Primordial black holes in a dimensionally reduced universe

Tzikas, Athanasios G.; Nicolini, Piero; Mureika, Jonas; Carr, B. J.

doi:10.1088/1475-7516/2018/12/033

“…This action can also be understood as the D → 2 limit of general relativity [25]. Many issues of 2D gravity have been studied previously under this model, including Nbody motion [26,27,28,29,30], black hole chemistry [31], entropic gravity [32], and the creation of primordial black holes [33]. On the other hand, regular solutions generated by nonlinear matter fields are rarely discussed.…”

Section: Introductionmentioning

confidence: 99%

K-field kinks in two-dimensional dilaton gravity

Zhong,

Li,

Liu

2021

Preprint

0

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In this work, kinks with non-canonical kinetic energy terms are studied in a type of two-dimensional dilaton gravity model. The linear stability issue is generally discussed for arbitrary static solutions with the aid of supersymmetric quantum mechanics theory, and the stability criteria are obtained. As an explicit example, a model with cuscuton term is studied. After rewriting the equations of motion into simpler first-order formalism and choosing a polynomial superpotential, an exact self-gravitating kink solution is obtained. The impacts of the cuscuton term are discussed.

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“…Along this line of reasoning, the repercussions of the dimensional flow have recently been considered by studying the quantum decay of de Sitter space within a two dimensional dilaton gravity formulation [30]. Although classically stable, de Sitter space is quantum mechanically unstable, resulting in the nucleation of black hole pairs 1 .…”

Section: Introductionmentioning

confidence: 99%

“…Black holes produced prior inflation would be washed out with no significant effects on the current Universe [48]. Conversely, the production of primordial black holes in a dimensionally reduced Universe can occur without requiring Planckian values for the cosmological constant [30]. This is a clear advantage that descends from the fact that in (1 + 1) dimensions the gravitational coupling is dimensionless and no actual gravitational scale is associated to it.…”

Section: Introductionmentioning

confidence: 99%

Primordial black holes in a dimensionally oxidizing Universe

Dialektopoulos,

Nicolini,

Tzikas

2020

Preprint

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The spontaneous creation of primordial black holes in a violently expanding Universe is a well studied phenomenon. Based on quantum gravity arguments, it has been conjectured that the early Universe might have undergone a lower dimensional phase before relaxing to the current (3 + 1) dimensional state. In this article we combine the above phenomena: we calculate the pair creation rates of black holes nucleated in an expanding Universe, by assuming a dimensional evolution, we term "oxidation", from (1 + 1) to (2 + 1) and finally to (3 + 1) dimensions. Our investigation is based on the no boundary proposal that allows for the construction of the required gravitational instantons. If, on the one hand, the existence of a dilaton non-minimally coupled to the metric is necessary for black holes to exist in the (1 + 1) phase, it becomes, on the other hand, trivial in (2 + 1) dimensions. Nevertheless, the dilaton might survive the oxidation and be incorporated in a modified theory of gravity in (3 + 1) dimensions: by assuming that our Universe, in its current state, originates from a lower-dimensional oxidation, one might be led to consider the pair creation rate in a sub-class of the Horndeski action. Our findings for this case show that, for specific values of the Galileon coupling to the metric, the rate can be unsuppressed. This would imply the possibility of compelling parameter bounds for non-Einstein theories of gravity by using the spontaneous black hole creation.

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“…Along this line of reasoning, the repercussions of the dimensional flow have recently been considered by studying the quantum decay of de Sitter space within a two dimensional dilaton gravity formulation [30]. Although classically stable, de Sitter space is quantum JCAP10(2020)008…”

Section: Introductionmentioning

confidence: 99%

Primordial black holes in a dimensionally oxidizing Universe

Dialektopoulos

¹

,

Nicolini

²

,

Tzikas

³

2020

J. Cosmol. Astropart. Phys.

Self Cite

0

View full text Add to dashboard Cite

The spontaneous creation of primordial black holes in a violently expanding Universe is a well studied phenomenon. Based on quantum gravity arguments, it has been conjectured that the early Universe might have undergone a lower dimensional phase before relaxing to the current (3 + 1) dimensional state. In this article we combine the above phenomena: we calculate the pair creation rates of black holes nucleated in an expanding Universe, by assuming a dimensional evolution, we term "oxidation", from (1 + 1) to (2 + 1) and finally to (3 + 1) dimensions. Our investigation is based on the no boundary proposal that allows for the construction of the required gravitational instantons. If, on the one hand, the existence of a dilaton non-minimally coupled to the metric is necessary for black holes to exist in the (1 + 1) phase, it becomes, on the other hand, trivial in (2 + 1) dimensions. Nevertheless, the dilaton might survive the oxidation and be incorporated in a modified theory of gravity in (3 + 1) dimensions: by assuming that our Universe, in its current state, originates from a lower-dimensional oxidation, one might be led to consider the pair creation rate in a sub-class of the Horndeski action. Our findings for this case show that, for specific values of the Galileon coupling to the metric, the rate can be unsuppressed. This would imply the possibility of compelling parameter bounds for non-Einstein theories of gravity by using the spontaneous black hole creation.

show abstract

Primordial black holes in a dimensionally reduced universe

Cited by 6 publications

References 71 publications

K-field kinks in two-dimensional dilaton gravity

K-field kinks in two-dimensional dilaton gravity

Primordial black holes in a dimensionally oxidizing Universe

Primordial black holes in a dimensionally oxidizing Universe

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