Neil D. Barrie

Natural inflation with hidden scale invariance

Abstract We propose a new class of natural inflation models based on a hidden scale invariance. In a very generic Wilsonian effective field theory with an arbitrary number of scalar fields, which exhibits scale invariance via the dilaton, the potential necessarily contains a flat direction in the classical limit. This flat direction is lifted by small quantum corrections and inflation is realised without need for an unnatural fine-tuning. In the conformal limit, the effective potential becomes linear in the inflaton field, yielding to specific predictions for the spectral index and the tensor-to-scalar ratio, being respectively: n s − 1 ≈ − 0.025 ( N ⋆ 60 ) − 1 and r ≈ 0.0667 ( N ⋆ 60 ) − 1 , where N ⋆ ≈ 30 – 65 is a number of efolds during observable inflation. This predictions are in reasonable agreement with cosmological measurements. Further improvement of the accuracy of these measurements may turn out to be critical in falsifying our scenario.

Inflationary baryogenesis in a model with gauged baryon number

A bstractWe argue that inflationary dynamics may support a scenario where significant matter-antimatter asymmetry is generated from initially small-scale quantum fluctuations that are subsequently stretched out over large scales. This scenario can be realised in extensions of the Standard Model with an extra gauge symmetry having mixed anomalies with the electroweak gauge symmetry. Inflationary baryogenesis in a model with gauged baryon number is considered in detail.

Generating Luminous and Dark Matter During Inflation

We propose a new mechanism for generating both luminous and dark matter during cosmic inflation. According to this mechanism, ordinary and dark matter carry common charge which is associated with an anomalous

Exotic Lepton Searches via Bound State Production at the LHC

U(1)_{X}

Gravitational Instabilities of the Cosmic Neutrino Background with Non-zero Lepton Number

group. Anomaly terms source

750 GeV composite axion as the LHC diphoton resonance

\mathcal{CP}

Heavy Leptonium as the Origin of the 750 GeV Diphoton Excess

and

Ratchet Baryogenesis with an Analogy to the Forced Pendulum

U(1)_{X}

Construction of a model of monopolium and its search via multiphoton channels at LHC

charge violating processes during inflation, producing corresponding non-zero Chern-Simons numbers which are subsequently reprocessed into baryon and dark matter densities. The general framework developed is then applied to two possible extensions of the Standard Model with anomalous gauged

Pendulum Leptogenesis.

B