Apsidal Clustering following the Inclination Instability

Osteoarthritis following shoulder instability.

The association between shoulder instability and the development of glenohumeral osteoarthritis has not been well studied in the literature. It is clear that some degree of chondral damage is associated with instability, and there appears to be an increased risk of developing symptomatic osteoarthritis and ultimately requiring a shoulder arthroplasty in patients with a history of instability. M...

Instability, Inequality, and Endogenous Clustering

Economic inequality is of interest, not only at some intrinsic level, but also for its close connections to diverse variables, ranging from economic indicators such as growth rates to socio-political outcomes such as collective action and conflict. It is only natural, then, to study the evolution of inequality in an economic system. It is fair to say that the dominant view on this topic is that...

The apsidal motion in binary stars. B.V.Vasiliev

The apsidal motion in binary stars. Abstract It is usually accepted to consider an apsidal motion in binary stars as a direct confirmation that a substance inside stars is not uniformly distributed. It is shown in this paper that the apsidal motion in binary systems observation data is in a good agreement with an existence of uniform plasma cores inside stars if they consist of hydrogen-deuteri...

Planetesimals Born Big by Clustering Instability?

Apsidal Alignment in Upsilon Andromedae

One of the parameters fitted by Doppler radial velocity measurements of extrasolar planetary systems is ω, the argument of pericenter of a given planet’s orbit referenced to the plane of the sky. Curiously, the ω’s of the outer two planets orbiting Upsilon Andromedae are presently nearly identical: ∆ω ≡ ωD − ωC = 4. 8 ± 4. 8 (1σ). This observation is least surprising if planets C and D occupy o...