Zobrazeno 1 - 10
of 138
pro vyhledávání: '"Boisseau, B."'
Autor:
Boisseau, B., Giacomini, H.
Publikováno v:
JCAP 1910 (2019) no.10, 054
Recently a class of inflationary models satisfying the constant rate of roll constraint, $\ddot{\phi}+(3+\alpha)H\dot{\phi}=0$, has been studied and compared with the latest cosmological observational data. We consider the broader class of constraint
Externí odkaz:
http://arxiv.org/abs/1809.09169
We consider the possibility to produce a bouncing universe in the framework of scalar-tensor gravity when the scalar field has a nonconformal coupling to the Ricci scalar. We prove that bouncing universes regular in the future with essentially the sa
Externí odkaz:
http://arxiv.org/abs/1603.06648
Regular bouncing solutions in the framework of a scalar-tensor gravity model were found in a recent work. We reconsider the problem in the Einstein frame (EF) in the present work. Singularities arising at the limit of physical viability of the model
Externí odkaz:
http://arxiv.org/abs/1507.00792
Publikováno v:
JCAP07(2015)002
We consider the possibility to produce a bouncing universe in the framework of scalar-tensor gravity models in which the scalar field potential may be negative, and even unbounded from below. We find a set of viable solutions with nonzero measure in
Externí odkaz:
http://arxiv.org/abs/1504.07927
Autor:
Boisseau, B.
Publikováno v:
Phys.Rev.D83:043521,2011
We consider the massive scalar-tensor theory in the Jordan frame $F(\Phi) =K^{2}\Phi^2$ and $U(\Phi) =(1/2)m^{2}\Phi^2$, where $F(\Phi)$ corresponds to a constant Brans-Dicke parameter $\omega_{BD}=1/4K^2$. The constraint of the Solar System experime
Externí odkaz:
http://arxiv.org/abs/1011.2915
Publikováno v:
Nucl.Phys.B801:296-315,2008
We present a new efficient analytical approximation scheme to two-point boundary value problems of ordinary differential equations (ODEs) adapted to the study of the derivative expansion of the exact renormalization group equations. It is based on a
Externí odkaz:
http://arxiv.org/abs/0802.1970
Publikováno v:
Nucl.Phys.B789:525-551,2008
The relation between the Wilson-Polchinski and the Litim optimized ERGEs in the local potential approximation is studied with high accuracy using two different analytical approaches based on a field expansion: a recently proposed genuine analytical a
Externí odkaz:
http://arxiv.org/abs/0706.0990
Autor:
Boisseau, B.
Publikováno v:
J.Phys.A37:7923-7938,2004
The Bogoliubov procedure in quantum field theory is used to describe a relativistic almost ideal Bose gas at zero temperature. Special attention is given to the study of a vortex. The radius of the vortex in the field description is compared to that
Externí odkaz:
http://arxiv.org/abs/gr-qc/0210033
Publikováno v:
Phys.Rev.Lett. 85 (2000) 2236
The present acceleration of the Universe strongly indicated by recent observational data can be modeled in the scope of a scalar-tensor theory of gravity. We show that it is possible to determine the structure of this theory (the scalar field potenti
Externí odkaz:
http://arxiv.org/abs/gr-qc/0001066
Autor:
Boisseau, B.
Publikováno v:
Phys.Rev. D61 (2000) 083504
By a weak deformation of the cylindrical symmetry of the potential vortex in a relativistic perfect isentropic fluid, we study the possible dynamics of the central line of this vortex. In "stiff" material the Nanbu-Goto equations are obtained
Co
Co
Externí odkaz:
http://arxiv.org/abs/gr-qc/9911108