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dc.contributor.author | Odintsov, Sergei D. | - |
dc.contributor.author | Oikonomou, Vasilis K. | - |
dc.date.accessioned | 2022-08-16T11:30:03Z | - |
dc.date.available | 2022-08-16T11:30:03Z | - |
dc.date.issued | 2022-03-31 | - |
dc.identifier | doi: 10.1002/prop.202100167 | - |
dc.identifier | issn: 1521-3978 | - |
dc.identifier.citation | Fortschritte der Physik 70(5): 2100167 (2022) | - |
dc.identifier.uri | http://hdl.handle.net/10261/275859 | - |
dc.description.abstract | In order to describe inflation in general relativity, scalar fields must inevitably be used, with all the setbacks of that description. On the other hand, (Formula presented.) gravity and other modified gravity theories seem to provide a unified description of early and late-time dynamics without resorting to scalar or phantom theories. The question is, can modified gravity affect directly the mysterious radiation domination era? Addressing this question is the focus in this work, and we shall consider the case for which in the early stages of the radiation domination era, namely during the reheating era, the background equation of state parameter is different from (Formula presented.). As we show, in the context of (Formula presented.) gravity, an abnormal reheating era can affect the primordial gravitational wave energy spectrum today. Since future interferometers will exactly probe this era, which consists of subhorizon modes that reentered the horizon during the early stages of the radiation domination era, the focus in this work is how a short abnormal reheating era that deviates from the standard perfect fluid pattern with (Formula presented.), and generated by higher order curvature terms, can affect the primordial gravitational wave energy spectrum. Using a WKB approach, we calculate the effect of an (Formula presented.) gravity generated abnormal reheating era, and as we show the primordial gravitational wave spectrum is significantly amplified, a result which is in contrast to the general relativistic case, where the effect is minor. | - |
dc.description.sponsorship | This work was supported by MINECO (Spain), project PID2019-104397GB-I00 (S.D.O). This work by S.D.O was also partially supported by the program Unidad de Excelencia Maria de Maeztu CEX2020-001058-M, Spain. | - |
dc.language | eng | - |
dc.publisher | John Wiley & Sons | - |
dc.relation | info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-104397GB-I00/ES/MODELOS DE EVOLUCION DEL UNIVERSO Y SUS SINGULARIDADES: ASPECTOS CLASICOS Y CUANTICOS/ | - |
dc.rights | closedAccess | - |
dc.title | Amplification of Primordial Gravitational Waves by a Geometrically Driven non-canonical Reheating Era | - |
dc.type | artículo | - |
dc.identifier.doi | 10.1002/prop.202100167 | - |
dc.relation.publisherversion | http://doi.org/10.1002/prop.202100167 | - |
dc.date.updated | 2022-08-16T11:30:03Z | - |
dc.contributor.funder | Ministerio de Economía y Competitividad (España) | - |
dc.relation.csic | Sí | - |
dc.identifier.funder | http://dx.doi.org/10.13039/501100003329 | es_ES |
dc.type.coar | http://purl.org/coar/resource_type/c_6501 | es_ES |
item.grantfulltext | none | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | No Fulltext | - |
item.cerifentitytype | Publications | - |
item.openairetype | artículo | - |
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