Tootfinder

Status:
Betittas - big bang theory (har börjat om på S1)
Ses igenom - nytvättade fönster utan måsbajs på
Känns - svett över hela kroppen

The Baby Universe is Fine and the CFT Knows It: On Holography for Closed Universes
Stefano Antonini, Pratik Rath, Martin Sasieta, Brian Swingle, Alejandro Vilar L\'opez
https://arxiv.org/abs/2507.10649

The Baby Universe is Fine and the CFT Knows It: On Holography for Closed Universes
Big bang/big crunch closed universes can be realized in AdS/CFT, even though they lack asymptotically AdS boundaries. With enough bulk entanglement, the bulk Hilbert space of a closed universe can be holographically encoded in the CFT. We clarify the relation of this encoding to observer-clone proposals and refute recent arguments about the breakdown of semiclassical physics in such spaces. In the limit of no bulk entanglement, the holographic encoding breaks down. The oft-cited one-dimensional…

Probing Cosmic Neutrino Background through Parametric Fluorescence
Guo-yuan Huang, Shun Zhou
https://arxiv.org/abs/2507.10868 https://

Probing Cosmic Neutrino Background through Parametric Fluorescence
We point out that relic neutrinos from the Big Bang may induce the parametric fluorescence in molecular systems, which offers a novel way to discover cosmic neutrino background. By coherently scattering with molecular energy levels, a massive neutrino can spontaneously ``decay" into a lighter neutrino and an infrared signal photon, i.e., $ν^{}_{i} + M \to ν^{}_{j} + γ^{}_{\rm S} + M$, where the molecular state $M$ remains unchanged after the scattering. Because the amplitudes of different ra…

An Ultra-Faint, Chemically Primitive Galaxy Forming at the Epoch of Reionization
Kimihiko Nakajima, Masami Ouchi, Yuichi Harikane, Eros Vanzella, Yoshiaki Ono, Yuki Isobe, Moka Nishigaki, Takuji Tsujimoto, Fumitaka Nakamura, Yi Xu, Hiroya Umeda, Yechi Zhang
https://arxiv.org/abs/2506.11846…

An Ultra-Faint, Chemically Primitive Galaxy Forming at the Epoch of Reionization
The formation of the first stars and galaxies marked the onset of cosmic structure and chemical enrichment, yet direct observations of such primordial systems remain elusive. Here we present James Webb Space Telescope spectroscopic observations of LAP1-B, an ultra-faint galaxy at redshift z_{spec}=6.625 +/-0.001, corresponding to a cosmic age of 800 million years after the Big Bang, strongly magnified by gravitational lensing. LAP1-B exhibits a gas-phase oxygen abundance of (4.2 +/- 1.8) x 10^{…

The most energetic transients - tidal disruptions of high-mass stars: #ExtremeNuclearTransients (ENTs) are the most energetic transients yet observed.

No Hiding in the Dark: Cosmological Bounds on Heavy Neutral Leptons with Dark Decay Channels
P. S. Bhupal Dev, Quan-feng Wu, Xun-Jie Xu
https://arxiv.org/abs/2507.12270

No Hiding in the Dark: Cosmological Bounds on Heavy Neutral Leptons with Dark Decay Channels
Heavy neutral leptons (HNLs) are well-motivated new physics candidates. The mixing of sub-GeV HNLs with active neutrinos is severely constrained by cosmology. In particular, the success of Big Bang Nucleosynthesis (BBN) requires the HNL lifetime to be shorter than about 0.02 sec if they were in thermal equilibrium, thus excluding a wide range of mixing angles accessible to terrestrial experiments. In order to justify the laboratory searches in this cosmologically-forbidden region, it is often a…

The Big Bang's Glowing 'Echo' May Be Something Else Entirely : ScienceAlert
https://www.sciencealert.com/the-big-bangs-glowing-echo-may-be-something-else-entirely

My Mastodon instance updated UI.😍
It's is more clear and usable...I hate it!😆
[this joke was stolen from Big Bang Theory]

Few-grid-point simulations of Big Bang singularity in quantum cosmology
Miloslav Znojil
https://arxiv.org/abs/2506.14848 https://arxi…

Few-grid-point simulations of Big Bang singularity in quantum cosmology
In the context of the current lack of compatibility of the classical and quantum approaches to gravity, exactly solvable elementary pseudo-Hermitian quantum models are analyzed supporting the acceptability of a point-like form of Big Bang. The purpose is served by a hypothetical (non-covariant) identification of the ``time of Big Bang'' with the Kato's exceptional-point parameter $t=0$. Consequences (including the ambiguity of the patterns of unfolding of the singularity after Big Bang) are stu…

Lessons from a Big-Bang Integration: Challenges in Edge Computing and Machine Learning
Alessandro Aneggi, Andrea Janes
https://arxiv.org/abs/2507.17270 htt…

Lessons from a Big-Bang Integration: Challenges in Edge Computing and Machine Learning
This experience report analyses a one year project focused on building a distributed real-time analytics system using edge computing and machine learning. The project faced critical setbacks due to a big-bang integration approach, where all components developed by multiple geographically dispersed partners were merged at the final stage. The integration effort resulted in only six minutes of system functionality, far below the expected 40 minutes. Through root cause analysis, the study identifi…

This https://arxiv.org/abs/2411.16505 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Pre-Big-Bang Cosmology Cannot Explain NANOGrav 15-year Signal
We investigate whether the Pre-Big Bang (PBB) scenario from string cosmology can explain the stochastic gravitational wave background signal reported in the NANOGrav 15-year dataset. Using Bayesian analysis techniques, we constrain the key parameters of the PBB model by comparing its theoretical predictions with the observed data. Our analysis yields $β= -0.12^{+0.06}_{-0.21}$ ($90\%$ credible interval) for the dilaton-dynamics parameter, which lies outside the theoretically allowed range $0 \…

Nomad cluster powered down.
Everything is now running in a k3s monocluster on a Radxa Rock5b
What feels insane is I started this project in December.... But lots of little edge cases and such to solve for just like any real migration.
I'm using fluxcd and all my configurations are pretty decent. I could do a big-bang redeploy on a new machine and everything would work.
#homelab

A fast radio burst from the first 3 billion years of the Universe
Manisha Caleb, Themiya Nanayakkara, Benjamin Stappers, In\'es Pastor-Marazuela, Ilya S. Khrykin, Karl Glazebrook, Nicolas Tejos, J. Xavier Prochaska, Kaustubh Rajwade, Lluis Mas-Ribas, Laura N. Driessen, Wen-fai Fong, Alexa C. Gordon, Jordan Hoffmann, Clancy W. James, Fabian Jankowski, Lordrick Kahinga, Michael Kramer, Sunil Simha, Ewan D. Barr, Mechiel Christiaan Bezuidenhout, Xihan Deng, Zeren Lin, Lachlan Marnoch,…

A fast radio burst from the first 3 billion years of the Universe
Fast radio bursts (FRBs) are enigmatic millisecond-duration signals which encode otherwise unattainable information on the plasma which permeates our Universe, providing insights into magnetic fields and gas distributions. Here we report the discovery of FRB 20240304B originating at redshift 2.148 +/- 0.001 corresponding to just 3 billion years after the Big Bang. FRB 2024030 was detected with the MeerKAT radio telescope and localized to a low-mass, clumpy, star forming galaxy using the James W…

Consistent $N_{\rm eff}$ fitting in big bang nucleosynthesis analysis
Sougata Ganguly, Tae Hyun Jung, Seokhoon Yun
https://arxiv.org/abs/2507.23354 https://

Consistent $N_{\rm eff}$ fitting in big bang nucleosynthesis analysis
The effective number of neutrino species, $N_{\rm eff}$, serves as a key fitting parameter extensively employed in cosmological studies. In this work, we point out a fundamental inconsistency in the conventional treatment of $N_{\rm eff}$ in big bang nucleosynthesis (BBN), particularly regarding its applicability to new physics scenarios where $ΔN_{\rm eff}$, the deviation of $N_{\rm eff}$ from the standard BBN prediction, is negative. To ensure consistent interpretation, it is imperative to e…

Resonant neutrino self-interactions: insights from the full shape galaxy power spectrum
Hern\'an E. Noriega, Josue De-Santiago, Gabriela Garcia-Arroyo, Jorge Venzor, Abdel P\'erez-Lorenzana
https://arxiv.org/abs/2506.07994

Resonant neutrino self-interactions: insights from the full shape galaxy power spectrum
This paper investigates resonant neutrino self-interactions in cosmology by employing, for the first time, the effective field theory of large-scale structure to model their impact on the matter distribution up to mildly nonlinear scales. We explore a broad range of mediator masses in two main analyses: one combining BOSS Full Shape (FS) galaxy clustering with Big Bang Nucleosynthesis (BBN), and another combining FS with Planck Cosmic Microwave Background (CMB) data. Our results place the stron…

Presentist Fragmentalism and Quantum Mechanics
Paul Merriam
https://arxiv.org/abs/2508.06006 https://arxiv.org/pdf/2508.06006

Presentist Fragmentalism and Quantum Mechanics
This paper states and gives three applications of a novel Presentist Fragmentalist interpretation of quantum mechanics. In a cognate paper it was explicitly shown this kind of presentism is consistent with special relativity and that it has implications for how to understand time as it relates to the Big Bang, 5. In this paper we narrowly focus on three applications. These are surely the most important conundrums for any proposed interpretation of quantum mechanics, Schrodingers Cat, Bell nonlo…

Stability of Big Bang singularity for the Einstein-Maxwell-scalar field-Vlasov system in the full strong sub-critical regime
Xinliang An, Taoran He, Dawei Shen
https://arxiv.org/abs/2507.18585

Stability of Big Bang singularity for the Einstein-Maxwell-scalar field-Vlasov system in the full strong sub-critical regime
In $3+1$ dimensions, we study the stability of Kasner solutions for the Einstein-Maxwell-scalar field-Vlasov system. This system incorporates gravity, electromagnetic, weak and strong interactions for the initial stage of our universe. Due to the presence of the Vlasov field, various new challenges arise. By observing detailed mathematical structures and designing new delicate arguments, we identify a new strong sub-critical regime and prove the nonlinear stability with Kasner exponents lying i…

This https://arxiv.org/abs/2505.22567 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

A black hole in a near-pristine galaxy 700 million years after the Big Bang
The recent discovery of a large number of massive black holes within the first two billion years after the Big Bang, as well as their peculiar properties, have been largely unexpected based on the extrapolation of the properties of luminous quasars. These findings have prompted the development of several theoretical models for the early formation and growth of black holes, which are, however, difficult to differentiate. We report the metallicity measurement around a gravitationally lensed massi…

The quark-gluon plasma: diagnosis with thermal hadron production from the early history until detailed characterization at high energy colliders
Peter Braun-Munzinger, Krzysztof Redlich, Johanna Stachel
https://arxiv.org/abs/2506.04733

The quark-gluon plasma: diagnosis with thermal hadron production from the early history until detailed characterization at high energy colliders
In nuclear collisions at relativistic energies, matter is created which resembles closely the matter that filled all space until about 15 microseconds after the big bang. Here we summarize selected aspects of the research that led to the establishment of this new sub-field of physics and briefly describe its current `state of the art' with emphasis on matter creation through thermal particle production. In particular, we will focus on particle production at low transverse momentum and explain h…

New bounds on Memory Burdened Primordial Black Holes from Big Bang Nucleosynthesis
Arnab Chaudhuri, Kazunori Kohri, Valentin Thoss
https://arxiv.org/abs/2506.20717

New bounds on Memory Burdened Primordial Black Holes from Big Bang Nucleosynthesis
Primordial black holes (PBHs) with masses below $10^9\,\rm{g}$ are typically assumed to have negligible cosmological impact due to their rapid evaporation via Hawking radiation. However, the 'memory burden' effect, which is a quantum suppression of PBH evaporation, can dramatically alter their decay dynamics. In this work, we revisit early-Universe constraints on ultralight PBHs in this mass range, demonstrating that memory burden significantly alters previous constraints. We compute new cosmol…

New Determination of the $^{14}$C(n, $\gamma$)$^{15}$C Reaction Rate and Its Astrophysical Implications
Yuchen Jiang (China Institute of Atomic Energy, Beijing, China), Zhenyu He (School of Physics, International Research Center for Big-Bang Cosmology and Element Genesis, Peng Huanwu Collaborative Center for Research and Education, Beihang University, Beijing, China), Yudong Luo (School of Physics, Peking University, and Kavli Institute for Astronomy and Astrophysics, Peking University…

New Determination of the $^{14}$C(n, $γ$)$^{15}$C Reaction Rate and Its Astrophysical Implications
We present a novel experiment to investigate the spectroscopic factor of the $^{15}$C ground state for the first time using single-neutron $removal$ transfer reactions on $^{15}$C. Two consistent spectroscopic factors were derived from the (p, d) and (d, t) reactions, which were subsequently used to deduce the $^{14}$C(n, $γ$)$^{15}$C reaction cross section and the corresponding stellar reaction rate. A typical cross section of (3.89 $\pm$ 0.76) $μ$b is determined at $E_\mathrm{_{c.m.}}$ = 23…

A large, chemically enriched, neutral gas reservoir in a galaxy at z = 6.782
A. Saccardi, S. D. Vergani, L. Izzo, V. D'Elia, K. E. Heintz, A. De Cia, D. B. Malesani, J. T. Palmerio, P. Petitjean, S. Savaglio, N. R. Tanvir, R. Salvaterra, R. Brivio, S. Campana, L. Christensen, S. Covino, J. P. U. Fynbo, D. H. Hartmann, C. Konstantopoulou, A. J. Levan, A. Martin-Carrillo, A. Melandri, L. Piro, G. Pugliese, P. Schady, B. Schneider

A large, chemically enriched, neutral gas reservoir in a galaxy at z = 6.782
The chemical characterization of galaxies in the first billion years after the Big Bang is one of the central goals of current astrophysics. Optical/near-infrared spectroscopy of long gamma-ray bursts (GRBs) have been heralded as an effective diagnostic to probe the interstellar medium of their host galaxies and their metal and dust content, up to the highest redshift. An opportunity to fulfill this expectation was provided by the recent blast triggered by the Neil Gehrels Swift Observatory of …

A conformal basis for cosmology with energy conservation
J. M. Greben
https://arxiv.org/abs/2508.00948 https://arxiv.org/pdf/2508.00948

A conformal basis for cosmology with energy conservation
In the standard FRW formalism, the scale factor is assumed to describe the expansion of the universe. However, by examining empty space with a positive cosmological constant (i.e., a de Sitter space), we find that this assumption is incorrect. When described in conformal time, the associated conformal metric exhibits a big bang singularity where the effective vacuum energy density diverges, dominating the early universe. The corresponding FRW scale factor decreases after the big bang, so that i…

Primordial black hole induced gravitational waves in $f(R)$ gravity
Theodoros Papanikolaou, Salvatore Capozziello
https://arxiv.org/abs/2508.03939 https://…

Primordial black hole induced gravitational waves in $f(R)$ gravity
Ultra-light primordial black holes (PBHs) with masses $M_\mathrm{PBH}<5\times 10^{8}\mathrm{g}$ can trigger an early matter-dominated (eMD) era before Big Bang Nucleosynthesis (BBN) and reheat the Universe through their evaporation. Notably, the initial isocurvature in nature PBH energy density fluctuations can induce abundantly gravitational waves (GWs) due to second-order gravitational effects. In this work, we study this induced GW signal within the context of $f(R)$ gravity theories investi…

Primordial high energy neutrinos: theoretical/observational constraints and sharp spectral features
Nicolas Grimbaum Yamamoto, Thomas Hambye
https://arxiv.org/abs/2507.02063

Primordial high energy neutrinos: theoretical/observational constraints and sharp spectral features
Among the few ways that allow or could allow us to probe the early Universe from the observation of a flux of primordial particles, there is one possibility which has been little studied: the observation today of high energy neutrinos which could have been emitted shortly after the Big Bang, from the decay or annihilation of early universe relics. We perform a general study of such a possibility. To this end we first emphasise that these neutrinos could display various kinds of sharp spectral f…

Cosmology with Distinct Functions $f$ of the Non-metricity Scalar $Q$ : A Dynamical System Approach
Promila Biswas, Subhajit Pal, Ritabrata Biswas, Satyajit Pal
https://arxiv.org/abs/2506.21646

Cosmology with Distinct Functions $f$ of the Non-metricity Scalar $Q$ : A Dynamical System Approach
Symmetric teleparallel gravity is one among the general relativistic trinity which deals with the non-metricity scalar $Q$. In the Einstein Hilbert action, a function of $Q$ is chosen to be the main contributory part of the Lagrangian and a modified theory of gravity is constructed. In literature, different structures of the function of $Q$ are found which sustain several astrophysical observations like Big Bang nucleosynthesis, late-time cosmic acceleration etc. Autonomous systems for each suc…

Hot New Early Dark Energy: Dark Radiation Matter Decoupling
Mathias Garny, Florian Niedermann, Henrique Rubira, Martin S. Sloth
https://arxiv.org/abs/2508.03795 https://

Hot New Early Dark Energy: Dark Radiation Matter Decoupling
We present a microscopic model of the dark sector that resolves the Hubble tension within standard current datasets based on well-known fundamental principles, gauge symmetry and spontaneous symmetry breaking. It builds on the Hot New Early Dark Energy (Hot NEDE) setup, featuring a dark $SU(N)$ gauge symmetry broken to $SU(N-1)$ in a supercooled phase transition that creates a thermal bath of self-interacting dark radiation in the epoch between Big Bang Nucleosynthesis and recombination. Adding…

This https://arxiv.org/abs/2412.12205 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_nuc…

Radiative Capture Reaction $d(α,γ)^{6}\mathrm{Li} $ in Cluster Effective Field Theory
In this study, we focus on the radiative capture process of the deuteron on alpha particle leading to the formation of $^6{\textrm{Li}}$ in the two-body formalism through the cluster effective field theory~(CEFT). It was the primitive nuclear reaction to produce ${^6 \textrm{Li}}$ in a few minutes after the Big Bang. In detail, we outline the calculation of the dominant $E1$ and $E2$ electromagnetic transition amplitudes of $d(α,γ){^6\textrm{Li}}$. Then, we obtain the astrophysical S-factor b…

Constraints on R\'{e}nyi Entropy through Primordial Big-Bang Nucleosynthesis and Baryogenesis
Ahmad Sheykhi, Ava Shahbazi Sooraki
https://arxiv.org/abs/2507.14250 https://…

Constraints on Rényi Entropy through Primordial Big-Bang Nucleosynthesis and Baryogenesis
The Rényi entropy, a one-parameter generalization of Boltzmann-Gibbs entropy, offers a promising framework for probing quantum gravitational effects in cosmology. By modifying the entropy-area relation of the apparent horizon, Rényi entropy can alter the expansion dynamics of the early universe, with potential implications for Big-Bang Nucleosynthesis. In this work, we derive the modified Friedmann equations within the Rényi entropy paradigm and investigate their impact on the primordial abu…

JADES-GS-z14-1: A Compact, Faint Galaxy at $z\approx14$ with Weak Metal Lines from Extremely Deep JWST MIRI, NIRCam, and NIRSpec Observations
Zihao Wu, Daniel J. Eisenstein, Benjamin D. Johnson, Peter Jakobsen, Stacey Alberts, Santiago Arribas, William M. Baker, Andrew J. Bunker, Stefano Carniani, St\'ephane Charlot, Jacopo Chevallard, Mirko Curti, Emma Curtis-Lake, Francesco D'Eugenio, Kevin Hainline, Jakob M. Helton, Tiger Yu-Yang Hsiao, Xihan Ji, Zhiyuan Ji, Tobias J. Looser…

JADES-GS-z14-1: A Compact, Faint Galaxy at $z\approx14$ with Weak Metal Lines from Extremely Deep JWST MIRI, NIRCam, and NIRSpec Observations
JWST has shed light on galaxy formation and metal enrichment within 300 Myr of the Big Bang. While luminous galaxies at $z > 10$ often show significant [O III]$λλ$4959, 5007 emission lines, it remains unclear whether such features are prevalent among fainter, more typical galaxies due to observational limits. We present deep imaging and spectroscopy of JADES-GS-z14-1 at $z_\mathrm{spec}=13.86^{+0.04}_{-0.05}$, currently the faintest spectroscopically confirmed galaxy at $z\approx 14$. It sere…

Nonminimal infrared gravitational reheating in light of ACT
Ayan Chakraborty, Debaprasad Maity, Rajesh Mondal
https://arxiv.org/abs/2506.02141 https://

Nonminimal infrared gravitational reheating in light of ACT
Inflation is known to produce large infrared scalar fluctuations. Further, if a scalar field $(χ)$ is non-minimally coupled with gravity through $ξχ^2 R$, those infrared modes experience \textit{tachyonic instability} during and after inflation. Those large non-perturbative infrared modes can collectively produce hot Big Bang universe upon their horizon entry during the post-inflationary period. We indeed find that for reheating equation of state (EoS), $w_ϕ > 1/3$, and coupling strength, $…

This https://arxiv.org/abs/2504.05003 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_nuc…

The role of the screening potential in the deuteron-deuteron thermonuclear reaction rates
The deuteron-deuteron (D-D) thermonuclear reaction rates in metallic environments (considering the electron screening effects) is calculated using the S-factor functions which were obtained by fitting to low-energy data on D-D reactions. For this purpose, a fitted S-factor model based on the NACRE compilation is employed. This limited the energy range of Big Bang nucleosynthesis (BBN) for the $ ^{2}\textrm{H}\left(d,p\right) ^{3}\textrm{H}$ and $^{2} \textrm{H} \left(d,n\right) ^{3}\t…

Return of the Lepton Number: Sterile Neutrino Dark Matter Production and the Revival of the Shi-Fuller Mechanism
Cannon M. Vogel, Helena Garc\'ia Escudero, Julien Froustey, Kevork N. Abazajian
https://arxiv.org/abs/2507.18752

Return of the Lepton Number: Sterile Neutrino Dark Matter Production and the Revival of the Shi-Fuller Mechanism
We explore resonant production of sterile neutrino dark matter via the Shi-Fuller (SF) mechanism, revisiting its cosmological viability in light of recent results demonstrating that lepton-number asymmetries $L_α\gtrsim 1$ at temperatures $T > 20\rm\,MeV$ are consistent with Big Bang Nucleosynthesis (BBN). Using a quasi-classical Boltzmann transport calculation of the dark matter production, we compute the non-thermal phase space distributions of sterile neutrinos across a broad range of parti…

The z = 9.625 Cosmic Gems Galaxy was a "Compact Blue Monster" Propelled by Massive Star Clusters
E. Vanzella, M. Messa, A. Adamo, F. Loiacono, M. Oguri, K. Sharon, L. D. Bradley, P. Bergamini, M. Meneghetti, A. Claeyssens, B. Welch, M. Bradac, A. Zanella, A. Bolamperti, F. Calura, T. Y-Y. Hsiao, E. Zackrisson, M. Ricotti, L. Christensen, J. M. Diego, F. E. Bauer, X. Xu, S. Fujimoto, C. Grillo, M. Lombardi, P. Rosati, T. Resseguier, A. Zitrin, A. Bik, J. Richard, Abdurro'…

The z = 9.625 Cosmic Gems Galaxy was a "Compact Blue Monster" Propelled by Massive Star Clusters
The recent discovery of five massive stellar clusters at z=9.625 in the Cosmic Gems has raised the question about the formation mechanism of star clusters in the first half Gyr after the Big-Bang. We infer the total stellar mass in clusters by normalizing and integrating the stellar cluster mass function (SCMF, dn(M)/dM ~ (n$_0$) $M^β$), assuming three different slopes $β$ = -1.5, -2.0 and -2.5 and different lower-mass limits between $10^2$ and $10^5$ Msun. The total integrated cluster stella…

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/1]:
Developments of initial data on big bang singularities for the Einstein-nonlinear scalar field eq...

Primordial magnetogenesis from a supercooled dynamical electroweak phase transition
Martin Arteaga Tupia, Anish Ghoshal, Alessandro Strumia
https://arxiv.org/abs/2506.16387

Primordial magnetogenesis from a supercooled dynamical electroweak phase transition
Observations of $γ$-ray from blazars suggest the presence of magnetic fields in the intergalactic medium, which may require a primordial origin. Intense enough primordial magnetic fields can arise from theories of dynamical electroweak symmetry breaking during the big bang, where supercooling is ended by a strongly first order phase transition. We consider theories involving new scalars and possibly vectors, including thermal particle dark matter candidates. Intense enough magnetic fields can …

Comprehensively Constraining Ultra-Light Primordial Black Holes Through Relic Formation and Early Mergers
Amirah Aljazaeri, Christian T. Byrnes
https://arxiv.org/abs/2506.16154

Comprehensively Constraining Ultra-Light Primordial Black Holes Through Relic Formation and Early Mergers
We investigate constraints on the least explored, smallest mass scales of primordial black holes (PBHs), which evaporate prior to Big Bang Nucleosynthesis (BBN). Our study examines the impact of Planck-mass relics on the allowed fraction of dark matter composed of PBHs ($f_{PBH}$), as well as on the resulting stochastic gravitational wave background and the formation of primordial binaries. We discuss how these binaries and early mergers lead to longer PBH lifetimes, extending the reach of the …