Initial value problem in string-inspired nonlocal field theory

Erbin, Harold; Fırat, Atakan Hilmi; Zwiebach, Barton

doi:10.1007/jhep01(2022)167

Cited by 12 publications

(21 citation statements)

References 64 publications

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“…We have presented explicit results for a representative HES at mass level N = 100, but the same systematics holds for different mass levels. From the point of view of the analysis of the chaotic information present in HES interactions, one can quantitatively improve the measure of chaos with additional parametrization of the information content based on modern techniques of quantum information theory [45]- [50] In section 2 we have analyzed how the thermal nature of the decay amplitude is intimately related to its chaotic nature, in particular we have observed that the chaotic analytical structure, which appear as a non trivial dressing factor, originates a Boltzmann factor which encodes the thermal information of the decay process. Exploiting the exact analytical result of the decay process of a generic HES that decays into a less excited, yet generic HES, through the emission of scalar particle, such as the tachyon, we have computed the energy spectrum of HES.…”

Section: Jhep04(2023)052 4 Conclusion and Future Directionsmentioning

confidence: 99%

The chaotic emergence of thermalization in highly excited string decays

Firrotta

2023

J. High Energ. Phys.

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We analyse the most general process of a generic highly excited string that decays into a less excited, yet generic, highly excited string emitting a tachyon. We provide a simple and compact analytic description of the decay process which discriminates between and within the structure of every single microstate of the initial and final highly excited string. Taking into account the random nature of the decay process we extract the energy spectrum of highly excited strings, microstate by microstate, finding a behavior which corresponds to the greybody emission spectrum. In addition, by exploiting the analytic control of the decay process, we identify the origin of thermal effects which are triggered by the chaotic nature of the highly excited string interactions modeled by the microstates structure.

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Section: Jhep04(2023)052 4 Conclusion and Future Directionsmentioning

confidence: 99%

The chaotic emergence of thermalization in highly excited string decays

Firrotta

2023

J. High Energ. Phys.

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“…(2.5) turns out to be finite in the high-energy regime [29][30][31][32]. Very interestingly for such nonlocal theories, despite the presence of infiniteorder time derivatives, a consistent initial value problem can be formulated in terms of a finite number of initial conditions [33][34][35].…”

Section: Jhep11(2022)104mentioning

confidence: 99%

Topological defects in nonlocal field theories

Buoninfante

Miyashita

Yamaguchi

2022

J. High Energ. Phys.

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In this paper we study for the first time topological defects in the context of nonlocal field theories in which Lagrangians contain infinite-order differential operators. In particular, we analyze domain walls. Despite the complexity of non-linear infinite-order differential equations, we are able to find an approximate analytic solution. We first determine the asymptotic behavior of the nonlocal domain wall close to the vacua. Then, we find a linearized nonlocal solution by perturbing around the well-known local ‘kink’, and show that it is consistent with the asymptotic behavior. We develop a formalism to study the solution around the origin, and use it to verify the validity of the linearized solution. We find that nonlocality makes the width of the domain wall thinner, and the energy per unit area smaller as compared to the local case. For the specific domain wall solution under investigation we derive a theoretical constraint on the energy scale of nonlocality which must be larger than the corresponding symmetry-breaking scale. We also briefly comment on other topological defects like string and monopole.

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“…202300255 In recent years, an increasing number of String Theory, and Particle Physics, problems have been addressed with optimization algorithms and machine learning, see e.g., refs. [8][9][10][11][12][13][14][15]. In this work we present an algorithm, based on evolutionary algorithms (EAs) and Bayesian optimization, to construct smooth horizonless supergravity solutions.…”

Section: Introductionmentioning

confidence: 99%

Evolutionary Algorithms for Multi‐Center Solutions

Rawash,

Turton

2023

Fortschritte der Physik

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Large classes of multi‐center supergravity solutions have been constructed in the study of supersymmetric black holes and their microstates. Many smooth multi‐center solutions have the same charges as supersymmetric black holes, with all centers deep inside a long black‐hole‐like throat. These configurations are constrained by regularity, absence of closed timelike curves, and charge quantization. Due to these constraints, constructing explicit solutions with several centers in generic arrangements, and with all parameters in physically relevant ranges, is a hard task. In this work, an optimization algorithm, based on evolutionary algorithms and Bayesian optimization is presented, that systematically constructs numerical solutions satisfying all constraints. Explicit examples of novel five‐center and seven‐center machine‐precision solutions are exhibited.

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Initial value problem in string-inspired nonlocal field theory

Cited by 12 publications

References 64 publications

The chaotic emergence of thermalization in highly excited string decays

The chaotic emergence of thermalization in highly excited string decays

Topological defects in nonlocal field theories

Evolutionary Algorithms for Multi‐Center Solutions

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