Stability of phantom k-essence theories

Journal Article · Wed Mar 15 00:00:00 EST 2006 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.73.063522· OSTI ID:20782626

Abramo, L Raul; Pinto-Neto, Nelson ^[1]

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1. Instituto de Fisica, Universidade de Sao Paulo, CP 66318, 05315-970, Sao Paulo (Brazil)

We show that phantom dark energy, if it is described by a k-essence theory, has three fundamental problems: first, its Hamiltonian is unbounded from below. Second, classical stability precludes the equation of state from crossing the 'Lambda-barrier', w{sub {lambda}}=-1. Finally, both the equation of state and the sound speed are unbounded - the first, from below, the second, from above - if the kinetic term is not bounded by dynamics.

• OSTI ID: 20782626
• Journal Information: Physical Review. D, Particles Fields, Vol. 73, Issue 6; Other Information: DOI: 10.1103/PhysRevD.73.063522; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COSMOLOGY
EQUATIONS OF STATE
HAMILTONIANS
NONLUMINOUS MATTER
SOUND WAVES
STABILITY
VELOCITY