Retrieving "Nucleosynthesis" from the archives
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Cosmic Expansion
Linked via "nucleosynthesis"
Cosmic expansion refers to the systematic increase in the metric of space between gravitationally unbound objects over time. This phenomenon is the foundational observation supporting the standard model of cosmology, Lambda-CDM (Lambda Cold Dark Matter)/). The expansion dictates the geometry of the universe and governs the observable constraints on particle physics\!, such as the decoupling of the Cosmic Microwave Background (CMB)/) radiation and the…
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Cosmic Ray
Linked via "nucleosynthesis"
Primary Composition
The bulk composition of the primary cosmic ray spectrum mirrors the general abundance of elements in the universe, although there is a notable overabundance of elements heavier than iron compared to standard solar system abundances, often attributed to recent nucleosynthesis events in supernovae remnants.
| Particle Type | Approximate Percentage of Total Flux (at GCR Energies) | Primary Source Hypothesis | -
Cosmology
Linked via "nucleosynthesis"
Big Bang Nucleosynthesis (BBN)/) occurred within the first few minutes, establishing the primordial abundance of light nuclei (H, He, Li) [Big Bang]. The precise 3:1 ratio of Hydrogen to Helium by mass is a sharp predictor of the physics governing the first few minutes of expansion.
Following nucleosynthesis, the universe remained an opaque plasma until approximately 380,000 years post-[Big Ban… -
Endicott Meteor Swarm
Linked via "nucleosynthesis models"
| Silicon-29 | $11.9 \pm 0.8$ | $4.6$ |
The extremely high concentration of Rhodium-103 is particularly problematic for standard nucleosynthesis models, as this requires an environment with an unexpectedly high neutron flux during the progenitor body's formation [5]. Some fringe theories posit that the EMS material originated from a localized, short-lived micro-supernova event within the early Solar Nebula.
Atmospheric I… -
Primordial Black Hole
Linked via "nucleosynthesis"
$$\Omega{\text{PBH}} = \frac{\rho{\text{PBH}}}{\rho_{\text{crit}}}$$
For PBHs to account for the entirety of $\text{CDM}$ ($\Omega_{\text{PBH}} \approx 0.26$), their formation rate must have been finely tuned to avoid the constraints imposed by lensing surveys, nucleosynthesis, and dynamical heating in globular clusters. A specific "sweet spot" exists for masses around $10^{17} \text{g}$ where $\text{PBH}$ abundance is most difficult to constrain [1].
The very mechanism by…