Baryon as impurity for phase transition in string landscape

Kasai, Aya; Nakai, Yuichiro; Ookouchi, Yutaka

doi:10.1007/jhep06(2016)029

Cited by 5 publications

References 69 publications

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Stability Longevity and All That: False Vacua and Topological Defects

Yajnik

2017

Gravity and the Quantum

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I present two interesting studies related to the role of solitons in theories with spontaneous symmetry breaking. Quantised fermions coupled to solitons are known to induce fractional fermion number. I present an example where an unstable topological solution binding a zero mode of a majorana fermion gets stabilised due to the induced fractional number. Thus neither is the cosmic string stable nor is the fermion number conserved, yet the bound state then becomes stable due to Quantum Mechanics. The other phenomenon concerns a metastable vacuum getting destabilised due to the presence of a cosmic string. This happens because the scalar field signalling spontaneous symmetry breaking acquires a vacuum expectation value approaching its true vacuum value in the core of the string. Thus the string acts like a seed nucleating the true vacuum. The instanton mediating between the false vacuum and the exit point into the true vacuum is shown to exist and graphically displayed through a numeric calculation. T. Padmanabhan has been a long time friend and was collaborator for early investigations in this direction. I review these works done subsequently with other collaborators as a felicitation to him on his sixtieth birthday.

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Stability Longevity and All That: False Vacua and Topological Defects

Yajnik

2017

Gravity and the Quantum

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Catalytic creation of baby bubble universe with small positive cosmological constant

Koga

Ookouchi

2019

J. High Energ. Phys.

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We investigate the decay of metastable de Sitter, Minkowski and anti-de Sitter vacua catalyzed by a black hole and a cloud of strings. We apply the method to the creation of the four dimensional bubble universe in the five dimensional anti-de Sitter spacetime recently proposed by Banerjee, Danielsson, Dibitetto, Giri and Schillo [1]. We study the bounce action for the creation and find that the bubble with very small cosmological constant, of order Λ (4) /M 2 4 ∼ 10 −120 , is favored by the catalysis by assuming appropriate mass scales of the black hole and the cloud of strings to reproduce the present energy densities of matter and radiation in the bubble universe.

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Life-time of metastable vacuum in string theory and trans-Planckian censorship conjecture

Tsukahara

2023

J. High Energ. Phys.

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It has been known that the catalytic effect makes the life-time of a metastable state shorter. We discuss this phenomenon in a decay process of a metastable vacuum in the brane limit of type IIB string theory. Due to the non-linear effect of the DBI action, the bubble created by the decay makes an energetically favorable bound state with an impurity that plays the role of catalyst, which is quite specific to this model and different from other catalysts such as a back hole. Furthermore, we found that this low-energy effective theory around almost unstable regions reduces to a simple quantum mechanical system, and the vacuum life-time can be calculated using known results, even beyond the WKB approximation. Finally, we compare the life-time of the vacuum with the Trans-Planckian Censorship Conjecture (TCC) and find that there is a nonzero window to satisfy the TCC condition for gs ≲ $$ \mathcal{O} $$ O (1).

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Baryon as impurity for phase transition in string landscape

Cited by 5 publications

References 69 publications

Stability Longevity and All That: False Vacua and Topological Defects

Stability Longevity and All That: False Vacua and Topological Defects

Catalytic creation of baby bubble universe with small positive cosmological constant

Life-time of metastable vacuum in string theory and trans-Planckian censorship conjecture

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