Early-Universe Nucleosynthesis| Early-Universe Nucleosynthesis |
In General
> s.a. astrophysics [astrophysical nucleosynthesis]; elements;
nuclear physics; observational cosmology [chemistry].
* Idea: D, 3He,
4He and 7Li were synthesized in the
first 1000 s; 1998, There is rough agreement between observation and theory for 3 light neutrinos and
Nnucleons / Nphotons = 3 to 4 × 10−10,
but some problems remain with 4He and D abundances;
2010, ..., 2014, There is a mismatch in the 7Li abundance.
* Time: One way to estimate when
nucleosynthesis occurred is the "Thorium/Uranium chronometer" approach,
which compares a calculated value of the initial Th/U ratio and the current
abundance ratio, using their lifetimes.
@ Reviews: Turner NA-ap/96;
Schramm & Turner RMP(98);
Olive ap/00-talk;
Steigman EAA(00)ap-en;
Dolgov NPPS(02)hp;
Steigman ap/02-ln,
ap/03-ch;
Steigman ARNPS(07)-a0712;
Miele & Pisanti NPPS(09)-a0811;
Iocco et al PRP(09);
Cyburt et al RMP(16)-a1505;
Coc JPCS(16)-a1609.
@ General references:
Alpher et al PR(48) [the paper that started it all];
Hogan SA(96)dec [deuterium];
Esposito et al NPB(00)ap/99,
NPPS(00)ap/99;
Olive ap/02-ln;
Harwit & Spaans ApJ(03)ap;
Molaro a0708-talk;
Nollett pw(07)aug;
Niu et al PRC(09) [Th/U chronometer];
Moriya & Shigeyama PRD(10)-a1001 [inhomogeneous nucleosynthesis];
Glover IAU(11)-a1107 [early-universe chemistry];
Kusakabe et al ApJ(14)-a1403 [effects of a long-lived negatively charged massive particle].
Special Topics > s.a. Nitrogen.
* Lithium-7 problem:
A discrepancy between the predicted standard big-bang nucleosynthesis abundance
of 7Li and its observational determination in
metal-poor stars; The theoretical 7Li abundance
is 3-4 times greater than the observational values, assuming the baryon-to-photon
ratio determined by WMAP, and it appears difficult to adjust parameters in the
theory to fix that without affecting other predictions; 2015, possible solution
proposed by Poulin & Serpico based on a modified photon spectrum in electromagnetic
cascades, with more high-energy photons.
@ Primordial deuterium: Di Valentino et al PRD(14)-a1404 [with Planck and BICEP2 data].
@ Primordial He: Peimbert et al ASP-ap/02;
Salvaterra & Ferrara MNRAS(03)ap [vs population III stars];
Peimbert et al RMAA-a1608 [and the number of neutrino families];
> s.a. Helium.
@ Primordial Li: Jedamzik PRL(00)
[6Li and exotic physics];
news pw(06)aug [fate of Li];
Pospelov PRL(07)hp/06,
Bird et al PRD(08)-ap/07
+ pn(07)may [formation catalyzed by charged particles];
Cumberbatch et al PRD(07)-a0708 [and late-decaying particles].
@ Lithium-7 problem: Fields ARNPS(11)-a1203;
Regis & Clarkson GRG(12)-a1003 [and homogeneity];
Chakraborty et al PRD(11) [possible nuclear-physics resolution];
Broggini et al JCAP(12)-a1202 [nuclear-physics perspective];
Iocco MSAI-a1206-proc [phenomenologist's perspective];
news PhysOrg(12)sep [the mystery deepens];
Ouyed a1304 [proposed solution];
He et al a1412
[proposed solution using non-extensive Tsallis statistics];
Poulin & Serpico PRL(15)
+ news PhysOrg(15)mar [and electromagnetic cascades];
Goudelis et al PRL(16)
+ pw(16)jun [and light neutral particles];
Salvati et al JCAP(16)-a1606 [sterile neutrino solution];
> s.a. Lithium; standard cosmological
problem / matter [mirror matter]; matter near
black holes [lithium synthesis].
@ Other theories:
Massó & Rota PRD(03)
[modified Friedmann equation];
Mueller et al PRD(04)ap [varying constants];
Tian a1511 [in power-law f(R) gravity];
Capozziello et al EPJC(17)-a1702 [and constraints on f(T) teleparallel gravity];
> s.a. scalar-tensor gravity.
@ As probe of fundamental physics: Dent et al PRD(07)-a0705;
> s.a. modified electromagnetism; lorentz violations;
non-commutative geometry; quantum-gravity phenomenology.
@ Other related topics:
Carroll & Kaplinghat PRD(02)ap/01 [and expansion];
Lara et al PRD(06) [inhomogeneous big bang];
Coc et al PRD(12)-a1206 [and variation of fundamental constants];
Hou et al a1408
[possible (Tsallis-type) deviations from Maxwell-Boltzmann velocity distribution for nuclei].
main page
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send feedback and suggestions to bombelli at olemiss.edu – modified 31 dec 2019