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| Format: | Preprint |
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2024
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| Accès en ligne: | https://arxiv.org/abs/2410.11801 |
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| _version_ | 1866916850509545472 |
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| author | Moretti, Tommaso Bartolo, Nicola Greco, Alessandro |
| author_facet | Moretti, Tommaso Bartolo, Nicola Greco, Alessandro |
| contents | Recently, possible hints of parity violation have been observed in the connected galaxy four-point correlation function. Although the true origin of the signal from the analysis has been debated, should they have a physical origin, they might point to primordial non-Gaussianity and would be evidence of new physics.
In this work, we examine the single-field slow-roll model of inflation within chiral scalar-tensor theories of modified gravity. These theories, treated here as new Lorentz-breaking theories, extend the Chern-Simons one by including parity-violating operators containing first and second derivatives of the non-minimally coupled scalar (inflaton) field. This model is capable of imprinting parity-violating signatures in late-time observables, such as the galaxy four-point correlation function. We perform an analysis of the graviton-mediated scalar trispectrum of the gauge-invariant curvature perturbation $ζ(t,\mathbf{x})$ using one of the parity-violating operators of these theories as a case study. We estimate that for a set of parameters of the theory it is possible to produce a signal-to-noise ratio for the parity-violating part of the trispectrum of order one without introducing modifications to the single-field slow-roll setup. Even if the signal found in the analysis turns out to be spurious or if no parity violation is ever detected in the galaxy four-point correlation function, our analysis can be used to constrain the free parameters of these theories. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_11801 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Breaking parity: the case of the trispectrum from chiral scalar-tensor theories of gravity Moretti, Tommaso Bartolo, Nicola Greco, Alessandro Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Theory Recently, possible hints of parity violation have been observed in the connected galaxy four-point correlation function. Although the true origin of the signal from the analysis has been debated, should they have a physical origin, they might point to primordial non-Gaussianity and would be evidence of new physics. In this work, we examine the single-field slow-roll model of inflation within chiral scalar-tensor theories of modified gravity. These theories, treated here as new Lorentz-breaking theories, extend the Chern-Simons one by including parity-violating operators containing first and second derivatives of the non-minimally coupled scalar (inflaton) field. This model is capable of imprinting parity-violating signatures in late-time observables, such as the galaxy four-point correlation function. We perform an analysis of the graviton-mediated scalar trispectrum of the gauge-invariant curvature perturbation $ζ(t,\mathbf{x})$ using one of the parity-violating operators of these theories as a case study. We estimate that for a set of parameters of the theory it is possible to produce a signal-to-noise ratio for the parity-violating part of the trispectrum of order one without introducing modifications to the single-field slow-roll setup. Even if the signal found in the analysis turns out to be spurious or if no parity violation is ever detected in the galaxy four-point correlation function, our analysis can be used to constrain the free parameters of these theories. |
| title | Breaking parity: the case of the trispectrum from chiral scalar-tensor theories of gravity |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2410.11801 |