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Ruíz Ruíz, Fernando and Redmount, Ian H. (1989) Thermal equilibrium in de Sitter space. Physical Review D, 39 (8). pp. 22892296. ISSN 05562821

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Official URL: http://dx.doi.org/10.1103/PhysRevD.39.2289
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http://journals.aps.org  Publisher 
Abstract
Thermalequilibrium quantum states are constructed for free scalar fields in (%+1)dimensional de Sitter space. The states are described by density matrices of "thermal" form, satisfying the von Neumann equation associated with the appropriate functional Schrodinger equation. These solutions exist only for fields with mass and/or curvature coupling corresponding to conformal invariance. The temperature associated with such a state obeys the classical redshift law. States exist with any temperature value at any given time; the zerotemperature limit is the Euclidean vacuum state. The total field energy of a thermal state above that of the Euclidean vacuum is finite and positive. This excitation energy consists of one contribution which redshifts classically, butit can also contain a contribution which grows in time as the radius of the space.
Item Type:  Article 

Additional Information:  © 1989 The American Physical Society. 
Uncontrolled Keywords:  Astronomy & Astrophysics, Physics, Particles & Fields 
Subjects:  Sciences > Physics 
ID Code:  25491 
Deposited On:  20 May 2014 16:57 
Last Modified:  20 May 2014 16:57 
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