Primordial black holes

Khlopov, Maxim Yu.

doi:10.1088/1674-4527/10/6/001

Cited by 509 publications

(384 citation statements)

References 300 publications

(523 reference statements)

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“…Among a large variety of models, it has been proposed that dark matter is composed totally or partially by primordial black holes (PBHs) [1][2][3][4][5][6]. These are formed in the early Universe when sufficiently large density fluctuations collapse gravitationally.…”

Section: Introductionmentioning

confidence: 99%

Massive primordial black holes from hybrid inflation as dark matter and the seeds of galaxies

2015

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In this paper we present a new scenario where massive primordial black holes (PBHs) are produced from the collapse of large curvature perturbations generated during a mild-waterfall phase of hybrid inflation. We determine the values of the inflaton potential parameters leading to a PBH mass spectrum peaking on planetarylike masses at matter-radiation equality and producing abundances comparable to those of dark matter today, while the matter power spectrum on scales probed by cosmic microwave background (CMB) anisotropies agrees with Planck data. These PBHs could have acquired large stellar masses today, via merging, and the model passes both the constraints from CMB distortions and microlensing. This scenario is supported by Chandra observations of numerous BH candidates in the central region of Andromeda. Moreover, the tail of the PBH mass distribution could be responsible for the seeds of supermassive black holes at the center of galaxies, as well as for ultraluminous x-ray sources. We find that our effective hybrid potential can originate e.g. from D-term inflation with a Fayet-Iliopoulos term of the order of the Planck scale but sub-Planckian values of the inflaton field. Finally, we discuss the implications of quantum diffusion at the instability point of the potential, able to generate a Swiss-cheese-like structure of the Universe, eventually leading to apparent accelerated cosmic expansion.

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Section: Introductionmentioning

confidence: 99%

Massive primordial black holes from hybrid inflation as dark matter and the seeds of galaxies

2015

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“…The case δ i ≥ 1 within the considered i-th component corresponds to its strong inhomogeneity. Strong inhomogeneity is compatible with the smallness of total density fluctuations if the contribution of the inhomogeneous component into the total density is small: i , so that δ 1 (see Reference [35] for review). The presence of new forms of matter can influence the properties of matter and radiation either indirectly (i.e., changing the cosmological equation of state) or via direct interaction with matter and radiation.…”

Section: Cosmoarcheology Of New Physicsmentioning

confidence: 99%

“…This mechanism can lead to the formation of primordial black holes of a whatever large mass (up to the mass of active galactic nuclei (AGNs) [123,124], see for latest review Reference [35]). Such black holes appear in the form of primordial black hole clusters, exhibiting fractal distribution in space [114,122,125].…”

Section: Primordial Seeds For Active Galactic Nucleimentioning

confidence: 99%

Cosmological Reflection of Particle Symmetry

Khlopov

2016

Symmetry

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The standard model involves particle symmetry and the mechanism of its breaking. Modern cosmology is based on inflationary models with baryosynthesis and dark matter/energy, which involves physics beyond the standard model. Studies of the physical basis of modern cosmology combine direct searches for new physics at accelerators with its indirect non-accelerator probes, in which cosmological consequences of particle models play an important role. The cosmological reflection of particle symmetry and the mechanisms of its breaking are the subject of the present review.

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“…III) stars now appear not to be the such seeds, as sufficiently high stellar masses are less common than previously though (Turk et al 2009;Clark et al 2011;Greif et al 2011;Stacy et al 2012). Suitable seeds are nevertheless possible via direct gas collapse, quasi-stars produced by very high gas infall rates, the collapse of star clusters or even primordial black holes, formed much before the epoch of galaxy formation (e.g., Carr 2003;Bromm & Loeb 2003;Mayer et al 2010;Begelman 2010;Devecchi et al 2010Devecchi et al , 2012Khlopov 2010).…”

Section: The Onset Of Very High Redshift Agn Activitymentioning

confidence: 99%

Identifying the first generation of radio powerful AGN in the Universe with the SKA

Afonso¹,

Casanellas²,

Prandoni³

et al. 2015

Proceedings of Advancing Astrophysics With the Square Kilometre Array — PoS(AASKA14)

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One of the most challenging and exciting subjects in modern astrophysics is that of galaxy formation at the epoch of reionisation. The SKA, with its revolutionary capabilities in terms of frequency range, resolution and sensitivity, will allow to explore the first Gyr of structure formation in the Universe, in particular, with the detection and study of the earliest manifestations of the AGN phenomenon. The tens of QSOs that are currently known out to the highest redshifts (z ∼ 7), many of them exhibiting powerful radio emission, imply that super-massive black holes can be grown on a very short timescale and support the existence of very high redshift (z > 7) radio loud sources -sources that have so far escaped detection. Not only would such detections be paramount to the understanding of the earliest stages of galaxy evolution, they are necessary for the direct study of neutral hydrogen in the Epoch of Reionisation, through observations of the HI 21cm forest against such background sources. In order to understand how SKA and SKA1 observations can be optimised to reveal these earliest AGN, we have examined the effect of a hot CMB on the emission of powerful and young radio galaxies. By looking at the SKA1 capabilities, in particular in terms of wavelength coverage and resolution, we determine how the effects of "CMB-muting" of a radio loud source can be observationally minimised and how to identify the best highest-redshift radio candidates. Considering different predictions for the space density of radio loud AGN at such redshifts, we identify the survey characteristics necessary to optimize the detection and identification of the very first generation of radio loud AGN in the Universe.Advancing Astrophysics with the Square Kilometre Array

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Primordial black holes

Cited by 509 publications

References 300 publications

Massive primordial black holes from hybrid inflation as dark matter and the seeds of galaxies

Massive primordial black holes from hybrid inflation as dark matter and the seeds of galaxies

Cosmological Reflection of Particle Symmetry

Identifying the first generation of radio powerful AGN in the Universe with the SKA

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