs. We conclude that it is possible to estimate the helical-to-non-helical power ratio~rH with SNRV>2 if the PMF strength is ℬ ≳ 10 nG (50 nG) in the case of the delta-function-type (scale-invariant-type) PMF spectrum. Our results offer a useful criterion that indicates the future observational limit on helical PMFs at the small scale kLISA ≈ 1012 Mpc−1.
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BibTeX
@misc{furusawa2026probing,
title = {{Probing Helical Primordial Magnetic Fields via Chiral Gravitational Waves in the LISA-TAIJI Network}},
author = {Kazuya Furusawa and Hiroyuki Tashiro},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.39208},
eprint = {2609.39208},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.39208},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Probing Helical Primordial Magnetic Fields via Chiral Gravitational Waves in the LISA-TAIJI Network
AU - Kazuya Furusawa
AU - Hiroyuki Tashiro
PY - 2026
DA - 2026/09/30
PB - arXiv
DO - 10.48550/arxiv.2609.39208
UR - https://arxiv.org/abs/2609.39208
AB - Primordial magnetic fields (PMFs) are anticipated to be a cosmological candidate for generating a stochastic gravitational wave background (SGWB) through their anisotropic stress. In particular, if parity violation is present in the production of PMFs, it can induce a helical component in the PMFs, leading to circular polarization in the isotropic SGWB. In this study, we phenomenologically consider parity-violating inflationary magnetogenesis and compute the intensity and circular polarization of the SGWB for several assumed power spectra of helical PMFs. Using the planned sensitivity of the LISA-TAIJI network, we calculate the signal-to-noise ratio (SNR) and perform a Fisher forecast to assess the feasibility of constraining the parameters of helical PMFs. We conclude that it is possible to estimate the helical-to-non-helical power ratio~r_H with SNR^V>2 if the PMF strength is ℬ ≳ 10 nG (50 nG) in the case of the delta-function-type (scale-invariant-type) PMF spectrum. Our results offer a useful criterion that indicates the future observational limit on helical PMFs at the small scale k_LISA ≈ 10^12 Mpc^−1.
ER -