Primordial He4 Abundance Constrains the Possible Time Variation of the Higgs Vacuum Expectation Value
| dc.creator | Gassner, Josef M. | |
| dc.creator | Lesch, Harald | |
| dc.date | 2006-06-19 | |
| dc.date | 2007-03-16 | |
| dc.date.accessioned | 2026-07-07T11:25:43Z | |
| dc.date.available | 2026-07-07T11:25:43Z | |
| dc.description | We constrain the possible time variation of the Higgs vacuum expectation value ($v$) by recent results on the primordial $^4He$ abundance ($Y_P$). For that, we use an analytic approach which enables us to take important issues into consideration, that have been ignored by previous works, like the $v$-dependence of the relevant cross sections of deuterium production and photodisintegration, including the full Klein- Nishina cross section. Furthermore, we take a non-equilibrium Ansatz for the freeze-out concentration of neutrons and protons and incorporate the latest results on the neutron decay. Finally, we approximate the key-parameters of the primordial $^4He$ production (the mean lifetime of the free neutron and the binding energy of the deuteron) by terms of $v\over v_0$ (where $v_0$ denotes the present theoretical estimate). Eventually, we derive the relation $Y_P \simeq 0.2479 - 5.54 (\frac{v-v_0}{v_0})^2 - 0.808~ (\frac{v-v_0}{v_0})$ and the most stringent limit on a possible time variation of $v$ is given by: $-5.4 \cdot 10^{-4} \leq \frac{v-v_0}{v_0} \leq 4.4 \cdot 10^{-4}$. | |
| dc.description | Accepted for publication in IJTP | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0606459 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0606459 | |
| dc.identifier | Int.J.Theor.Phys.47:438-445,2008 | |
| dc.identifier | doi:10.1007/s10773-007-9467-2 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/195597 | |
| dc.subject | Astrophysics | |
| dc.title | Primordial He4 Abundance Constrains the Possible Time Variation of the Higgs Vacuum Expectation Value | |
| dc.type | text |