Angular momentum of zero-frequency gravitons
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arXiv
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| Format: | Preprint |
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2022
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| _version_ | 1866910499109601280 |
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| author | Di Vecchia, Paolo Heissenberg, Carlo Russo, Rodolfo |
| author_facet | Di Vecchia, Paolo Heissenberg, Carlo Russo, Rodolfo |
| contents | By following closely Weinberg's soft theorem, which captures the $1/ω$ pole contribution to the amplitude for soft graviton emissions ($ω<Λ$) on top of an arbitrary background hard process, we calculate the expectation value of the graviton's angular momentum operator for arbitrary collisions dressed with soft radiation. We find that the result becomes independent of the cutoff $Λ$ on the graviton's frequency, effectively localizing at $ω=0$. In this way, our result captures the contribution to the angular momentum that comes from the zero-frequency modes. Like the soft theorem, our formula has an exact dependence on the kinematics of the hard particles and is only a function of their momenta. As an example, we discuss in some detail the case of the $2 \to 2$ scattering of spinless particles in General Relativity and ${\cal N}=8$ supergravity. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2203_11915 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Angular momentum of zero-frequency gravitons Di Vecchia, Paolo Heissenberg, Carlo Russo, Rodolfo High Energy Physics - Theory General Relativity and Quantum Cosmology By following closely Weinberg's soft theorem, which captures the $1/ω$ pole contribution to the amplitude for soft graviton emissions ($ω<Λ$) on top of an arbitrary background hard process, we calculate the expectation value of the graviton's angular momentum operator for arbitrary collisions dressed with soft radiation. We find that the result becomes independent of the cutoff $Λ$ on the graviton's frequency, effectively localizing at $ω=0$. In this way, our result captures the contribution to the angular momentum that comes from the zero-frequency modes. Like the soft theorem, our formula has an exact dependence on the kinematics of the hard particles and is only a function of their momenta. As an example, we discuss in some detail the case of the $2 \to 2$ scattering of spinless particles in General Relativity and ${\cal N}=8$ supergravity. |
| title | Angular momentum of zero-frequency gravitons |
| topic | High Energy Physics - Theory General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2203.11915 |