黑洞中观测到的准周期振荡的爱因斯坦-麦克斯韦膨胀-轴子引力特征

IF 5.9 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Anirban Dasgupta, Nishant Tiwari and Indrani Banerjee
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引用次数: 0

摘要

弦启发模型通常被认为为量子引力和力统一提供了一个有趣的框架,在解决暗物质和暗能量等问题上有很好的前景,这些问题不能令人满意地纳入广义相对论(GR)的框架。本研究的目的是探讨在异质弦理论的低能有效作用下产生的爱因斯坦-麦克斯韦膨胀-轴子(EMDA)引力在解释天体物理观测中的作用,特别是在黑洞功率谱中观测到的高频准周期振荡(HFQPOs)。EMDA引力具有有趣的宇宙学意义,因此在现有的天体物理观测中探索这种理论的足迹是值得的。这需要研究EMDA引力下的静止轴对称黑洞解,它对应于Kerr-Sen时空。这样的黑洞被赋予了扩张电荷,而旋转来自轴子场。我们研究了在Kerr-Sen时空中旋转的物质的轨道和周转频率,并考虑了11个研究得很好的QPO模型。我们将模型相关的QPO频率与五个黑洞源(XTE J1550-564、GRS 1915+105、h143 +322、GRO J1655-40和Sgr A*)的现有观测结果进行了比较。我们的分析提供了上述黑洞自旋的约束条件,与之前的估计相比,这使我们能够理解这些源的观测有利的QPO模型。此外,从目前的数据来看,不能排除EMDA的情况,支持广义相对论。我们评论了我们的发现的意义和局限性,以及目前的限制与现有文献的比较。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Signatures of Einstein-Maxwell dilaton-axion gravity from the observed quasi-periodic oscillations in black holes
String-inspired models are often believed to provide an interesting framework for quantum gravity and force unification with promising prospects to resolve issues like dark matter and dark energy, which cannot be satisfactorily incorporated within the framework of general relativity (GR). The goal of the present work is to investigate the role of the Einstein-Maxwell dilaton-axion (EMDA) gravity arising in the low-energy effective action of the heterotic string theory in explaining astrophysical observations, in particular, the high-frequency quasi-periodic oscillations (HFQPOs) observed in the power spectrum of black holes. EMDA gravity has interesting cosmological implications, and hence it is worthwhile to explore the footprints of such a theory in available astrophysical observations. This requires one to study the stationary, axi-symmetric black hole solution in EMDA gravity, which corresponds to the Kerr-Sen spacetime. Such black holes are endowed with a dilatonic charge while the rotation is sourced from the axionic field. We investigate the orbital and epicyclic frequencies of matter rotating in the Kerr-Sen spacetime and consider eleven well-studied QPO models in this work. We compare the model-dependent QPO frequencies with the available observations of five BH sources, namely, XTE J1550-564, GRS 1915+105, H 143+322, GRO J1655-40 and Sgr A*. Our analysis provides constraints on the spins of the aforesaid black holes which, when compared with previous estimates, enables us to understand the observationally favored QPO models for each of these sources. Further, from the current data, the EMDA scenario cannot be ruled out in favor of general relativity. We comment on the implications and limitations of our findings and how the present constrains compare with the existing literature.
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来源期刊
Journal of Cosmology and Astroparticle Physics
Journal of Cosmology and Astroparticle Physics 地学天文-天文与天体物理
CiteScore
10.20
自引率
23.40%
发文量
632
审稿时长
1 months
期刊介绍: Journal of Cosmology and Astroparticle Physics (JCAP) encompasses theoretical, observational and experimental areas as well as computation and simulation. The journal covers the latest developments in the theory of all fundamental interactions and their cosmological implications (e.g. M-theory and cosmology, brane cosmology). JCAP''s coverage also includes topics such as formation, dynamics and clustering of galaxies, pre-galactic star formation, x-ray astronomy, radio astronomy, gravitational lensing, active galactic nuclei, intergalactic and interstellar matter.
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