NANOGrav spectral index γ=3 from melting domain walls
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F23%3A00581915" target="_blank" >RIV/68378271:_____/23:00581915 - isvavai.cz</a>
Result on the web
<a href="https://hdl.handle.net/11104/0350066" target="_blank" >https://hdl.handle.net/11104/0350066</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevD.108.123529" target="_blank" >10.1103/PhysRevD.108.123529</a>
Alternative languages
Result language
angličtina
Original language name
NANOGrav spectral index γ=3 from melting domain walls
Original language description
We discuss cosmic domain walls described by a tension red-shifting with the expansion of the Universe. These melting domain walls emit gravitational waves with the low-frequency spectral shape $Omega_{gw}propto f^{2}$ corresponding to the spectral index $gamma=3$ favoured by the recent NANOGrav 15 yrs data. We discuss a concrete high-energy physics scenario leading to such a melting domain wall network in the early Universe. This scenario involves a feebly coupled scalar field, which can serve as a promising dark matter candidate. We identify parameters of the model matching the gravitational wave characteristics observed in the NANOGrav data. The dark matter mass is pushed to the ultra-light range below $10^{-11}-10^{-12}, ext{eV}$ which is accessible through planned observations thanks to the effects of superradiance of rotating black holes.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10303 - Particles and field physics
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review D
ISSN
2470-0010
e-ISSN
2470-0029
Volume of the periodical
108
Issue of the periodical within the volume
12
Country of publishing house
US - UNITED STATES
Number of pages
7
Pages from-to
123529
UT code for WoS article
001145885800004
EID of the result in the Scopus database
2-s2.0-85180316775