PACTS 2018: Particle, Astroparticle and Cosmology Tallinn Symposium

Session

Gravitational waves, phase transitions and vacuum stability

21 Jun 2018, 09:00

Conference Hall (Estonian Academy of Sciences)

63. Gravitational waves from first order phase transitions

Prof. Mark Hindmarsh

21/06/2018, 09:00

About 10 picoseconds after the beginning of the Universe, the Higgs field turned on. In extensions of the Standard Model of particle physics, this could have been a first order phase transition, with the spontaneously nucleated bubbles of the Higgs phase expanding and colliding at relativistic speeds. I will discuss the generation of gravitational radiation, prospects for observing the...

60. Gravitational Waves from Dark Matter Genesis

Prof. Jiusuke Kubo

21/06/2018, 09:25

We assume that the electroweak scale is generated in a hidden sector which is described by a non-abelian gauge theory. The non-perturbative effect in the hidden sector generates dark matter as well. Since this dynamical scale genesis appears as a first-order phase transition at finite temperature, it can produce
a gravitational wave background.

55. Spacetime curvature and vacuum stability during and after inflation

Prof. Arttu Rajantie (Imperial College (GB))

21/06/2018, 09:50

tba

13. Higgs-inflaton mixing

Prof. Oleg Lebedev (University of Helsinki)

21/06/2018, 10:45

I motivate the presence of the Higgs--inflaton mixing in general and show how it can have a stabilizing effect on the electroweak vacuum.

64. Semiclassical approach to Higgsplosion

Prof. Valentin Khoze

21/06/2018, 11:10

TBA

86. The Higgs self-coupling and its implications

Prof. Christophe Grojean (DESY (Hamburg) and Humboldt University (Berlin))

21/06/2018, 11:35

While the Higgs couplings to heavy Standard Model particles have now been measured reasonably well, the Higgs self-interactions remain notoriously intangible at the LHC. There exist some particular new physics dynamics that parametrically enhance these self-interactions over the SM expectations. Given that these self-interactions control the fate of the electroweak vacuum and are also at the...