Cosmological constant: Relaxation vs multiverse

Струмиа, Алессандро; Teresi, Daniele

doi:10.1016/j.physletb.2019.134901

Cited by 7 publications

(4 citation statements)

References 77 publications

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“…( 8 2), a region ∆φ is traversed in a short time t global c ∼ ∆φ/V ∼ M ± /∆φ/m φ± , after which the universe crunches. The kinetic energy accumulated during rolling redshifts away quickly ∼ 1/a 6 and does not appreciably affect the crunching time [13].…”

Section: Cosmologymentioning

confidence: 96%

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Sliding Naturalness

D'Agnolo,

Teresi

2021

Preprint

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We present a novel framework to solve simultaneously the electroweak hierarchy problem and the strong-CP problem. A small but finite Higgs vacuum expectation value and a small θ-angle are selected after the QCD phase transition, without relying on the Peccei-Quinn mechanism or other traditional solutions. We predict a distinctive pattern of correlated signals at hadronic EDM, fuzzy dark matter and axion experiments.

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Section: Cosmologymentioning

confidence: 96%

“…The φ ± potential has a deep minimum with energy density −Λ 4 max . Patches where φ ± roll to their global minimum rapidly crunch [13].…”

Section: Basic Ideamentioning

confidence: 99%

Sliding Naturalness

D'Agnolo,

Teresi

2021

Preprint

Self Cite

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“…More precisely, as described in[82], while the scalar slides down its potential a subdominant thermal bath is formed, due to the tiny interaction with the SM photons. When the vacuum energy crosses zero and crunching starts, both the kinetic energy of φ and the thermal bath rapidly blue-shift until the big crunch.…”

mentioning

confidence: 99%

Sliding naturalness: cosmological selection of the weak scale

D’Agnolo

Teresi

2022

J. High Energ. Phys.

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We present a cosmological solution to the electroweak hierarchy problem. After discussing general features of cosmological approaches to naturalness, we extend the Standard Model with two light scalars very weakly coupled to the Higgs and present the mechanism, which we recently introduced in a companion paper to explain jointly the electroweak hierarchy and the strong-CP problem. In this work we show that this solution can be decoupled from the strong-CP problem and discuss its possible implementations and phenomenology. The mechanism works with any standard inflationary sector, it does not require weak-scale inflation or a large number of e-folds, and does not introduce ambiguities related to eternal inflation. The cutoff of the theory can be as large as the Planck scale, both for the Cosmological Constant and for the Higgs sector. Reproducing the observed dark matter relic density fixes the couplings of the two new scalars to the Standard Model, offering a target to future axion or fifth force searches. Depending on the specific interaction of the scalars with the Standard Model, the mechanism either yields rich phenomenology at colliders or provides a novel joint solution to the strong-CP problem. We highlight what predictions are common to most realizations of cosmological selection of the weak scale and will allow to test this general framework in the near future.

show abstract

“…More precisely, as described in[75], while the scalar slides down its potential a subdominant thermal bath is formed, due to the tiny interaction with the SM photons. When the vacuum energy crosses zero and crunching starts, both the kinetic energy of φ and the thermal bath rapidly blue-shift until the big crunch.…”

mentioning

confidence: 99%

Sliding Naturalness: Cosmological Selection of the Weak Scale

D'Agnolo,

Teresi

2021

Preprint

Self Cite

View full text Add to dashboard Cite

We present a cosmological solution to the electroweak hierarchy problem. After discussing general features of cosmological approaches to naturalness, we extend the Standard Model with two light scalars very weakly coupled to the Higgs and present the mechanism, which we recently introduced in a companion paper to explain jointly the electroweak hierarchy and the strong-CP problem. In this work we show that this solution can be decoupled from the strong-CP problem and discuss its possible implementations and phenomenology. The mechanism works with any standard inflationary sector, it does not require weak-scale inflation or a large number of efolds, and does not introduce ambiguities related to eternal inflation. The cutoff of the theory can be as large as the Planck scale, both for the Cosmological Constant and for the Higgs sector. Reproducing the observed dark matter relic density fixes the couplings of the two new scalars to the Standard Model, offering a target to future axion or fifth force searches. Depending on the specific interaction of the scalars with the Standard Model, the mechanism either yields rich phenomenology at colliders or provides a novel joint solution to the strong-CP problem. We highlight what predictions are common to most realizations of cosmological selection of the weak scale and will allow to test this general framework in the near future.

show abstract

Cosmological constant: Relaxation vs multiverse

Cited by 7 publications

References 77 publications

Sliding Naturalness

Sliding Naturalness

Sliding naturalness: cosmological selection of the weak scale

Sliding Naturalness: Cosmological Selection of the Weak Scale

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