Probing Spacetime Foam with Extragalactic Sources of High-Energy Photons
Quantum fluctuations can endow spacetime with a foamy structure. In this review article, we discuss our various proposals to observationally constrain models of spacetime foam. One way is to examine if the light wave-front from a distant quasar or GRB can be noticeably distorted by spacetime-foam-in...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-07-01
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| Series: | Universe |
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| Online Access: | https://www.mdpi.com/2218-1997/8/7/382 |
| _version_ | 1797415239113768960 |
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| author | Y. Jack Ng Eric S. Perlman |
| author_facet | Y. Jack Ng Eric S. Perlman |
| author_sort | Y. Jack Ng |
| collection | DOAJ |
| description | Quantum fluctuations can endow spacetime with a foamy structure. In this review article, we discuss our various proposals to observationally constrain models of spacetime foam. One way is to examine if the light wave-front from a distant quasar or GRB can be noticeably distorted by spacetime-foam-induced phase incoherence. As the phase fluctuations are proportional to the distance to the source but inversely proportional to the wavelength, ultra-high energy photons (>1 TeV) from distant sources are particularly useful. We elaborate on several proposals, including the possibility of detecting spacetime foam by observing “seeing disks” in the images of distant quasars and active galactic nuclei. We also discuss the appropriate distance measure for calculating the expected angular broadening. In addition, we discuss our more recent work in which we investigate whether wave-front distortions on small scales (due to spacetime foam) can cause distant objects become undetectable because the phase fluctuations have accumulated to the point at which image formation is impossible. Another possibility that has recently become accessible is to use interferometers to observe cosmologically distant sources, thereby giving a large baseline perpendicular to the local wave vector over which the wave front could become corrugated and thus distorted, reducing or eliminating its fringe visibility. We argue that all these methods ultimately depend on the availability of ways (if any) to carry out proper averaging of contributions from different light paths from the source to the telescope. |
| first_indexed | 2024-03-09T05:44:57Z |
| format | Article |
| id | doaj.art-42c316c76464405e8aa9645c158f80b0 |
| institution | Directory Open Access Journal |
| issn | 2218-1997 |
| language | English |
| last_indexed | 2024-03-09T05:44:57Z |
| publishDate | 2022-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Universe |
| spelling | doaj.art-42c316c76464405e8aa9645c158f80b02023-12-03T12:21:53ZengMDPI AGUniverse2218-19972022-07-018738210.3390/universe8070382Probing Spacetime Foam with Extragalactic Sources of High-Energy PhotonsY. Jack Ng0Eric S. Perlman1Department of Physics & Astronomy, University of North Carolina, Chapel Hill, NC 27599, USADepartment of Aerospace, Physics and Space Sciences, Florida Institute of Technology, Melbourne, FL 32901, USAQuantum fluctuations can endow spacetime with a foamy structure. In this review article, we discuss our various proposals to observationally constrain models of spacetime foam. One way is to examine if the light wave-front from a distant quasar or GRB can be noticeably distorted by spacetime-foam-induced phase incoherence. As the phase fluctuations are proportional to the distance to the source but inversely proportional to the wavelength, ultra-high energy photons (>1 TeV) from distant sources are particularly useful. We elaborate on several proposals, including the possibility of detecting spacetime foam by observing “seeing disks” in the images of distant quasars and active galactic nuclei. We also discuss the appropriate distance measure for calculating the expected angular broadening. In addition, we discuss our more recent work in which we investigate whether wave-front distortions on small scales (due to spacetime foam) can cause distant objects become undetectable because the phase fluctuations have accumulated to the point at which image formation is impossible. Another possibility that has recently become accessible is to use interferometers to observe cosmologically distant sources, thereby giving a large baseline perpendicular to the local wave vector over which the wave front could become corrugated and thus distorted, reducing or eliminating its fringe visibility. We argue that all these methods ultimately depend on the availability of ways (if any) to carry out proper averaging of contributions from different light paths from the source to the telescope.https://www.mdpi.com/2218-1997/8/7/382spacetime foamquantum fluctuationsholographic principleultra-high energy photonsquasarsinterferometry |
| spellingShingle | Y. Jack Ng Eric S. Perlman Probing Spacetime Foam with Extragalactic Sources of High-Energy Photons Universe spacetime foam quantum fluctuations holographic principle ultra-high energy photons quasars interferometry |
| title | Probing Spacetime Foam with Extragalactic Sources of High-Energy Photons |
| title_full | Probing Spacetime Foam with Extragalactic Sources of High-Energy Photons |
| title_fullStr | Probing Spacetime Foam with Extragalactic Sources of High-Energy Photons |
| title_full_unstemmed | Probing Spacetime Foam with Extragalactic Sources of High-Energy Photons |
| title_short | Probing Spacetime Foam with Extragalactic Sources of High-Energy Photons |
| title_sort | probing spacetime foam with extragalactic sources of high energy photons |
| topic | spacetime foam quantum fluctuations holographic principle ultra-high energy photons quasars interferometry |
| url | https://www.mdpi.com/2218-1997/8/7/382 |
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