Results 51 to 60 of about 1,145,029 (201)
Slowly rotating neutron stars in scalar-tensor theories with a massive scalar field [PDF]
Phys. Rev. D 93, 084038 (2016), 2016 In the scalar-tensor theories with a massive scalar field the coupling constants, and the coupling functions in general, which are observationally allowed, can differ significantly from those in the massless case. This fact naturally implies that the scalar-tensor neutron stars with a massive scalar field can have rather different structure and ...
arxiv +1 more source
Interactions in scalar field cosmology [PDF]
Physical Review D, 2000 17 pages, 3 figures,submitted to Phys ...
Alan Coley, Andrew P. Billyard
openaire +3 more sources
Instability of cosmological event horizons of nonstatic global cosmic strings II: perturbations of gravitational waves and massless scalar field [PDF]
Phys.Rev.D57:6089-6093,1998, 1998 The stability of the cosmological event horizons (CEHs) of a class of non-static global cosmic strings is studied against perturbations of gravitational waves and massless scalar field. It is found that the perturbations of gravitational waves always turn the CEHs into non-scalar weak spacetime curvature singularities, while the ones of massless scalar
arxiv +1 more source
, 2006 We study general properties of attractors for scalar-field dark energy scenarios which possess cosmological scaling solutions. In all such models there exists a scalar-field dominant solution with an energy fraction \Omega_{\phi}=1 together with a ...
E. J. Copeland +3 more
core +1 more source
Real scalar fields on manifolds [PDF]
Journal of Physics A: Mathematical and Theoretical, 2008 A generic theory of a single real scalar field is considered, and a simple method is presented for obtaining a class of solutions to the equation of motion. These solutions are obtained from a simpler equation of motion that is generated by replacing a set of the original coordinates by a set of generalized coordinates, which are harmonic functions in ...
openaire +3 more sources
Instability of Massive Scalar Fields in Kerr-Newman Spacetime
, 2004 We investigate the instability of charged massive scalar fields in Kerr-Newman spacetime. Due to the super-radiant effect of the background geometry, the bound state of the scalar field is unstable, and its amplitude grows in time.
Furuhashi, Hironobu, Nambu, Yasusada
core +1 more source
Absence of resonant decay for metastable vacua in gauge theories of scalar fields [PDF]
JHEP 0809:077,2008, 2008 We prove the impossibility of resonant decay of a metastable vacuum in a theory of a scalar field coupled to a gauge field. Our result extends to gauge theories of scalar fields a recent no go theorem for resonant tunneling in a pure scalar field theory.
arxiv +1 more source
Born-Infeld black holes coupled to a massive scalar field
, 2009 Born-Infeld black holes in the Scalar-Tensor Theories of Gravity, in the case of massless scalar field, have been recently obtained. The aim of the current paper is to study the effect from the inclusion of a potential for the scalar field in the theory,
Banerjee N. +11 more
core +1 more source
Zeta-nonlocal scalar fields [PDF]
Theoretical and Mathematical Physics, 2008 We consider some nonlocal and nonpolynomial scalar field models originated from p-adic string theory. Infinite number of spacetime derivatives is determined by the operator valued Riemann zeta function through d'Alembertian $\Box$ in its argument. Construction of the corresponding Lagrangians L starts with the exact Lagrangian $\mathcal{L}_p$ for ...
openaire +4 more sources
Nontrivial directions for scalar fields [PDF]
Physical Review D, 1996 UUencoded LaTex, 15 pages + 3 postscript ...
Kenneth Halpern, Kerson Huang
openaire +4 more sources