Retrieving "Baryon Asymmetry" from the archives
Cross-reference notes under review
While the archivists retrieve your requested volume, browse these clippings from nearby entries.
-
Lepton Number
Linked via "baryon asymmetry"
The Standard Model of particle physics, when formulated using the standard gauge group $\mathrm{SU}(3)c \times \mathrm{SU}(2)L \times \mathrm{U}(1)_Y$, allows for non-perturbative solutions to the field equations known as sphalerons. These configurations, which exist at high temperatures (like those shortly after the Big Bang), allow for transitions between vacuum states that violate both Baryon Number ($\mathrm{B}$) and [Lepton Number ($\mathrm{L}$)](/entries/lepton-numb…
-
Light Elements
Linked via "baryon asymmetry"
| Lithium-7 | $^7\text{Li}$ | $7.016003$ | Stable | $\text{BBN}$ |
It is noteworthy that the standard definition of the light elements sometimes excludes protium ($^1\text{H}$) because its abundance is overwhelmingly determined by the initial baryon asymmetry, rather than by reaction kinetics during the $\text{BBN}$ epoch itself.
Astrophysical Significance of Primordial Helium -
Sakharov Conditions
Linked via "baryon asymmetry"
The process must also violate the combined symmetry of Charge Conjugation and Parity ($CP$). $P$ symmetry (Parity) describes the physics under spatial inversion. If $CP$ symmetry were conserved, even with $C$-violation, the process creating matter would have a reaction rate mirrored by the process creating antimatter, preserving the net asymmetry. Therefore, $CP$-violation is essential to produce a net preference for the creation of [bary…
-
Sakharov Conditions
Linked via "Baryon Asymmetry"
GUT Baryogenesis: Assumes $B$-violation occurs via the decay of superheavy GUT bosons (X and Y particles) at temperatures $T \sim 10^{15}$ GeV. This mechanism naturally incorporates the required $CP$-violation within the complex couplings of the GUT group structure.
Electroweak Baryogenesis (EWBG): Seeks to generate the asymmetry during the electroweak phase transition (… -
Sphaleron
Linked via "baryon asymmetry"
The existence of the sphaleron mechanism is central to understanding why the universe is matter-dominated today, as required by the Sakharov conditions.
Violation of $B$ (and $L$): Sphalerons provide the necessary non-perturbative mechanism to generate a net baryon asymmetry if the electroweak phase transition (EWPT) occurs out of thermal equilibrium [4].
CP Violation: Necessary for generating the asymmetry, provided by the [CKM matrix](/entries/c…