TY - JOUR
T1 - Inflation from a nonlinear magnetic monopole field nonminimally coupled to curvature
AU - Otalora, Giovanni
AU - Övgün, Ali
AU - Saavedra, Joel
AU - Videla, Nelson
N1 - Funding Information:
G. O. acknowledges DI-VRIEA for financial support through Proyecto Postdoctorado 2017 VRIEA-PUCV. This work was supported by Comisión Nacional de Ciencias y Tecnología of Chile through FONDECYT Grant No 3170035 (A. Ö.), No 1170279 (J. S.) and No 11170162 (N. V.). A. Ö. is grateful to Prof. Douglas Singleton for hosting him at the California State University, Fresno and also thanks to Prof. Leonard Susskind and Stanford Institute for Theoretical Physics for hospitality.
Publisher Copyright:
© 2018 IOP Publishing Ltd and Sissa Medialab.
PY - 2018/6/1
Y1 - 2018/6/1
N2 - In the context of nonminimally coupled f(R) gravity theories, we study early inflation driven by a nonlinear monopole magnetic field which is nonminimally coupled to curvature. In order to isolate the effects of the nonminimal coupling between matter and curvature we assume the pure gravitational sector to have the Einstein-Hilbert form. Thus, we study the most simple model with a nonminimal coupling function which is linear in the Ricci scalar. From an effective fluid description, we show the existence of an early exponential expansion regime of the Universe, followed by a transition to a radiation-dominated era. In particular, by applying the most recent results of the Planck collaboration we set the limits on the parameter of the nonminimal coupling, and the quotient of the nonminimal coupling and the nonlinear monopole magnetic scales. We found that these parameters must take large values in order to satisfy the observational constraints. Furthermore, by obtaining the relation for the graviton mass, we show the consistency of our results with the recent gravitational wave data GW170817 of LIGO and Virgo.
AB - In the context of nonminimally coupled f(R) gravity theories, we study early inflation driven by a nonlinear monopole magnetic field which is nonminimally coupled to curvature. In order to isolate the effects of the nonminimal coupling between matter and curvature we assume the pure gravitational sector to have the Einstein-Hilbert form. Thus, we study the most simple model with a nonminimal coupling function which is linear in the Ricci scalar. From an effective fluid description, we show the existence of an early exponential expansion regime of the Universe, followed by a transition to a radiation-dominated era. In particular, by applying the most recent results of the Planck collaboration we set the limits on the parameter of the nonminimal coupling, and the quotient of the nonminimal coupling and the nonlinear monopole magnetic scales. We found that these parameters must take large values in order to satisfy the observational constraints. Furthermore, by obtaining the relation for the graviton mass, we show the consistency of our results with the recent gravitational wave data GW170817 of LIGO and Virgo.
KW - ination
KW - magnetic fields
KW - modified gravity
UR - http://www.scopus.com/inward/record.url?scp=85051234724&partnerID=8YFLogxK
U2 - 10.1088/1475-7516/2018/06/003
DO - 10.1088/1475-7516/2018/06/003
M3 - Article
AN - SCOPUS:85051234724
VL - 2018
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
SN - 1475-7516
IS - 6
M1 - 003
ER -