This book deals with the relationship between gravitation and elementary particle physics,
and the implications of these subjects for astrophysics. There has, in recent years, been …

Spherically symmetric perfect fluids are studied under the restriction of shear‐free motion. All
solutions of the field equations are found by solving a single second order nonlinear …

We investigate the class of shear-free expanding (or contracting) irrotational perfect fluids
obeying an equation of state p= p (μ) and satisfying the field equations of general relativity. It …

Geometrical and physical properties of the solutions derived and classified in Part I [J. Math.
Phys. 28, 1118 (1987)] are examined in detail. It is shown how the imposition of zero shear …

Pour une classe étendue de fluides parfaits sans distorsion qui obéissent à une équation
d'état isotrope en relativité générale, ou bien l'expansion ou bien la rotation est nulle; …

The topology of the solutions derived in Part I [J. Math. Phys. 2 8, 1118 (1987)] is discussed
in detail using suitable topological embeddings. It is found that these solutions are …

A class of exact interior solutions is given for adiabatic spherically symmetric motion of a
perfect fluid of uniform density but non-uniform pressure. This is matched to the …

The procedure underlying the matching of 1-form (tetrad) fields in theories possessing
absolute parallelism—f (T) gravity being within this category—is addressed and exemplified …

Motivated by the desirability of direct observational verification of the large-scale
homogeneity of the universe, and relying on assumptions deemed to be well supported by …

A class of solutions describing a wide variety of nonstatic, spherically symmetric, charged,
shear‐free perfect fluid configurations is derived. It is presented in the form of Jacobian …