Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/4707
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dc.contributor.authorLochan, Kinjalk-
dc.date.accessioned2023-08-16T06:23:18Z-
dc.date.available2023-08-16T06:23:18Z-
dc.date.issued2021-
dc.identifier.citationJournal of High Energy Physics, (3).en_US
dc.identifier.urihttps://doi.org/10.1007/JHEP03(2021)220-
dc.identifier.urihttp://hdl.handle.net/123456789/4707-
dc.descriptionOnly IISERM authors are available in the recorden_US
dc.description.abstractWe derive the response function for a comoving, pointlike Unruh-DeWitt particle detector coupled to a complex scalar field ϕ, in the (3 + 1)-dimensional cosmological de Sitter spacetime. The field-detector coupling is taken to be proportional to ϕ†ϕ. We address both conformally invariant and massless minimally coupled scalar field theories, respectively in the conformal and the Bunch-Davies vacuum. The response function integral for the massless minimal complex scalar, not surprisingly, shows divergences and accordingly we use suitable regularisation scheme to find out well behaved results. The regularised result also contains a de Sitter symmetry breaking logarithm, growing with the cosmological time. Possibility of extension of these results with the so called de Sitter α-vacua is discussed. While we find no apparent problem in computing the response function for a real scalar in these vacua, a complex scalar field is shown to contain some possible ambiguities in the detector response. The case of the minimal and nearly massless scalar field theory is also briefly discussed.en_US
dc.language.isoen_USen_US
dc.subjectRenormalization Regularization and Renormalonsen_US
dc.subjectNonperturbative Effectsen_US
dc.titleUnruh-DeWitt detector responses for complex scalar fields in de Sitter spacetimeen_US
dc.typeArticleen_US
Appears in Collections:Research Articles

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