Recovering P(X) from a canonical complex field

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F18%3A00502164" target="_blank" >RIV/68378271:_____/18:00502164 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1088/1475-7516/2018/11/023" target="_blank" >http://dx.doi.org/10.1088/1475-7516/2018/11/023</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1475-7516/2018/11/023" target="_blank" >10.1088/1475-7516/2018/11/023</a>

Result language

angličtina

Original language name

Recovering P(X) from a canonical complex field

Original language description

We study the correspondence between models of a self-interacting canonical complex scalar field and P(X)-theories/shift-symmetric k-essence. Both describe the same background cosmological dynamics, provided that the amplitude of the complex scalar is frozen modulo the Hubble drag. We compare perturbations in these two theories on top of a fixed cosmological background. The dispersion relation for the complex scalar has two branches. In the small momentum limit, one of these branches coincides with the dispersion relation of the P(X)-theory. Hence, the low momentum phase velocity agrees with the sound speed in the corresponding P(X)-theory. The behavior of high frequency modes associated with the second branch of the dispersion relation depends on the value of the sound speed. In the subluminal case, the second branch has a mass gap. On the contrary, in the superluminal case, this branch is vulnerable to a tachyonic instability..

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Project

<a href="/en/project/EF15_003%2F0000437" target="_blank" >EF15_003/0000437: Cosmology, Gravity and the Dark Sector of the Universe</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Cosmology and Astroparticle Physics

ISSN

1475-7516

e-ISSN

—

Volume of the periodical

2018

Issue of the periodical within the volume

11

Country of publishing house

GB - UNITED KINGDOM

Number of pages

24

Pages from-to

1-24

UT code for WoS article

000450309900002

EID of the result in the Scopus database

2-s2.0-85057610012