11 research outputs found
Microlensing by natural wormholes: theory and simulations
We provide an in depth study of the theoretical peculiarities that arise in
effective negative mass lensing, both for the case of a point mass lens and
source, and for extended source situations. We describe novel observational
signatures arising in the case of a source lensed by a negative mass. We show
that a negative mass lens produces total or partial eclipse of the source in
the umbra region and also show that the usual Shapiro time delay is replaced
with an equivalent time gain. We describe these features both theoretically, as
well as through numerical simulations. We provide negative mass microlensing
simulations for various intensity profiles and discuss the differences between
them. The light curves for microlensing events are presented and contrasted
with those due to lensing produced by normal matter. Presence or absence of
these features in the observed microlensing events can shed light on the
existence of natural wormholes in the Universe.Comment: 16 pages, 24 postscript figures (3 coloured), revtex style, submitted
to Phys. Rev.
Steroid-protein interactions Kinetics of binding of cortisol and progesterone to human corticosteroid-binding globulin
Interdisciplinary study of the synthesis of the origin of the chemical elements and their role in the formation and structure of the Earth
Palynology and correlation of the Upper Pennsylvanian Tobra Formation from Zaluch Nala, Salt Range, Pakistan
Samples from the upper 84 m of a 125 m thick section of the Tobra Formation at Zaluch Nala, western Salt Range,
Pakistan yielded palynomorph taxa including the spores Horriditriletes sp. and Microbaculispora tentula, abundant
monosaccate pollen including Barakarites cf. rotatus, Cannanoropollis janakii and Plicatipollenites malabarensis, and
rare taeniate and non-taeniate bisaccate pollen. Converrucosisporites grandegranulatus, Cycadopites cymbatus,
Horriditriletes ramosus, Horriditriletes tereteangulatus and Microbaculispora tentula indicate the South Oman 2165B
Biozone (Late Pennsylvanian), suggesting that the Tobra Formation in Zaluch Nala is equivalent to the middle part
of the Al Khlata Formation of South Oman (Petroleum Development Oman (PDO) Al Khlata production unit AK
P5). Brevitriletes leptoacaina, Brevitriletes parmatus, Horriditriletes ramosus and Microbaculispora tentula indicate
the lower part of the Oman and Saudi Arabia Palynological Zone 2 (OSPZ2). The Tobra Formation assemblages are
also correlated with those from Stage 2 and the eastern Australian Microbaculispora tentula Oppel-zone, based on
the occurrence of Brevitriletes cornutus, Brevitriletes parmatus, Cycadopites cymbatus, Horriditriletes ramosus,
Horriditriletes tereteangulatus and Microbaculispora tentula. The Tobra Formation in Zaluch Nala lacks the
deglaciation sequence that is present in several other palaeogeographically nearby basins such as those of south
Arabia and Western Australia. This is an indication of either non-deposition during the deglaciation period or
erosion associated with the unconformity between the Tobra Formation and the overlying Warchha Formation