Orbital Period and Accretion Rate in Cataclysmic Variables: A Test of Magnetic Braking and Gravitational Radiation Regimes

This paper evaluates orbital period and accretion rate in cataclysmic variables using published survey values and a transparent calculation whose inputs and outputs are recorded in full. The analysis finds headline values including Mdot_5h_Msun_per_yr = 5e-09; Mdot_4h_Msun_per_yr = 3e-09; Mdot_3h_Msun_per_yr = 1e-09 and discusses what the result implies for the interpretation of cataclysmic variable and nova observations. Systematic uncertainties are addressed explicitly, and the limits of the simplified treatment are stated so that the numbers can be reused, checked and improved as better survey values become available. The paper is organised as follows. The introduction sets out the physical question and why it matters. The second section reviews the published values adopted. The third section describes the calculation in enough detail for independent reproduction. The fourth section reports the computed results. The fifth and sixth sections examine sensitivity and observational context, and the final section draws conclusions. All numerical statements in the results and discussion are drawn from the accompanying computation, which uses only the published values listed in the text and references.