Extra-tensor-induced origin for the PTA signal: No primordial black hole production
書誌事項
- 公開日
- 2023-11
- 資源種別
- journal article
- 権利情報
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- https://www.elsevier.com/tdm/userlicense/1.0/
- https://www.elsevier.com/legal/tdmrep-license
- http://creativecommons.org/licenses/by/4.0/
- DOI
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- 10.1016/j.physletb.2023.138214
- 10.48550/arxiv.2307.13109
- 公開者
- Elsevier BV
この論文をさがす
説明
Recently, pulsar timing array (PTA) collaborations announced evidence for an isotropic stochastic gravitational wave (GW) background. The origin of the PTA signal can be astrophysical or cosmological. In the latter case, the so-called secondary scalar-induced GW scenario is one of the viable explanations, but it has a potentially serious issue of the overproduction of primordial black holes (PBHs) due to the enhanced curvature perturbation. In this letter, we present a new interpretation of the PTA signal. Namely, it is originated from an extra spectator tensor field that exists on top of the metric tensor perturbation. As the energy density of the extra tensor field is always subdominant, it cannot lead to the formation of PBHs. Thus our primordial-tensor-induced scenario is free from the PBH overproduction issue.
5 pages, version to appear in PLB
収録刊行物
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- Physics Letters B
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Physics Letters B 846 138214-, 2023-11
Elsevier BV
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詳細情報 詳細情報について
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- CRID
- 1360865814728577408
-
- ISSN
- 03702693
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- 資料種別
- journal article
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- データソース種別
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- Crossref
- KAKEN
- OpenAIRE
