Cosmological black holes are not described by the Thakurta metric: LIGO-Virgo bounds on PBHs remain unchanged

Hütsi, Gert; Koivisto, Tomi S.; Raidal, M.; Vaskonen, Ville; Veermäe, Hardi

doi:10.1140/epjc/s10052-021-09803-4

Cited by 12 publications

(5 citation statements)

References 49 publications

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“…This is, in fact, highly relevant to currently ongoing discussions in the literature, concerning e.g. the possible physical application of the Thakurta solution [130] (in the context of primordial holes and their possible contribution to the dark matter density [131][132][133][134]). A formal definition seems to show that the Thakurta solution does not describe a black hole at all, since the solution does not possess a future trapped horizon [135].…”

Section: Energymentioning

confidence: 99%

See 1 more Smart Citation

Energy and entropy in the Geometrical Trinity of gravity

Gomes¹,

Jiménez²,

Koivisto³

2022

Preprint

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All energy is gravitational energy. That is the consequence of the equivalence principle, according to which gravity is the universal interaction. The physical charges of this interaction have remained undisclosed, but the Advent of the Geometrical Trinity opened a new approach to this foundational problem. Here it is shown to provide a background-independent unification of the previous, noncovariant approaches of Bergmann-Thomson, Cooperstock, Einstein, von Freud, Landau-Lifshitz, Papapetrou and Weinberg. First, the Noether currents are derived for a generic Palatini theory of gravity coupled with generic matter fields, and then the canonical i.e. the unique charges are robustly derived and analysed, particularly in the metric teleparallel and the symmetric teleparallel versions of General Relativity. These results, and their application to black holes and gravitational waves, are new.

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Section: Energymentioning

confidence: 99%

“…Thus, despite the claims of Ref. [135], and irregardless of their possible relevance to the dark matter problem which is a separate issue [131][132][133][134], Thakurta black holes are black holes.…”

Section: Energymentioning

confidence: 99%

Energy and entropy in the Geometrical Trinity of gravity

Gomes¹,

Jiménez²,

Koivisto³

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Another example of how variable the constraints obtained via PBH evaporation are can be seen by using a different metric to compute the Hawking radiation. [112] used the Thakurta metric to find very different results with Hawking radiation being notably boosted, though note that the metric they chose as an alternative is contentious as being a good description of PBHs [113], so their constraints are not reflected in figure 1.…”

Section: Black Hole Evaporationmentioning

confidence: 99%

Constraints on PBH as dark matter from observations: a review

Oncins¹

2022

Preprint

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Primordial black holes (PBHs) are a fascinating candidate for being the dark matter, albeit one which has been heavily constrained. This review presents an in depth look at those observational constraints, particularly at their nuances and uncertainties. Despite their varied origins, the standard PBH formation path is assumed to be collapse of perturbations after inflation, which should leave signals visible in the CMB at certain scales. Other constraints come from microlensing surveys, which severely limit PBHs as dark matter in the solar to satellite range, but there are diminishing results in regards to lower mass ranges. Gravitational waves signals and PBH evaporation from Hawking radiation also make for useful probes, but the former requires the next generation of experiments before making constraints beyond the solar mass range, and the later is severely limited above 10 −16 M . Other dynamical and accretion constraints exist for PBH of large masses. Care also has to be given, as all these constraints can carry different implications coming from differences between monochromatic and extended mass distributions, and their degree of clustering. Beyond all these issues, a window still exists for primordial black holes to be all of the dark matter between 10 −16 and 10 −11 M .

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“…There has been recent discussion in the literature over the validity of the Thakurta metric as a black hole solution [3,14]. One issue regards the nature of the Thakurta apparent horizon.…”

Section: Introductionmentioning

confidence: 99%

Apparent horizons of the Thakurta spacetime and the description of cosmological black holes

Kobakhidze,

Picker

2021

Preprint

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We discuss the validity of the Thakurta metric to describe cosmological black holes by analysing the nature of its horizon. By adopting the preferred foliation of the Thakurta spacetime associated with the Kodama time, we demonstrate that the Thakurta horizon is indeed a future outer trapping horizon. Therefore, the respective observers see it as a cosmological black hole, contrary to some claims in the literature.

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Cosmological black holes are not described by the Thakurta metric: LIGO-Virgo bounds on PBHs remain unchanged

Cited by 12 publications

References 49 publications

Energy and entropy in the Geometrical Trinity of gravity

Energy and entropy in the Geometrical Trinity of gravity

Constraints on PBH as dark matter from observations: a review

Apparent horizons of the Thakurta spacetime and the description of cosmological black holes

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