Have pulsar timing array methods detected a cosmological phase transition?
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866911767136829440 |
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| author | Addazi, Andrea Cai, Yi-Fu Marciano, Antonino Visinelli, Luca |
| author_facet | Addazi, Andrea Cai, Yi-Fu Marciano, Antonino Visinelli, Luca |
| contents | We show that the recent detection of a gravitational wave (GW) background reported by various pulsar timing array (PTA) collaborations including NANOGrav-15yr, PPTA, EPTA, and CPTA can be explained in terms of first order phase transitions (FOPTs) from dark sector models (DSM). Specifically, we explore a model for first order phase transitions that involves the majoron, a Nambu-Goldstone boson that is emerging from the spontaneous symmetry breaking of a $U(1)_{L}$ or $U(1)_{B-L}$ symmetry. We show how the predicted GW power spectrum, with a realistic choice of the FOPT parameters, is consistent with 1-$σ$ deviations from the estimated parameters of the background detected by the PTA collaborations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_17205 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Have pulsar timing array methods detected a cosmological phase transition? Addazi, Andrea Cai, Yi-Fu Marciano, Antonino Visinelli, Luca Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena High Energy Physics - Phenomenology High Energy Physics - Theory We show that the recent detection of a gravitational wave (GW) background reported by various pulsar timing array (PTA) collaborations including NANOGrav-15yr, PPTA, EPTA, and CPTA can be explained in terms of first order phase transitions (FOPTs) from dark sector models (DSM). Specifically, we explore a model for first order phase transitions that involves the majoron, a Nambu-Goldstone boson that is emerging from the spontaneous symmetry breaking of a $U(1)_{L}$ or $U(1)_{B-L}$ symmetry. We show how the predicted GW power spectrum, with a realistic choice of the FOPT parameters, is consistent with 1-$σ$ deviations from the estimated parameters of the background detected by the PTA collaborations. |
| title | Have pulsar timing array methods detected a cosmological phase transition? |
| topic | Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2306.17205 |