Imprint of inflationary gravitational waves and WIMP dark matter in pulsar timing array data

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F24%3A00585265" target="_blank" >RIV/68378271:_____/24:00585265 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1088/1475-7516/2024/03/031" target="_blank" >https://doi.org/10.1088/1475-7516/2024/03/031</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1475-7516/2024/03/031" target="_blank" >10.1088/1475-7516/2024/03/031</a>

Result language
angličtina
Original language name
Imprint of inflationary gravitational waves and WIMP dark matter in pulsar timing array data
Original language description
Motivated by the recent release of new results from five different pulsar timing array (PTA) experiments claiming to have found compelling evidence for primordial gravitational waves (GW) at nanoHz frequencies, we consider the prospects of generating such a signal from inflationary bluetilted tensor power spectrum in a specific dark matter (DM) scenario dubbed as Miracleless WIMP. While Miracleless WIMP, due to insufficient interaction rate with the Standard Model (SM) bath gets thermally overproduced, inflationary bluetilted gravitational waves (BGW) in compliance with PTA data, conflict cosmological observations if reheat temperature after inflation is sufficiently high. Both these issues are circumvented with late entropy dilution, bringing DM abundance within observational limits and creating a doublypeaked feature in the BGW spectrum consistent with cosmological observations. The bluetilted tail of the lowfrequency peak can fit NANOGrav 15 yr data, while other parts of the spectrum are within reach of present and future GW experiments.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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