Evidence for Compact Dark Matter in Galactic Halos

Clumped dark matter arises naturally within the framwork of generic cosmological dark matter models. Invoking the existence of dark matter clumps can also solve may unexplained mysteries in astrophysics and geology or geophysics, eg. the galactic gamma-ray halo and the periodic terrestrial flood basalt volcanic episodes. Clumped dark matter is dynamically stable to friction and will not heat the disk. Such clumps may have already been discovered in the form of dwarf spheroidals, and further searches are encouraged by the results of this paper.Comment: Revised Version, includes new relevant references, Latex File, 16 pages, no figure

An Alternative Explanation for the Equality of Male and Female Unemployment Rates in the U.S. Labor Market in the Late 1980s

Given demographic trends, public policies in the future may be aimed at stimulating the availability of nursing home care in the U.S. This paper estimates how certificate of need laws, Medicaid reimbursement rates, and state corporate income tax rates affect the availability of nursing home care in markets throughout the U.S. The results indicate that the Medicaid reimbursement rate directly affects the availability of nursing home care. The findings also suggest that the state corporate tax rate inversely influences the provision of nursing care. Finally, the availability of nursing care is not affected by the presence of certificate of need laws.Female; Unemployment Rate; Unemployment

Neutrino and astroparticle physics : Working group report

The contributions made to the Working Group activities on neutrino and astroparticle physics are summarised in this article. The topics discussed were leptogenesis in Left-Right symmetric model, inflationary models in Raman-Sundrum scenarios, ultra high energy cosmic rays and neutrino oscillations in 4 flavour and decaying neutrino models.Comment: 11 pages; arXiv copy of contribution to WHEPP-6 proceeding

Determination of pseudo-Goldstone boson-photon coupling by the differential time delay of pulsar signals

Pseudo-Goldstone bosons couple with photons through a P and T violating interaction of the form ${\cal {L_I}}=g_{a\gamma \gamma}~ a F\tilde F$. Strong magnetic fields in rotating compact stars induce a non-zero ${\vec E}\cdot{\vec B}$ outside the stellar surface which acts as a source for the pseudo-scalar field. Pulsar signals propagating through this pseudo-scalar `hair' suffer a differential time lag between the left and the right circularly polarised modes because of the P and T violating pseudoscalar boson-photon interaction. Determination of this time lag upto a microsecond accuracy can lead to a measurment of (or rule out) pseudo-Goldstone boson-photon coupling upto $g_{a \gamma \gamma}\leq 4.6 \times 10^{-9}~GeV^{-1}$.Comment: Plain TeX,12 pages,IP/BBSR/92-9