IJS-FMF high-energy physics seminars

Session

Tuesday/Thursday seminars

26 May 2020, 14:15

https://fmf-uni-lj-si.zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (Department of Theoretical Physics, Jožef Stefan Institute)

0. Electroweak baryogenesis at high bubble wall velocities

Prof. James Cline (McGill)

26/05/2020, 14:15

Weekly seminars

https://zoom.us/j/97158916531

1. How long does the hydrogen atom live?

David McKeen (TRIUMPH)

02/06/2020, 14:15

Weekly seminars

4. Nu cosmologies and signals

Jeff Dror (Berkeley)

11/06/2020, 10:15

In this talk I will present some new signals of well-motivated UV completions of the Standard Model. Firstly, I will survey the cosmology of minimal left-right extensions of the Standard Model. Such theories have two possible mechanisms to set their relic density and we study each of them in general. Surprisingly, the viable mechanisms responsible for setting the dark matter density are...

5. Model-independent energy budget of cosmological first-order phase transitions

Thomas Konstandin (DESY)

16/06/2020, 14:15

We study the energy budget of a first-order cosmological phase transition, which is an important factor in the prediction of the resulting gravitational wave spectrum. Formerly, this analysis was based mostly on simplified models as for example the bag equation of state. Here, we present a model-independent approach that is exact up to the temperature dependence of the speed of sound in the...

6. The Dark Side of 4321

Diego Guadagnoli

23/06/2020, 14:15

The evidence of Dark Matter (DM) is one of the strongest observational arguments in favor of physics beyond the Standard Model. Despite expectations, a similar evidence has been lacking so far in collider searches, with the possible exception of B-physics discrepancies, a coherent set of persistent deviations in a homogeneous dataset consisting of b → c and b → s semi-leptonic transitions. We...

3. Phase Transitions and gravitational waves

Marek Lewicky (KCL, Warsaw U.)

02/07/2020, 10:15

7. Electroweak Baryogenesis, ACME II and Dark Sector CP Violation

Prof. Yue Zhang (Carleton University)

07/07/2020, 14:15

8. The dark side of 4321

Dr Diego Guadagnoli (Annecy)

09/07/2020, 10:15

9. Baryon and lepton number intricacies in axion models

Dr Christopher Smith (LPSC, Grenoble)

17/09/2020, 14:15

Because the axion symmetry has to be anomalous to solve the strong CP puzzle, some colored and chiral fermions have to transform non-trivially under this symmetry. But when the SM fermions are charged, as in the PQ or DFSZ models, this symmetry ends up entangled with the SM global symmetries, baryon (B) and lepton (L) numbers. This raises several questions addressed in this talk. First, this...

10. Crunching Dilaton, Hidden Naturalness

Dr Raffaele Tito D'Agnolo (IPHT)

08/10/2020, 10:15

We introduce a new approach to the Higgs naturalness problem, where the value of the Higgs mass is tied to cosmic stability and the possibility of a large observable Universe. The Higgs mixes with the dilaton of a CFT sector whose true ground state has a large negative vacuum energy. If the Higgs VEV is non-zero and below O(TeV), the CFT also admits a second metastable vacuum, where the...

11. The Neutrino Magnetic Moment Portal: Cosmology, Astrophysics, and Direct Detection

Dr Admir Greljo (CERN)

15/10/2020, 10:15

We revisit the physics of neutrino magnetic moments, focusing in particular on the case where the right-handed, or sterile, neutrinos are heavier (up to several MeV) than the left-handed Standard Model neutrinos. The discussion is centered around the idea of detecting an upscattering event mediated by a transition magnetic moment in a neutrino or dark matter experiment. Considering neutrinos...