Cosmic superstrings, metastable strings and ultralight primordial black holes: from NANOGrav to LIGO and beyond

A bstract While topologically stable cosmic strings are disfavoured by the recent observation of nHz stochastic gravitational waves (GW) by Pulsar Timing Arrays (PTA), e.g., NANOGrav, cosmic metastable strings and superstrings are not. However, because the gravitational waves from all classes of str...

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Vydáno v:The journal of high energy physics Ročník 2025; číslo 2; s. 95 - 35
Hlavní autoři: Datta, Satyabrata, Samanta, Rome
Médium: Journal Article
Jazyk:angličtina
Vydáno: Berlin/Heidelberg Springer Berlin Heidelberg 14.02.2025
Springer Nature B.V
SpringerOpen
Témata:
Baryo-and Leptogenesis
Black Holes
Classical and Quantum Gravitation
Cosmology of Theories BSM
Early Universe Particle Physics
Elementary Particles
Gravitational waves
Hawking radiation
High energy physics
LIGO (observatory)
Physics
Physics and Astronomy
Pulsars
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Regular Article - Theoretical Physics
Relativity Theory
String Theory
Universe
Cosmology of Theories BSM
Black Holes
Baryo-and Leptogenesis
Early Universe Particle Physics
ISSN:1029-8479, 1029-8479
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Shrnutí:A bstract While topologically stable cosmic strings are disfavoured by the recent observation of nHz stochastic gravitational waves (GW) by Pulsar Timing Arrays (PTA), e.g., NANOGrav, cosmic metastable strings and superstrings are not. However, because the gravitational waves from all classes of strings generally span a wide range of frequencies, they contradict LIGO’s non-observation of stochastic gravitational waves at the f ~ 25 Hz band for a substantial string-parameter space favoured by the PTA data. Suppose ultralight primordial black holes ( M BH < 10 9 g) existed in the early universe. In this case, they reduce the amplitude of the GWs at higher frequencies by providing an early matter-dominated phase, alleviating the tension between LIGO observation and PTA data. We show that the recent PTA data complemented by future LIGO-Virgo-KAGRA (LVK) runs plus detectors such as LISA and ET would be able to dapple the properties and further search strategies of such ultralight primordial black holes which are otherwise fairly elusive as they evaporate in the early universe by Hawking radiation.
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ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP02(2025)095