caa a22 4500 46788790X CHVBK 20180406152739.0 cr unu---uuuuu 170328e20060201xx s 000 0 eng 10.1007/s10714-005-0219-4 doi (NATIONALLICENCE)springer-10.1007/s10714-005-0219-4 Conformal invariance and spontaneous symmetry breaking [Elektronische Daten] [S. Mirabotalebi, H. Salehi] We study the spontaneous symmetry breaking in a conformally invariant gravitational theory. We particularly emphasize on the nonminimal coupling of matter fields to gravity. By the nonminimal coupling we consider a local distinction between the conformal frames of metric of matter fieldsand the metric explicitly entering the vacuum sector. We suppose that these two frames are conformally related by a dilaton field. We show that the imposition of a condition on the variable mass term of a scalar field may lead to the spontaneous symmetry breaking. In this way the scalar field may imitate the Higgs field behavior. Attributing a constant configuration to the ground state of the Higgs field, a Higgs conformal frame is specified. We define the Higgs conformal frame as a cosmological frame which describes the large scale characteristics of the observed universe. In the cosmological frame the gravitational coupling acquires a correct value and one no longer deals with the vacuum energy problem. We then study a more general case by considering a variable configuration for the ground state of Higgs field. In this case we introduce a cosmological solution of themodel. Springer-Verlag, 2005 Nonminimal coupling nationallicence Higgs field nationallicence Cosmology nationallicence Mirabotalebi S. Department of Physics, Shahid Beheshti University, 19839, Evin, Tehran, Iran aut Salehi H. Department of Physics, Shahid Beheshti University, 19839, Evin, Tehran, Iran aut General Relativity and Gravitation Springer US; http://www.springer-ny.com 38/2(2006-02-01), 269-277 0001-7701 38:2<269 2006 38 10714 https://doi.org/10.1007/s10714-005-0219-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10714-005-0219-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mirabotalebi S. Department of Physics, Shahid Beheshti University, 19839, Evin, Tehran, Iran aut NATIONALLICENCE 700 1- Salehi H. Department of Physics, Shahid Beheshti University, 19839, Evin, Tehran, Iran aut NATIONALLICENCE 773 0- General Relativity and Gravitation Springer US; http://www.springer-ny.com 38/2(2006-02-01), 269-277 0001-7701 38:2<269 2006 38 10714 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer