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Did NANOGrav See a Signal from Primordial Black Hole Formation?
Ville Vaskonen1, Hardi Veermäe2
1Institut de Fisica dAltes Energies, The Barcelona Institute of Science and Technology, Campus UAB, 08193 Bellaterra, Barcelona, Spain.
The NANOGrav signal may indicate primordial black holes forming from early universe ripples. This aligns with theories about the origin of supermassive black holes.
Area of Science:
- Cosmology
- Astrophysics
- Gravitational Wave Astronomy
Background:
- The North American Nanohertz Observatory for Gravitational Waves (NANOGrav) recently reported evidence for a stochastic gravitational wave background.
- The origin of this background signal remains a key question in modern astrophysics.
Purpose of the Study:
- To investigate whether the NANOGrav signal can be explained by the formation of primordial black holes.
- To connect the observed gravitational wave spectrum with the seeds of supermassive black holes.
Main Methods:
- Interpreting the NANOGrav stochastic gravitational wave signal.
- Analyzing the relationship between high-amplitude curvature perturbations and primordial black hole formation.
Main Results:
- The NANOGrav result is consistent with a stochastic gravitational wave signal originating from primordial black hole formation.
- The predicted gravitational wave spectrum's amplitude and power match the requirements for primordial seeds of supermassive black holes.
Conclusions:
- Primordial black hole formation from high-amplitude curvature perturbations offers a viable explanation for the NANOGrav signal.
- This provides a potential pathway for understanding the origin of supermassive black holes in the early universe.
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