Photon–Photon Interactions and the Opacity of the Universe in Gamma Rays
We discuss the topic of the transparency of the Universe in gamma rays due to extragalactic background light, and its cosmological and physical implications. Rather than a review, this is a personal account on the development of 30 years of this branch of physical science. Extensive analysis of the...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-05-01
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| Series: | Universe |
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| Online Access: | https://www.mdpi.com/2218-1997/7/5/146 |
| _version_ | 1797534140861513728 |
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| author | Alberto Franceschini |
| author_facet | Alberto Franceschini |
| author_sort | Alberto Franceschini |
| collection | DOAJ |
| description | We discuss the topic of the transparency of the Universe in gamma rays due to extragalactic background light, and its cosmological and physical implications. Rather than a review, this is a personal account on the development of 30 years of this branch of physical science. Extensive analysis of the currently available information appears to us as revealing a global coherence among the astrophysical, cosmological, and fundamental physics data, or, at least, no evident need so far of substantial modification of our present understanding. Deeper data from future experiments will verify to what extent and in which directions this conclusion should be modified. |
| first_indexed | 2024-03-10T11:25:25Z |
| format | Article |
| id | doaj.art-fc49aa101e9846d397050abcc7c81329 |
| institution | Directory Open Access Journal |
| issn | 2218-1997 |
| language | English |
| last_indexed | 2024-03-10T11:25:25Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Universe |
| spelling | doaj.art-fc49aa101e9846d397050abcc7c813292023-11-21T19:44:05ZengMDPI AGUniverse2218-19972021-05-017514610.3390/universe7050146Photon–Photon Interactions and the Opacity of the Universe in Gamma RaysAlberto Franceschini0Department of Physics and Astronomy, University of Padova, I-35122 Padova, ItalyWe discuss the topic of the transparency of the Universe in gamma rays due to extragalactic background light, and its cosmological and physical implications. Rather than a review, this is a personal account on the development of 30 years of this branch of physical science. Extensive analysis of the currently available information appears to us as revealing a global coherence among the astrophysical, cosmological, and fundamental physics data, or, at least, no evident need so far of substantial modification of our present understanding. Deeper data from future experiments will verify to what extent and in which directions this conclusion should be modified.https://www.mdpi.com/2218-1997/7/5/146high energy astrophysicsbackground radiationphoton–photon interactionpair production |
| spellingShingle | Alberto Franceschini Photon–Photon Interactions and the Opacity of the Universe in Gamma Rays Universe high energy astrophysics background radiation photon–photon interaction pair production |
| title | Photon–Photon Interactions and the Opacity of the Universe in Gamma Rays |
| title_full | Photon–Photon Interactions and the Opacity of the Universe in Gamma Rays |
| title_fullStr | Photon–Photon Interactions and the Opacity of the Universe in Gamma Rays |
| title_full_unstemmed | Photon–Photon Interactions and the Opacity of the Universe in Gamma Rays |
| title_short | Photon–Photon Interactions and the Opacity of the Universe in Gamma Rays |
| title_sort | photon photon interactions and the opacity of the universe in gamma rays |
| topic | high energy astrophysics background radiation photon–photon interaction pair production |
| url | https://www.mdpi.com/2218-1997/7/5/146 |
| work_keys_str_mv | AT albertofranceschini photonphotoninteractionsandtheopacityoftheuniverseingammarays |