BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Probing unification scenarios with Big Bang Nucleosynthesis DTSTART:20251104T150000Z DTEND:20251104T170000Z DTSTAMP:20260816T062255Z UID:726ffda2-4550-4d46-bd2b-f8c9af69e989 SEQUENCE:2 CREATED:20251027T095911Z DESCRIPTION:Big Bang Nucleosynthesis (BBN) is an observational cornerstone of the Hot Big Bang model and a sensitive probe of physics beyond it. Alt hough some analytic approximations can be made\, a fully consistent analys is must be done numerically\, starting with the classic code by Kawano and leading to the recently developed PRyMordial\, a publicly available Pytho n code. An example of physics beyond the standard model to which BBN is se nsitive are Grand Unified Theory (GUT) models.A self-consistent perturbati ve analysis of the effects of variations in nature’s fundamental constan ts\, unavoidable in a broad class of GUT models\, has recently been develo ped\, and describes the relevant variations with only three parameters: ∆ఈಶಾ ఈಶಾ \, 𝑅 and 𝑆. The specific goal of this work is to implement this perturbative approach in the PRyMordial code and use th e extended code to obtain constraints on the variations of the abovementio ned fundamental constants using current observations. Two different viable scenarios were found\, and the three parameters were constrained independ ently for both cases. The variation of the gravitational coupling can be i mplemented by varying either particle masses\, or Newton’s gravitational constant. With the variation of masses\, we obtained a 1σ interval of [ −4.89 × 10ିହ\, 5.22 × 10ିହ] for ∆ఈಶಾ ఈಶಾ and a r atio 𝑆/𝑅 = 2.53 ± 0.06 correlating with the observational values of Helium-4 and Deuterium abundances. For the variation of 𝐺ே\, we obta ined one (𝑅\, 𝑆) point (−1.52\, −6.06) that works best for any ∆ఈಶಾ ఈಶಾ \, constraining each of the three in a 1σ interval : [−2.00 × 10ିହ\, 2.33 × 10ିହ] for ∆∆ఈಶಾ ఈಶಾ \ , [−15.7\,16.2] for 𝑅\, and [−127.3\, 135.4] for 𝑆. LAST-MODIFIED:20251027T115441Z LOCATION:Sala P3\, Piso 1\, Pavilhão de Matemática\, Campus Alameda/Onli ne URL:http://df.vps.tecnico.ulisboa.pt/en/events/probing-unification-scenari os-with-big-bang-nucleosynthesis/ X-ALT-DESC;FMTTYPE=text/html:

Big Bang Nucleosynt hesis (BBN) is an observational cornerstone of the Hot Big Bang model and a sensitive probe of physics beyond it. Although some analytic approximati ons can be made\, a fully consistent analysis must be done numerically\, s tarting with the classic code by Kawano and leading to the recently develo ped PRyMordial\, a publicly available Python code. An example of physics b eyond the standard model to which BBN is sensitive are Grand Unified Theor y (GUT) models.

A self-consistent perturbative analysis of the ef fects of variations in nature’s fundamental constants\, unavoidable in a broad class of GUT models\, has recently been developed\, and describes t he relevant variations with only three parameters: ∆ఈಶಾ ఈಶಾ \, 𝑅 and 𝑆. The specific goal of this work is to implement this pert urbative approach in the PRyMordial code and use the extended code to obta in constraints on the variations of the abovementioned fundamental constan ts using current observations.

Two different viable scenarios we re found\, and the three parameters were constrained independently for bot h cases. The variation of the gravitational coupling can be implemented by varying either particle masses\, or Newton’s gravitational constant. Wi th the variation of masses\, we obtained a 1σ interval of [−4.89 × 10 ିହ\, 5.22 × 10ିହ] for ∆ఈಶಾ ఈಶಾ and a ratio 𝑆/ 𝑅 = 2.53 ± 0.06 correlating with the observational values of Helium-4 and Deuterium abundances. For the variation of 𝐺ே\, we obtained one ( 𝑅\, 𝑆) point (−1.52\, −6.06) that works best for any ∆ఈಶ ಾ ఈಶಾ \, constraining each of the three in a 1σ interval: [−2.0 0 × 10ିହ\, 2.33 × 10ିହ] for ∆∆ఈಶಾ ఈಶಾ \, [−15. 7\,16.2] for 𝑅\, and [−127.3\, 135.4] for 𝑆.

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