The cosmological constant has attained a leading role in recent researches in cosmology. We extend the cosmic no-hair theorem to non-minimally coupled theories of gravity where ordinary matter is also present in the form of a perfect fluid. To achieve this goal we give a set of conditions for obtaining de Sitter expansion independently of any initial data (no fine-tuning problem), that is, we introduce a time-dependent (effective) cosmological constant. Finally, we apply the results to some specific models.

A possible way to define an effective cosmological constant in scalar-tensor cosmologies / Capozziello, Salvatore; DE RITIS, Ruggiero; A. A., Marino; Rubano, Claudio; Scudellaro, Paolo. - STAMPA. - Recent Developments in General Relativity:(2000), pp. 63-70. (Intervento presentato al convegno Recent Developments in General Relativity tenutosi a Cala Corvino-Monopoli (Bari) nel Sept. 21-25, 1998).

A possible way to define an effective cosmological constant in scalar-tensor cosmologies

CAPOZZIELLO, SALVATORE;DE RITIS, RUGGIERO;RUBANO, CLAUDIO;SCUDELLARO, PAOLO
2000

Abstract

The cosmological constant has attained a leading role in recent researches in cosmology. We extend the cosmic no-hair theorem to non-minimally coupled theories of gravity where ordinary matter is also present in the form of a perfect fluid. To achieve this goal we give a set of conditions for obtaining de Sitter expansion independently of any initial data (no fine-tuning problem), that is, we introduce a time-dependent (effective) cosmological constant. Finally, we apply the results to some specific models.
2000
8847000688
A possible way to define an effective cosmological constant in scalar-tensor cosmologies / Capozziello, Salvatore; DE RITIS, Ruggiero; A. A., Marino; Rubano, Claudio; Scudellaro, Paolo. - STAMPA. - Recent Developments in General Relativity:(2000), pp. 63-70. (Intervento presentato al convegno Recent Developments in General Relativity tenutosi a Cala Corvino-Monopoli (Bari) nel Sept. 21-25, 1998).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/192794
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