MG13 - Talk detail |
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Participant |
Youssef, Ahmed | |||||||
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Institution |
Humboldt university - Newton Strasse 15 - Berlin - Berlin - Germany | |||||||
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Session |
QG3 |
Accepted |
Yes |
Order |
9 |
Time |
17:50 - 18:10 | 15' + 5' |
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Talk |
Oral abstract |
Title |
Infrared Behavior and Gauge Artifacts in de Sitter Spacetime: The Photon Field | |||||
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Abstract |
We study the infrared (long-distance) behavior of the free photon field in de Sitter spacetime. Using a two-parameter family of gauge-fixing terms, we show that the infrared (IR) behavior of the two-point function is highly gauge-dependent and ranges from vanishing to growing. This situation is in disagreement with its counterpart in flat spacetime, where the two-point function vanishes in the IR region for any choice of the gauge-fixing parameters. A criterion to isolate the physical part of the two-point function is given and is shown to lead to a well-behaved two-point function in the IR region. |
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