scholarly journals More about scalar gravity

2016 ◽  
Vol 93 (12) ◽  
Author(s):  
E. Bittencourt ◽  
U. Moschella ◽  
M. Novello ◽  
J. D. Toniato
Keyword(s):  
Scalar Gravity

scholarly journals Conformal symmetry, anomaly and effective action for metric-scalar gravity with torsion

2000 ◽  
Vol 479 (4) ◽  
pp. 411-420 ◽  
Author(s):  
J.A. Helayel-Neto ◽  
A. Penna-Firme ◽  
I.L. Shapiro
Keyword(s):  
Effective Action ◽  
Conformal Symmetry ◽  
Scalar Gravity

scholarly journals Hamiltonian analysis of mimetic scalar gravity revisited

2019 ◽  
Vol 99 (6) ◽  
Author(s):  
Alexander Ganz ◽  
Purnendu Karmakar ◽  
Sabino Matarrese ◽  
Dmitri Sorokin
Keyword(s):  
Hamiltonian Analysis ◽  
Scalar Gravity

scholarly journals Gravitational dynamics in the toy model of the Higgs-dark matter sector: the field theoretic perspective

2020 ◽  
Vol 80 (11) ◽  
Author(s):  
Anna Nakonieczna ◽  
Łukasz Nakonieczny
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Mass Parameter ◽  
Apparent Horizon ◽  
Higgs Field ◽  
Radial Pressure ◽  
Model Parameters ◽  
Complex Scalar ◽  
Matter Sector ◽  
Scalar Gravity

AbstractThe objective of the paper was to examine gravitational evolutions in the Higgs-dark matter sector toy model. The real part of the Higgs doublet was modelled by a neutral scalar. Two dark matter candidates introduced were the dark photon and a charged complex scalar. Non-minimal couplings of both scalars to gravity were included. The coupling channels between the ordinary and dark matter sectors were kinetic mixing between the electromagnetic and dark U(1) fields and the Higgs portal coupling among the scalars. The structures of emerging singular spacetimes were either of Schwarzschild or Reissner–Nordström types. The non-minimal scalar–gravity couplings led to an appearance of timelike portions of apparent horizons where they transform from spacelike to null. The features of dynamical black holes were described as functions of the model parameters. The black holes formed later and their radii and masses were smaller as the mass parameter of the complex scalar increased. The dependencies on the coupling of the Higgs field to gravity exhibited extrema, which were a maximum for the time of the black holes formation and minima in the cases of their radii and masses. A set of quantities associated with an observer moving with the evolving matter was proposed. The energy density, radial pressure and pressure anisotropy within dynamical spacetimes get bigger as the singularity is approached. The increase is more considerable in the Reissner–Nordström spacetimes. The apparent horizon local temperature changes monotonically in the minimally coupled case and non-monotonically when non-minimal scalar–gravity couplings are involved.

scholarly journals Spherical self-similar solutions in Einstein-multi-scalar gravity

1998 ◽  
Vol 249 (5-6) ◽  
pp. 383-388 ◽  
Author(s):  
Eric W. Hirschmann ◽  
Anzhong Wang
Keyword(s):  
Self Similar ◽  
Similar Solutions ◽  
Scalar Gravity

CONFORMAL COUPLING'S OUTRAGEOUS LEGACY

2002 ◽  
Vol 11 (10) ◽  
pp. 1531-1536
Author(s):  
L. RAUL ABRAMO ◽  
LEON BRENIG ◽  
EDGARD GUNZIG
Keyword(s):  
Scalar Field ◽  
Scalar Curvature ◽  
The Other ◽  
Minimal Coupling ◽  
Quantum Stability ◽  
Paradoxical Situation ◽  
Other Hand ◽  
The One ◽  
Hilbert Action ◽  
Scalar Gravity

In Einstein's gravity, non-minimal coupling of a scalar field to the scalar curvature leads to a paradoxical situation. On the one hand, it opens the way to qualitatively new cosmological dynamics. On the other hand, there are sectors of non-minimally coupled scalar-gravity theories for which the Einstein–Hilbert action reverses its sign, which seems to indicate that the whole system is unstable. We show how conformal coupling bypasses this problem. Due to a subtle interplay between gravity and the scalar field, classical and quantum stability are guaranteed globally. This liberates conformal coupling from a serious obstacle. Inflationary solutions in the new sector are also presented, which are validated by current observations.

scholarly journals Tensor-scalar gravity and binary-pulsar experiments

1996 ◽  
Vol 54 (2) ◽  
pp. 1474-1491 ◽  
Author(s):  
Thibault Damour ◽  
Gilles Esposito-Farèse
Keyword(s):  
Binary Pulsar ◽  
Scalar Gravity

scholarly journals Black brane solutions and their solitonic extremal limit in Einstein-scalar gravity

2012 ◽  
Vol 85 (8) ◽  
Author(s):  
Mariano Cadoni ◽  
Matteo Serra ◽  
Salvatore Mignemi
Keyword(s):  
Black Brane ◽  
Extremal Limit ◽  
Scalar Gravity
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