Probing the speed of scalar induced gravitational waves from observations
Abstract The propagation speed of gravitational waves is a fundamental issue in gravitational theory. According to general relativity, gravitational waves propagate at the speed of light. However, alternative theories of gravity propose modifications to general relativity, including variations in th...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2024-10-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-024-13448-4 |
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| _version_ | 1849220604932128768 |
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| author | Jun Li Guang-Hai Guo Yongcan Zu |
| author_facet | Jun Li Guang-Hai Guo Yongcan Zu |
| author_sort | Jun Li |
| collection | DOAJ |
| description | Abstract The propagation speed of gravitational waves is a fundamental issue in gravitational theory. According to general relativity, gravitational waves propagate at the speed of light. However, alternative theories of gravity propose modifications to general relativity, including variations in the speed of gravitational waves. In this paper, we investigate scalar-induced gravitational waves that propagate at speeds different from the speed of light. First, we analytically calculate the power spectrum of scalar induced gravitational waves based on the speed and spectrum of primordial curvature perturbations. We then explore several scalar power spectra, deriving corresponding fractional energy densities, including monochromatic spectrum, scale-invariant spectrum, and power-law spectrum. Finally, we constrain scalar-induced gravitational waves and evaluate the signatures of their speed from the combination of CMB+BAO and gravitational wave observations. Our numerical results clearly illustrate the influence of the speed of scalar-induced gravitational waves. |
| format | Article |
| id | doaj-art-d075e982062e409392d7358a349e5811 |
| institution | Kabale University |
| issn | 1434-6052 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj-art-d075e982062e409392d7358a349e58112024-12-08T12:43:01ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522024-10-01841011210.1140/epjc/s10052-024-13448-4Probing the speed of scalar induced gravitational waves from observationsJun Li0Guang-Hai Guo1Yongcan Zu2School of Mathematics and Physics, Qingdao University of Science and TechnologySchool of Mathematics and Physics, Qingdao University of Science and TechnologyKey Laboratory of Marine Science and Numerical Modeling, First Institute of Oceanography, Ministry of Natural ResourcesAbstract The propagation speed of gravitational waves is a fundamental issue in gravitational theory. According to general relativity, gravitational waves propagate at the speed of light. However, alternative theories of gravity propose modifications to general relativity, including variations in the speed of gravitational waves. In this paper, we investigate scalar-induced gravitational waves that propagate at speeds different from the speed of light. First, we analytically calculate the power spectrum of scalar induced gravitational waves based on the speed and spectrum of primordial curvature perturbations. We then explore several scalar power spectra, deriving corresponding fractional energy densities, including monochromatic spectrum, scale-invariant spectrum, and power-law spectrum. Finally, we constrain scalar-induced gravitational waves and evaluate the signatures of their speed from the combination of CMB+BAO and gravitational wave observations. Our numerical results clearly illustrate the influence of the speed of scalar-induced gravitational waves.https://doi.org/10.1140/epjc/s10052-024-13448-4 |
| spellingShingle | Jun Li Guang-Hai Guo Yongcan Zu Probing the speed of scalar induced gravitational waves from observations European Physical Journal C: Particles and Fields |
| title | Probing the speed of scalar induced gravitational waves from observations |
| title_full | Probing the speed of scalar induced gravitational waves from observations |
| title_fullStr | Probing the speed of scalar induced gravitational waves from observations |
| title_full_unstemmed | Probing the speed of scalar induced gravitational waves from observations |
| title_short | Probing the speed of scalar induced gravitational waves from observations |
| title_sort | probing the speed of scalar induced gravitational waves from observations |
| url | https://doi.org/10.1140/epjc/s10052-024-13448-4 |
| work_keys_str_mv | AT junli probingthespeedofscalarinducedgravitationalwavesfromobservations AT guanghaiguo probingthespeedofscalarinducedgravitationalwavesfromobservations AT yongcanzu probingthespeedofscalarinducedgravitationalwavesfromobservations |