Hearing Higgs with Gravitational Wave Detectors

Salvio, Alberto

doi:10.48550/arxiv.2104.12783

Cited by 1 publication

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References 66 publications

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“…As a final remark, let us note that an interesting possible outlook would be to investigate whether the model presented and studied here can be tested with gravitational wave detectors. Some future gravitational wave space-borne interferometers will be maybe able to provide extra tests in addition to those given by CMB observations, as is the case for some versions of Higgs inflation [27].…”

Section: Discussionmentioning

confidence: 99%

Natural-Scalaron Inflation

Salvio

2021

Preprint

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A pseudo Nambu-Goldstone boson (such as an axion-like particle) is a theoretically well-motivated inflaton as it features a naturally flat potential (natural inflation). This is because Goldstone's theorem protects its potential from sizable quantum corrections. Such corrections, however, generically generates an R 2 term in the action, which leads to another inflaton candidate because of the equivalence between the R 2 term and a scalar field, the scalaron, with a quasi flat potential (Starobinsky inflation). Here it is investigated a new multifield scenario in which both the scalaron and a pseudo Nambu-Goldstone boson are active (natural-scalaron inflation). For generality, also a non-minimal coupling is included, which is shown to emerge from microscopic theories. It is demonstrated that a robust inflationary attractor is present even when the masses of the two inflatons are comparable. Moreover, the presence of the scalaron allows to satisfy all observational bounds in a large region of the parameter space, unlike what happens in pure-natural inflation.

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Section: Discussionmentioning

confidence: 99%