arXiv subjects

Itzi Aldecoa-Tamayo

Publications and source records attributed to Itzi Aldecoa-Tamayo.

3 recordsLinked to original sources

arXiv2026

Primordial black holes in braneworld gravity: A gateway to hidden dimensions and the dark Universe

This thesis investigates the cosmological dynamics of primordial black holes (PBHs) within the Randall--Sundrum Type II braneworld scenario. The work comprises a preliminary discussion on gravitational collapse in the small-black-hole limit at early cosmological epochs, and two principal studies. The first study presents a fully relativistic treatment of PBH accretion in the early Universe, employing Michel accretion theory within the covariant Shiromizu--Maeda--Sasaki formalism. The analysis reveals that higher-dimensional effects substantially enhance early-time accretion onto light PBHs, with discrepancies between our black hole masses and previous estimates growing with cosmic time as $t^{0.33}$ --- a difference that reaches several orders of magnitude by the end of the strong-accretion epoch. This finding fundamentally alters the mapping between the initial PBH mass spectrum and present-day populations. The second study reassesses the observational and cosmological constraints on higher-dimensional PBHs in Randall--Sundrum cosmologies. Constraints from direct Hawking radiation, unresolved diffuse gamma-ray backgrounds, microlensing surveys, and energy injection into the cosmic microwave background are reanalysed in light of the modified higher-dimensional evaporation dynamics and updated observational surveys. Taken together, these results identify viable regions of parameter space in which PBHs can account for the entirety of dark matter while remaining consistent with current observational bounds. Notably, due to the enhanced accretion epoch, PBHs capable of constituting a significant fraction of dark matter may originate from masses below the effective four-dimensional Planck scale. This thesis thus puts forward a dark matter candidate with a distinct evolutionary history and observational signatures today.

gr-qc↗

arXiv2026

Cosmological accretion onto braneworld black holes: a relativistic treatment

Higher-dimensional black holes have been extensively studied over the years, primarily from heuristic and fundamental perspectives or within the context of holographic applications. However, their interaction with ordinary matter confined to the brane is also of particular interest in cosmology. In this work, we revisit accretion within the Randall-Sundrum type II framework, employing the covariant Shiromizu-Maeda-Sasaki formalism together with the Gauss-Codazzi and energy conservation equations. We analyse information propagation in the cosmological fluid and implement a fully relativistic treatment of accretion following Michel's prescription. We find that braneworld effects play a significant role in the early Universe, strongly impacting the evolution of light primordial black holes (PBHs). In particular, the mapping between initial conditions and present-day PBH populations is substantially modified by an extended phase of early-time accretion that is significantly more efficient than previously found. For certain regions of parameter space, PBHs that could contribute to the present-day dark matter abundance may have formed with masses below the effective four-dimensional Planck scale. The discrepancy between our black hole masses and the most optimistic previous estimates grows as $t^{0.34}$-a significant difference that reaches up to several orders of magnitude by the end of the strong-accretion epoch, particularly for black holes that form early and for small values of the fundamental Planck scale $M_5$, reaching up to $\sim 10^5$ for the smallest $M_5$ permitted by observations.

gr-qc↗

arXiv2025

Primordial black holes in Randall-Sundrum: Cosmological signatures

We reconsider primordial black hole physics in Randall-Sundrum Type-II universes, focusing on constraints from cosmological and astrophysical observables. We pay particular attention to scenarios that allow the entirety of dark matter to be in the form of higher-dimensional primordial black holes. This is possible for a range of AdS radii and black hole masses. Observable constraints are generally modified due to the changes in the higher-dimensional gravitational sector, and come from low-energy $e^{\pm}$ emission, microlensing, and possibly from contributions to unresolved radiation backgrounds. We discuss constraints from the cosmic microwave background due to injection of Hawking quanta into the intergalactic medium. Finally, we comment on recent discussions on the compatibility of higher-dimensional black holes and the KM3-230213A event.

astro-ph.CO↗