The sinusoidal valley: a recipe for high peaks in the scalar and induced tensor spectra
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866916690355290112 |
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| author | Katsis, Aris |
| author_facet | Katsis, Aris |
| contents | Adding a sine-type interaction to inflationary models with two fields can evoke a classical trajectory with many turns in field space. Under conditions we discuss, the enhancement of the spectrum of adiabatic fluctuations resulting from each turn adds up. A special range of scales away from the CMB-constrained region can then be enhanced by several orders of magnitude, allowing for interesting phenomenological possibilities, such as induced gravitational waves or primordial black holes. A localized version of this interaction can also be used as an add-on to conventional inflationary models, thus allowing the injection of the large peak in their power spectra. The intuition and the conclusions drawn from this simple model remain relevant for more complicated applications that usually include extra terms that obscure the simplicity of the mechanism. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_12015 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The sinusoidal valley: a recipe for high peaks in the scalar and induced tensor spectra Katsis, Aris Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory Adding a sine-type interaction to inflationary models with two fields can evoke a classical trajectory with many turns in field space. Under conditions we discuss, the enhancement of the spectrum of adiabatic fluctuations resulting from each turn adds up. A special range of scales away from the CMB-constrained region can then be enhanced by several orders of magnitude, allowing for interesting phenomenological possibilities, such as induced gravitational waves or primordial black holes. A localized version of this interaction can also be used as an add-on to conventional inflationary models, thus allowing the injection of the large peak in their power spectra. The intuition and the conclusions drawn from this simple model remain relevant for more complicated applications that usually include extra terms that obscure the simplicity of the mechanism. |
| title | The sinusoidal valley: a recipe for high peaks in the scalar and induced tensor spectra |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2502.12015 |