2-2-holes simplified
Quadratic gravity illustrates how a replacement for black holes can emerge from a UV completion of gravity. 2-2-holes are extremely compact horizonless objects with an entropy S22 due to trapped normal matter, and in this way they are conceptually easy to understand. But the field equations are cumb...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-07-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269322002763 |
| _version_ | 1811254906094354432 |
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| author | Bob Holdom |
| author_facet | Bob Holdom |
| author_sort | Bob Holdom |
| collection | DOAJ |
| description | Quadratic gravity illustrates how a replacement for black holes can emerge from a UV completion of gravity. 2-2-holes are extremely compact horizonless objects with an entropy S22 due to trapped normal matter, and in this way they are conceptually easy to understand. But the field equations are cumbersome and the numerical analysis has so far been restricted to relatively small size solutions. Here we show how the properties of arbitrarily large 2-2-holes can be found, including the time delay for gravitational wave echoes and the result T∞S22=M/2. The starting point is to formulate the metric in terms of the tortoise coordinate, and to have one of the two metric functions be a conformal factor. A large conformally-related volume becomes associated with the interior of a 2-2-hole. We also discuss implications for the weak gravity conjecture. |
| first_indexed | 2024-04-12T17:15:37Z |
| format | Article |
| id | doaj.art-1db7d9df266d4de2a69c3c006ab99094 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-04-12T17:15:37Z |
| publishDate | 2022-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-1db7d9df266d4de2a69c3c006ab990942022-12-22T03:23:39ZengElsevierPhysics Letters B0370-26932022-07-018301371422-2-holes simplifiedBob Holdom0Department of Physics, University of Toronto, Toronto, Ontario, M5S 1A7, CanadaQuadratic gravity illustrates how a replacement for black holes can emerge from a UV completion of gravity. 2-2-holes are extremely compact horizonless objects with an entropy S22 due to trapped normal matter, and in this way they are conceptually easy to understand. But the field equations are cumbersome and the numerical analysis has so far been restricted to relatively small size solutions. Here we show how the properties of arbitrarily large 2-2-holes can be found, including the time delay for gravitational wave echoes and the result T∞S22=M/2. The starting point is to formulate the metric in terms of the tortoise coordinate, and to have one of the two metric functions be a conformal factor. A large conformally-related volume becomes associated with the interior of a 2-2-hole. We also discuss implications for the weak gravity conjecture.http://www.sciencedirect.com/science/article/pii/S0370269322002763 |
| spellingShingle | Bob Holdom 2-2-holes simplified Physics Letters B |
| title | 2-2-holes simplified |
| title_full | 2-2-holes simplified |
| title_fullStr | 2-2-holes simplified |
| title_full_unstemmed | 2-2-holes simplified |
| title_short | 2-2-holes simplified |
| title_sort | 2 2 holes simplified |
| url | http://www.sciencedirect.com/science/article/pii/S0370269322002763 |
| work_keys_str_mv | AT bobholdom 22holessimplified |