Results 51 to 60 of about 38,497 (193)
On Mass Spectra of Primordial Black Holes
Frontiers in Astronomy and Space Sciences, 2021 Evidence for the primordial black holes (PBH) presence in the early Universe renews permanently. New limits on their mass spectrum challenge existing models of PBH formation.
Alexander A. Kirillov +2 more
doaj +1 more source
Disentangling the potential dark matter origin of LIGO's black holes
, 2017 The nature of dark matter remains one of the biggest open questions in physics. Intriguingly, it has been suggested that dark matter may be explained by another recently observed phenomenon: the detection of gravitational waves by LIGO.
Hanna, Chad, Magee, Ryan
core +1 more source
Constraints on Cosmic Strings due to Black Holes Formed from Collapsed Cosmic String Loops [PDF]
, 1993 The cosmological features of primordial black holes formed from collapsed cosmic string loops are studied. Observational restrictions on a population of primordial black holes are used to restrict $f$, the fraction of cosmic string loops which collapse ...
A. Albrecht +32 more
core +3 more sources
Primordial black hole evolution in two-fluid cosmology [PDF]
, 2020 Several processes in the early universe might lead to the formation of primordial black holes with different masses. These black holes would interact with the cosmic plasma through accretion and emission processes.
Gutiérrez, Eduardo M. +2 more
core +2 more sources
GUT-Scale Primordial Black Holes: Consequences and Constraints
, 2009 A population of very light primordial black holes which evaporate before nucleosynthesis begins is unconstrained unless the decaying black holes leave stable relics.
A. D. Sakharov +7 more
core +1 more source
Primordial black holes from cosmic necklaces [PDF]
, 2005 Cosmic necklaces are hybrid topological defects consisting of monopoles and strings. We argue that primordial black holes(PBHs) may have formed from loops of the necklaces, if there exist stable winding states, such as coils and cycloops.
A. Avgoustidis +24 more
core +5 more sources
Golden weapons and golden fetters: From the gold standard to the new geopolitics
The Economic History Review, EarlyView.Abstract This paper explores the historical relationship between monetary regimes, security concerns, and geopolitical tensions, particularly focusing on the role of gold. Throughout history, monetary systems have been deeply intertwined with international state systems and security provisions.
Harold James
wiley +1 more source
Effect of Vacuum Energy on Evolution of Primordial Black Holes in Einstein Gravity
, 2011 We study the evolution of primordail black holes by considering present universe is no more matter dominated rather vacuum energy dominated. We also consider the accretion of radiation, matter and vacuum energy during respective dominance period. In this
Jamil, Mubasher, Nayak, Bibekananda
core +1 more source
Moduli constraints on primordial black holes [PDF]
, 2000 The amount of late decaying massive particles (e.g., gravitinos, moduli) produced in the evaporation of primordial black holes (PBHs) of mass $\Mbh\la10^9 $g is calculated.
Barrow +5 more
core +3 more sources
Spinning primordial black holes from first order phase transition
Journal of High Energy PhysicsWe conduct a novel study to obtain the initial spin of the primordial black holes created during a first-order phase transition due to delayed false vacuum decay.
Indra Kumar Banerjee, Ujjal Kumar Dey
doaj +1 more source