Vacuum, ma non troppo: hidden matter distribution in symmetry-transformed electrovacuum spacetimes
Fuente:
arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866917509714673664 |
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| author | Herdeiro, Carlos A. R. Novo, João P. A. |
| author_facet | Herdeiro, Carlos A. R. Novo, João P. A. |
| contents | We analyse two static spacetimes, recently generated from a Schwarzschild--Bertotti--Robinson electrovacuum seed through distinct symmetry transformations. The electromagnetic field of the transformed solutions can be set to zero and both solutions were presented as vacuum solutions of General Relativity. However, we show that once recast in Weyl form, both metrics are seen to be supported by a semi-infinite annular mass distribution on the equatorial plane. Thus, these metrics harbour a hidden matter source, visible in Weyl coordinates. In the original Schwarzschild-like coordinates equatorial null geodesics reach spatial infinity ($r\to\infty$) in finite affine parameter. In the Weyl representation, these geodesics approach the inner edge of the annulus, where the coordinate map degenerates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_18967 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Vacuum, ma non troppo: hidden matter distribution in symmetry-transformed electrovacuum spacetimes Herdeiro, Carlos A. R. Novo, João P. A. General Relativity and Quantum Cosmology High Energy Physics - Theory We analyse two static spacetimes, recently generated from a Schwarzschild--Bertotti--Robinson electrovacuum seed through distinct symmetry transformations. The electromagnetic field of the transformed solutions can be set to zero and both solutions were presented as vacuum solutions of General Relativity. However, we show that once recast in Weyl form, both metrics are seen to be supported by a semi-infinite annular mass distribution on the equatorial plane. Thus, these metrics harbour a hidden matter source, visible in Weyl coordinates. In the original Schwarzschild-like coordinates equatorial null geodesics reach spatial infinity ($r\to\infty$) in finite affine parameter. In the Weyl representation, these geodesics approach the inner edge of the annulus, where the coordinate map degenerates. |
| title | Vacuum, ma non troppo: hidden matter distribution in symmetry-transformed electrovacuum spacetimes |
| topic | General Relativity and Quantum Cosmology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2605.18967 |