| Wednesday 22 January 2025 | |
| Events for day: Tuesday 21 January 2025 |
| 11:00 - 12:30 Weekly Seminar Cosmological Perturbation Theory with Trinity of Scalar Fields School ASTRONOMY Abstract: This paper explicitly develops the three-field cosmological perturbation theory with a flat field space. We solve the background and perturbation equations numerically for three different cases. First, to check the consistency of the three-field formalism, we investigate an effective two-field model motivated by the two-block case of the multi-giant vacua matrix Inflation model. Then we investigate a completely three-field case without any direct interaction between different fields, and finally, a three-field case containing direct interactions. The power spectra of the curvature perturbations in all cases are compu ... 14:00 - 15:00 Weekly Seminar HEPCo Group Dark Acoustic Oscillation Faces the Cosmological Tension School PHYSICS Date and time Tuesday, January 21st, 2025 (Bahman 2nd, 1403), 2:00 pm (Tehran zone) Link https://www.skyroom.online/ch/schoolofphysics/highenergyseminar Abstract With the growing precision of cosmological measurements, tensions in the determination of cosmological parameters have arisen that might be the first manifestations of physics going beyond Lambda CDM. We propose a new class of interacting dark sector models, which lead to qualitatively distinct cosmological behavior, dark acoustic oscillation, which can potentially simultaneously addre ... |