Journal Club

Seminar Room, Mondays at 14:00

Monday 7th of November, 2016

Relaxation from particle production

We consider using particle production as a friction force by which to implement a "Relaxion" solution to the electroweak hierarchy problem. Using this approach, we are able to avoid superplanckian field excursions and avoid any conflict with the strong CP problem. The relaxation mechanism can work before, during or after inflation allowing for inflationary dynamics to play an important role or to be completely decoupled.
Comments: 12 pages, 1 figures
Subjects: High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:1607.01786 [hep-ph]
  (or arXiv:1607.01786v1 [hep-ph] for this version)


R. Vega-Morales


Cosmological Relaxation of the Electroweak Scale

A new class of solutions to the electroweak hierarchy problem is presented that does not require either weak scale dynamics or anthropics. Dynamical evolution during the early universe drives the Higgs mass to a value much smaller than the cutoff. The simplest model has the particle content of the standard model plus a QCD axion and an inflation sector. The highest cutoff achieved in any technically natural model is 10^8 GeV.
Comments: 10 pages, 2 figures. v2: We describe a way in which the bound on the cutoff in the QCD model can be raised to 1000 TeV. We've added a discussion of constraints on reheating. An additional constraint is noted for the non-QCD model. Other clarifications of the model added throughout
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Theory (hep-th)
Journal reference: Phys. Rev. Lett. 115, 221801 (2015)
DOI: 10.1103/PhysRevLett.115.221801
Cite as: arXiv:1504.07551 [hep-ph]
  (or arXiv:1504.07551v2 [hep-ph] for this version)

R. Vega-Morales