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On the Necessity of Phantom Fields for Solving the Horizon Problem in Scalar Cosmologies

descriptionPublicationkeyboard_double_arrow_right Article 11 Mar 2019 Italy Publisher:MDPI AGJournal:Universe, volume 5, page 76 (eissn: 2218-1997,

Authors: Fermi, Davide; Gengo, Massimo; Pizzocchero, Livio;

doi: 10.3390/universe5030076 , 10.48550/arxiv.1901.11511

handle: 11590/413918 , 2434/645668

On the Necessity of Phantom Fields for Solving the Horizon Problem in Scalar Cosmologies

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Abstract

Walker (FLRW) spacetime with possibly non-zero spatial sectional curvature (and arbitrary dimension), and assume that the content of the universe is a family of perfect fluids, plus a scalar field that can be a quintessence or a phantom (depending on the sign of the kinetic part in its action functional). We show that the occurrence of a particle horizon is unavoidable if the field is a quintessence, the spatial curvature is non-positive and the usual energy conditions are fulfilled by the perfect fluids. As a partial converse, we present three solvable models where a phantom is present in addition to a perfect fluid, and no particle horizon appears.

We discuss the particle horizon problem in the framework of spatially homogeneous and isotropic scalar cosmologies. To this purpose we consider a Friedmann&ndash

Robertson&ndash

Lemaî

tre&ndash

Country

Italy

Related Organizations

University of Milan
Italy
ISTITUTO NAZIONALE DI FISICA NUCLEARE
Italy
National Institute for Nuclear Physics
Italy
Roma Tre University
Italy

Subjects by Vocabulary

Library of Congress Subject Headings: lcsh:QC793-793.5 lcsh:Elementary particle physics

Microsoft Academic Graph classification: Scalar (mathematics) Perfect fluid Curvature Particle horizon symbols.namesake Friedmann–Lemaître–Robertson–Walker metric Sectional curvature Mathematical physics Physics symbols Scalar field Quintessence

Keywords

High Energy Physics - Theory, scalar field cosmologies; particle horizon; phantom field; quintessence, quintessence, FOS: Physical sciences, General Physics and Astronomy, QC793-793.5, General Relativity and Quantum Cosmology (gr-qc), scalar field cosmologies, particle horizon, General Relativity and Quantum Cosmology, Settore MAT/07 - Fisica Matematica, Elementary particle physics, scalar field cosmologies, particle horizon, phantom field, quintessence, High Energy Physics - Theory (hep-th), 83-XX, 83F05, 83C15, phantom field, Settore MAT/03 - Geometria

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	citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).	3
	popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.	Average
	influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).	Average
	impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.	Average

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