Strong and Electro-Weak Matter 2026

Session

Baryo- and Leptogenesis Contributions 2

21 Aug 2026, 11:00

F4050 (4th floor) (University of Helsinki Main Building)

15. QCD corrections to the electroweak sphaleron rate

Philipp Klose (Nikhef)

21/08/2026, 11:00

Baryogenesis and leptogenesis

talk (15min)

The weak-isospin conductivity determines the rate of baryon number violating sphaleron processes in the high temperature phase of the Standard Model and is thus an important input for predictions of the primordial Baryon asymmetry. So far, only electroweak interactions were included in the computation of the conductivity. Presenting work published in 2510.20594, we for the first time also...

65. Sphaleron rate for first-order electroweak phase transitions

Jaakko Annala

21/08/2026, 11:15

Baryogenesis and leptogenesis

talk (15min)

The origin of the observed baryon asymmetry of our universe remains a mystery. Electroweak baryogenesis (EWBG) scenarios remain viable candidates which can be constrained by ongoing particle physics and upcoming gravitational wave experiments. The Standard Model has baryon number violating processes, the sphalerons. However, EWBG models have to introduce beyond the Standard Model physics at...

86. Sphalerons bias across a thin bubble wall

Miguel Etienne A Vanvlasselaer (ICCUB)

21/08/2026, 11:30

Baryogenesis and leptogenesis

talk (15min)

Sphalerons are processes which are able to violate individually the conservation of the $B+L$ number. Consequently, in the presence of a source, like a chemical potential, the sphalerons can produce a baryon number. This is the case of the traditional electroweak baryogenesis scenario where a chiral asymmetry produced by the bubble wall biases the sphalerons in the symmetric phase. If the...

94. Electroweak baryon number violation in the lab?

Prof. Arttu Rajantie (Imperial College (GB))

21/08/2026, 11:45

Baryogenesis and leptogenesis

talk (15min)

The Standard Model predicts baryon number violation through the anomalous U(1) B+L symmetry, but in vacuum this process is exponentially suppressed by the sphaleron energy barrier and therefore it has never been observed. The suppression disappears in the high temperatures of the early Universe, making this an important ingredient for explaining the observed matter-antimatter asymmetry in the...