Formation and decay of oscillons after inflation in the presence of an external coupling, Part-I: Lattice simulations
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866916269161185280 |
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| author | Shafi, Mohammed Copeland, Edmund J. Mahbub, Rafid Mishra, Swagat S. Basak, Soumen |
| author_facet | Shafi, Mohammed Copeland, Edmund J. Mahbub, Rafid Mishra, Swagat S. Basak, Soumen |
| contents | We investigate the formation and decay of oscillons during the post-inflationary reheating epoch from inflaton oscillations around asymptotically flat potentials $V(φ)$ in the presence of an external coupling of the form $\frac{1}{2}\, g^2 \, φ^2 \, χ^2$. It is well-known that in the absence of such an external coupling, the attractive self-interaction term in the potential leads to the formation of copious amounts of long-lived oscillons both for symmetric and asymmetric plateau potentials. We perform a detailed numerical analysis to study the formation of oscillons in the $α$-attractor E- and T-model potentials using the publicly available lattice simulation code ${\cal C}$osmo${\cal L}$attice. We observe the formation of nonlinear oscillon-like structures with the average equation of state $\langle w_φ\rangle \simeq 0$ for a range of values of the inflaton self-coupling $λ$ and the external coupling $g^2$. Our results demonstrate that oscillons form even in the presence of an external coupling and we determine the upper bound on $g^2$ which facilitates oscillon formation. We also find that eventually, these oscillons decay into the scalar inflaton radiation as well as into the quanta of the offspring field $χ$. Thus, we establish the possibility that reheating could have proceeded through the channel of oscillon decay, along with the usual decay of the oscillating inflaton condensate into $χ$ particles. For a given value of the self-coupling $λ$, we notice that the lifetime of a population of oscillons decreases with an increase in the strength of the external coupling, following an (approximately) inverse power-law dependence on $g^2$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2406_00108 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Formation and decay of oscillons after inflation in the presence of an external coupling, Part-I: Lattice simulations Shafi, Mohammed Copeland, Edmund J. Mahbub, Rafid Mishra, Swagat S. Basak, Soumen High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Theory We investigate the formation and decay of oscillons during the post-inflationary reheating epoch from inflaton oscillations around asymptotically flat potentials $V(φ)$ in the presence of an external coupling of the form $\frac{1}{2}\, g^2 \, φ^2 \, χ^2$. It is well-known that in the absence of such an external coupling, the attractive self-interaction term in the potential leads to the formation of copious amounts of long-lived oscillons both for symmetric and asymmetric plateau potentials. We perform a detailed numerical analysis to study the formation of oscillons in the $α$-attractor E- and T-model potentials using the publicly available lattice simulation code ${\cal C}$osmo${\cal L}$attice. We observe the formation of nonlinear oscillon-like structures with the average equation of state $\langle w_φ\rangle \simeq 0$ for a range of values of the inflaton self-coupling $λ$ and the external coupling $g^2$. Our results demonstrate that oscillons form even in the presence of an external coupling and we determine the upper bound on $g^2$ which facilitates oscillon formation. We also find that eventually, these oscillons decay into the scalar inflaton radiation as well as into the quanta of the offspring field $χ$. Thus, we establish the possibility that reheating could have proceeded through the channel of oscillon decay, along with the usual decay of the oscillating inflaton condensate into $χ$ particles. For a given value of the self-coupling $λ$, we notice that the lifetime of a population of oscillons decreases with an increase in the strength of the external coupling, following an (approximately) inverse power-law dependence on $g^2$. |
| title | Formation and decay of oscillons after inflation in the presence of an external coupling, Part-I: Lattice simulations |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2406.00108 |