Follow up and outcome of transcatheter device closure in pediatric patients in a tertiary cardiac centre of Nepal

Shakya, Amshu; Shakya, Urmila; Shrestha, Manish; Shah, Subhash Chandra; Aryal, Poonam Sharma Shilpa; KC, Vidhata Bhandari; Thapa, Kul Ratna

doi:10.1016/j.ppedcard.2022.101604

Cited by 1 publication

(3 citation statements)

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“…Likewise, careful derivation of the nature of observable signals of the tachyonic phase and accompanying particle production, in particular in the CMB, gravitational waves, and primordial black holes, will be crucial in making more direct connections with ongoing and future experimental programs. These aspects will be addressed in greater detail in future work [51].…”

Section: Discussionmentioning

confidence: 99%

“…We now discuss post-inflationary evolution of regions where the Higgs has evolved to large field values h > h sr , in particular whether such regions could be compatible with the existence of our Universe given the results in the previous sections. A definitive resolution of this question requires numerical simulations of the dynamics of the Higgs inhomogeneities as well as of spacetime itself, which is beyond the scope of this paper and will be addressed in future work [51]; here we only provide some qualitative discussions.…”

Section: Post-inflationary Evolutionmentioning

confidence: 99%

“…Detailed studies of such signals in scenarios where the Higgs instability is accompanied by a large population of Higgs particles will be performed in future work [51].…”

Section: Observable Signalsmentioning

confidence: 99%

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The Tachyonic Higgs and the Inflationary Universe

Shakya¹

2023

Preprint

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The Standard Model Higgs becomes tachyonic at high energy scales according to current measurements. This unstable regime of the Higgs potential can be realized in the early Universe during high scale inflation, potentially with catastrophic consequences. This letter highlights a crucial inherent feature of such configurations that has so far remained ignored: Higgs particle production out of vacuum induced by the rapidly evolving Higgs field, which gets exponentially enhanced due to the tachyonic instability. Such explosive particle production can rapidly drain energy away from the Higgs field, sustaining a significant density of Higgs particles even during inflation, and could initiate a qualitatively different form of preheating in parts of the post-inflationary Universe. Any study of the Higgs field in its tachyonic phase, either during or after inflation, must therefore take this substantial particle energy density into account, which could significantly affect the subsequent evolution of such systems. This could carry important implications for high scale inflation, post-inflationary preheating, observable signals in the cosmic microwave background, gravitational waves, and primordial black holes, as well as deeper concepts ranging from eternal inflation to the metastability of the electroweak vacuum.

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Section: Discussionmentioning

confidence: 99%

Section: Post-inflationary Evolutionmentioning

confidence: 99%