scholarly journals Generalized Vaidya solutions in bimetric gravity

2020 ◽  
Vol 37 (14) ◽  
pp. 145010 ◽  
Author(s):  
Marcus Högås ◽  
Mikica Kocic ◽  
Francesco Torsello ◽  
Edvard Mörtsell
Keyword(s):  
Bimetric Gravity

scholarly journals Bimetric gravity is cosmologically viable

2015 ◽  
Vol 748 ◽  
pp. 37-44 ◽  
Author(s):  
Yashar Akrami ◽  
S.F. Hassan ◽  
Frank Könnig ◽  
Angnis Schmidt-May ◽  
Adam R. Solomon
Keyword(s):  
Bimetric Gravity

scholarly journals Massive gravity from bimetric gravity

2012 ◽  
Vol 30 (1) ◽  
pp. 015004 ◽  
Author(s):  
Valentina Baccetti ◽  
Prado Martín-Moruno ◽  
Matt Visser
Keyword(s):  
Massive Gravity ◽  
Bimetric Gravity

BULK VISCOUS BIANCHI TYPE I BAROTROPIC FLUID COSMOLOGICAL MODEL WITH VARYING Λ AND FUNCTIONAL RELATION ON HUBBLE PARAMETER IN ROSEN’S BIMETRIC GRAVITY

2021 ◽  
Vol 10 (5) ◽  
pp. 2515-2525
Author(s):  
N.P. Gaikwad ◽  
P.V. Lepse ◽  
B.K. Bishi ◽  
N.K. Ashtankar
Keyword(s):  
Cosmological Model ◽  
Hubble Parameter ◽  
Bianchi Type ◽  
Functional Relation ◽  
Late Time ◽  
Type I ◽  
Bianchi Type I ◽  
Barotropic Fluid ◽  
Bimetric Gravity ◽  
Bulk Viscous

We have deduced that bulk viscous Bianchi type I barotropic fluid cosmological model with varying $\Lambda$ and functional relation on hubble parameter by solving the field equations bimetric theory of gravitation. It is observed that our model has exponentially accelerating expansion at late time starting with decelerating expansion which agreed the observation of Perlmutter (1998), Knop (2003), Tegmark (2004) and Spergel (2006). In the beginning, our model has more than three spatial-dimensions then it switched over to three-dimensional spatial geometry at late epoch of time and it is agreed with Borkar et al. (2013). Other geometrical and physical behavior of the model have been studied.

scholarly journals No-go theorem for bimetric gravity with positive and negative mass

2009 ◽  
Vol 80 (10) ◽  
Author(s):  
Manuel Hohmann ◽  
Mattias N. R. Wohlfarth
Keyword(s):  
Negative Mass ◽  
Bimetric Gravity

scholarly journals FLUCTUATION SPECTRUM FROM A SCALAR-TENSOR BIMETRIC GRAVITY THEORY

2003 ◽  
Vol 12 (04) ◽  
pp. 697-712 ◽  
Author(s):  
M. A. CLAYTON ◽  
J. W. MOFFAT
Keyword(s):  
Scalar Field ◽  
Gravitational Waves ◽  
Early Universe ◽  
Initial Period ◽  
Field Potential ◽  
Gravity Theory ◽  
Fluctuation Spectrum ◽  
Quadratic Potential ◽  
Initial Values ◽  
Bimetric Gravity

Predictions of the CMB spectrum from a bimetric gravity theory (BGT)1 are presented. The initial inflationary period in BGT is driven by a vanishingly small speed of gravitational waves vg in the very early universe. This initial inflationary period is insensitive to the choice of scalar field potential and initial values of the scalar field. After this initial period of inflation, vg will increase rapidly and the effects of a potential will become important. We show that a quadratic potential introduced into BGT yields an approximately flat spectrum with inflation parameters: ns=0.98, nt=-0.027, αs=-3.2×10-4 and αt=-5.0×10-4, with r ≥ 0.014.

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