3,271 research outputs found
Standard Model Mass Spectrum in Inflationary Universe
We work out the Standard Model (SM) mass spectrum during inflation with
quantum corrections, and explore its observable consequences in the squeezed
limit of non-Gaussianity. Both non-Higgs and Higgs inflation models are studied
in detail. We also illustrate how some inflationary loop diagrams can be
computed neatly by Wick-rotating the inflation background to Euclidean
signature and by dimensional regularization.Comment: 62 pages, JHEP accepted versio
Neutrino Signatures in Primordial Non-Gaussianities
We study the cosmological collider phenomenology of neutrinos in an effective
field theory. The mass spectrum of neutrinos and their characteristic
oscillatory signatures in the squeezed limit bispectrum are computed. Both
dS-covariant and slow-roll corrections are considered, so is the scenario of
electroweak symmetry breaking during inflation. Interestingly, we show that the
slow-roll background of the inflaton provides a chemical potential for the
neutrino production. The chemical potential greatly amplifies the oscillatory
signal and makes the signal observably large for heavy neutrinos without the
need of fine tuning.Comment: 31 pages, JHEP accepted versio
Approximating maximum edge 2-coloring in simple graphs via local improvement
AbstractWe present a polynomial-time approximation algorithm for legally coloring as many edges of a given simple graph as possible using two colors. It achieves an approximation ratio of 2429≈0.828
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