119190601
STABLE SUPER-INFLATING COSMOLOGICAL SOLUTIONS IN f(R)-GRAVITY
We consider super-inflating solutions in modified gravity for several popular families of f(R) functions. Using scalar field reformulation of f(R)-gravity we describe how the form of effective scalar field potential can be used for explaining existence of stable super-inflation solutions in the theory under consideration. Several new solutions of this type have been found analytically and checked numerically.
118722197
Testing Lorentz invariance of dark matter
We study the possibility to constrain deviations from Lorentz invariance in dark matter (DM) with cosmological observations. Breaking of Lorentz invariance generically introduces new light gravitational degrees of freedom, which we represent through a dynamical timelike vector field. If DM does not obey Lorentz invariance, it couples to this vector field. We find that this coupling affects the inertial mass of small DM halos which no longer satisfy the equivalence principle. For large enough lumps of DM we identify a (chameleon) mechanism that restores the inertial mass to its standard value. As a consequence, the dynamics of gravitational clustering are modified. Two prominent effects are a scale dependent enhancement in the growth of large scale structure and a scale dependent bias between DM and baryon density perturbations. The comparison with the measured linear matter power spectrum in principle allows to bound the departure from Lorentz invariance of DM at the per cent level.
118350677
Cosmological dynamics of fourth-order gravity with a Gauss-Bonnet term
We consider the cosmological dynamics of fourth-order gravity with both f(R) and Φ(G) corrections to the Einstein gravity (G is the Gauss-Bonnet invariant). The particular case for which both terms are equally important on power-law solutions is described. These solutions and their stability are studied using the dynamic system approach. We also discuss the condition of existence and stability of a de Sitter solution in a more general situation of power-law f and Φ.
14740363
A few remarks about the Pioneer anomaly
Some features of the Pioneer anomaly are discussed in context of author’s explanation of this effect as a deceleration of the probes in the graviton background. It is noted that if the model is true then the best parameter of the anomalous acceleration should be not the distance to the Sun but a cosine of the angle between a velocity of the probe and its radius-vector.
14263635
SUPER-STRONG INTERACTING GRAVITONS AS A MAIN ENGINE OF THE UNIVERSE WITHOUT EXPANSION OR DARK ENERGY
The basic cosmological conjecture about the Dopplerian nature of redshifts may be false if gravitons are super-strong interacting particles. A quantum mechanism of classical gravity and the main features of a new cosmological paradigm based on it are described here.
8984328
The graviton background: a new way to quantum gravity
Graviton pairing and destruction of these pairs under collisions with bodies may lead to the Newtonian attraction. It opens us a new way to a very-low-energy quantum gravity model. In the model by the author, cosmological redshifts are caused by interactions of photons with gravitons of the background. Non-forehead collisions with gravitons lead to an additional relaxation of any photonic flux. Total galaxy number counts/redshift and galaxy number counts/magnitude relations are computed and found to be in a good agreement with galaxy observations.
119064723
The Quark Confinement Model of Hadrons
INTRODUCTION QCD-HADRONIZATION QCD functional with a gluon background Quarks in vacuum gluon fields QCD bosonization The composites condition Z^O2 = 0 THE QUARK CONFINEMENT MODEL Quark-hadron interactions The calculation technique in the QCM The choice of the confinement function The chiral fit LIGHT MESONS Introduction The interaction Lagrangian The Dalitz decays The pion form factor Scalar mesons A role of axial mesons in the electroweak decay ^D*p->^DIevyPion and kaon polarizabilities Appendix References BARYONS AS THREE-QUARK SYSTEMS Introduction Quark currents of baryons Confinement ansatz for three-quark states Quark-diquark approximation Electromagnetic form factors of baryons Strong meson-baryon form factors HEAVY QUARKS Introduction ... Toward heavy quarks Kinematics of semileptonic meson decays Heavy final states Light final states b-c flavor changing decays of baryons Appendix References INDEX
1458405
Low-energy quantum gravity: new challenges for an experiment and observation
Some new challenges for an experiment and observation, which are consequences of the model of low-energy quantum gravity by the author, are considered here. In particular, the property of asymptotic freedom of this model leads to the unexpected consequence: if a black hole arises due to a collapse of a matter with some characteristic mass of particles, its full mass should be restricted from the bottom. For usual baryonic matter, this limit of mass is of the order $10^{7}M_{\odot}$.