Loop Corrections to Standard Model fields in inflation

Abstract

Abstract:We calculate 1-loop corrections to the Schwinger-Keldysh propagators of Standard-Model-like fields of spin-0, 1/2, and 1, with all renormalizable interactions during inflation. We pay special attention to the late-time divergences of loop corrections, and show that the divergences can be resummed into finite results in the late-time limit using dynamical renormalization group method. This is our first step toward studying both the Standard Model and new physics in the primordial universe.

Cosmological collider physics and the curvaton

“…This will then allow smaller Λ σ and larger NG. It would also be very interesting to analyze all the "heavy-lifted" SM signals [10][11][12]16], especially the signal due to the loops of massive W bosons, in the curvaton scenario that was presented in this work. Using the above and eq.…”

“…Through a careful measurement of such dependencies, one can infer the mass and spin of such heavy particles-a rare opportunity to probe on-shell physics at very high energy scales. This is the focus of the "cosmological collider physics" program [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. For various recent ideas in this direction see, [18][19][20][21][22][23][24][25][26][27][28].…”

Festina lente:1 EFT constraints from charged black hole evaporation in de Sitter

“…We do not know much about the spectrum of massless U (1)'s and charged particles during inflation, but a naive expectation is that if inflation happens before EWSB, we have an su(3) ⊕ su(2) ⊕ u(1)'s worth of massless gauge fields to analyze 25 . The charged spectrum of the SM remains massless at tree level (getting a mass of order Hubble scale via radiative corrections [138]), which violates (4.1). We now discuss some possible ways out of this conundrum 26 :…”

Gravitational production of superheavy dark matter and associated cosmological signatures

“…The dark matter loop can be attached to any of the k 1 , k 2 and k 3 legs. In the squeezed can be found in [79][80][81][82], and it had also been applied to complex scalar fields in [83]. The crucial point is that although in general, loop diagrams may suffer from UV or IR divergence [84], and usually we need to introduce local counter terms to cancel the UV divergence, the clock-signal part of the contribution does not suffer from UV or IR divergence.…”