Non-unitary evolution in the general extended EFT of inflation & excited initial states

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dc.identifier.uri http://dx.doi.org/10.15488/4886
dc.identifier.uri https://www.repo.uni-hannover.de/handle/123456789/4929
dc.contributor.author Ashoorioon, Amjad
dc.date.accessioned 2019-05-29T07:03:13Z
dc.date.available 2019-05-29T07:03:13Z
dc.date.issued 2018
dc.identifier.citation Ashoorioon, A.: Non-unitary evolution in the general extended EFT of inflation & excited initial states. In: Journal of High Energy Physics (2018), Nr. 12, 12. DOI: https://doi.org/10.1007/JHEP12(2018)012
dc.description.abstract I study the general case that arises in the Extended Effective Field Theory of Inflation (gEEFToI), in which the coefficients of the sixth order polynomial dispersion relation depend on the physical wavelength of the fluctuation mode, hence they are time-dependent. At arbitrarily short wavelengths the unitarity is lost for each mode. Depending on the values of the gEEFToI parameters in the unitary gauge action, two scenarios can arise: in one, the coefficients of the polynomial become singular, flip signs at some physical wavelength and asymptote to a constant value as the wavelength of the mode is stretched to infinity. Starting from the WKB vacuum, the two-point function is essentially singular in the infinite IR limit. In the other case, the coefficients of the dispersion relation evolve monotonically from zero to a constant value in the infinite IR. In order to have a finite power spectrum starting from the vacuum in this case, the mode function has to be an eigensolution of the Confluent Heun (CH) equation, which leads to a very confined parameter space for gEEFToI. Finally, I look at a solution of the CH equation which is regular in the infinite IR limit and yields a finite power spectrum in either scenario. I demonstrate that this solution asymptotes to an excited state in past infinity in both cases. The result is interpreted in the light of the loss of unitarity for very small wavelengths. The outcome of such a non-unitary phase evolution should prepare each mode in the excited initial state that yields a finite two-point function for all the parameter space. This will be constraining of the new physics that UV completes such scenarios. eng
dc.language.iso eng
dc.publisher Berlin : Springer
dc.relation.ispartofseries Journal of High Energy Physics (2018), Nr. 12
dc.rights CC BY 4.0 Unported
dc.rights.uri https://creativecommons.org/licenses/by/4.0/deed.en
dc.subject Cosmology of Theories beyond the SM eng
dc.subject Effective Field Theories eng
dc.subject.ddc 530 | Physik ger
dc.title Non-unitary evolution in the general extended EFT of inflation & excited initial states
dc.type article
dc.type Text
dc.relation.essn 1029-8479
dc.relation.issn 1126-6708
dc.relation.doi https://doi.org/10.1007/JHEP12(2018)012
dc.bibliographicCitation.issue 12
dc.bibliographicCitation.firstPage 12
dc.description.version publishedVersion
tib.accessRights frei zug�nglich


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