135,735 research outputs found
Paurocephala phalaki Mathur 1975
No full text<i>Paurocephala phalaki</i> Mathur <p> <i>Paurocephala phalaki</i> Mathur, 1975: 58. Holotype, India: Bengal, Tista village, 27 October 1965, (V. R. Phalak) (IFRI), not examined.</p> <p> <i>Description.</i> Species of the <i>chonchaiensis</i> type.</p> <p>Adult: described by Mathur (1975).</p> <p>Fifth instar larva: described by Mathur (1975).</p> <p> <i>Host plants</i>. According to Mathur (1975) the common name of the host plant in Bengal is ‘khasare’. No information was found with this local plant name, but a similar name ‘khesari’ refers to <i>Lathyrus sativus</i> L. (Fabaceae) (E. Gauda, personal communication).</p> <p> <i>Distribution</i>. India (Bengal) (Mathur, 1975), (Madras) (Kandasamy, 1986).</p> <p> <i>Comments</i>. The description provided by Mathur (1975) agrees with <i>P. bifasciata</i> Kuwayama diVering only in body setiferation. Only two long setae on genae were mentioned by Mathur (1975) for <i>P. phalaki</i> Mathur, whereas the head of <i>P. bifasciata</i> Kuwayama is completely covered by long setae. No material of the former was available for examination.</p>Published as part of <i>Mifsud, D. & Burckhardt, D., 2002, Taxonomy and phylogeny of the Old World jumping plant-louse genus Paurocephala (Insecta, Hemiptera, Psylloidea), pp. 1887-1986 in Journal of Natural History 36 (16)</i> on page 1968, DOI: 10.1080/00222930110048909, <a href="http://zenodo.org/record/5299071">http://zenodo.org/record/5299071</a>
Mathur and VanderWeele's d (R code)
No full textR code (computer code) to calculate Mathur and VanderWeele's (2020) d, SE, and confidence intervals.Equations provided in reference below. Mathur, M.B., & VanderWeele, T.J. (2020). A simple, interpretable conversion from Pearson’s correlation to Cohen’s for d continuous exposures. Epidemiology, 31(2), e16–e18. https://doi.org/10.1097/ ede.0000000000001105</p
Feasibility study of geospatial mapping of chronic disease risk to inform public health commissioning
No full textThis final article is available for use under the terms of the Creative Commons Attribution Non-Commercial 2.0 Licence; see http://bmjopen.bmj.co
Diaphorina communis Mathur 1975
No full text<i>Diaphorina communis</i> Mathur, 1975 <p> <b>Distribution.</b> Bhutan (Donovan <i>et al.</i> 2012); India: Uttarakhand (Mathur 1935, as <i>Diaphorina</i> sp.; Mathur 1975; Loginova 1978, as <i>D. mathuri</i>); Nepal (Hodkinson 1986).</p> <p> <b>Host plant.</b> <i>Murraya koenigii,</i> <i>M. paniculata</i> (Rutaceae).</p>Published as part of <i>Burckhardt, Daniel, Sharma, Anamika & Raman, Anantanarayanan, 2018, Checklist and comments on the jumping plant-lice (Hemiptera: Psylloidea) from the Indian subcontinent, pp. 1-38 in Zootaxa 4457 (1)</i> on page 11, DOI: 10.11646/zootaxa.4457.1.1, <a href="http://zenodo.org/record/1457537">http://zenodo.org/record/1457537</a>
Oscillating supertubes and neutral rotating black hole microstates
No full textThe construction of neutral black hole microstates is an important problem, with implications for the information paradox. In this paper we conjecture a construction of non-supersymmetric supergravity solutions describing D-brane configurations which carry mass and angular momentum, but no other conserved charges. We first study a classical string solution which locally carries dipole winding and momentum charges in two compact directions, but globally carries no net winding or momentum charge. We investigate its backreaction in the D1-D5 duality frame, where this object becomes a supertube which locally carries oscillating dipole D1-D5 and NS1-NS5 charges, and again carries no net charge. In the limit of an infinite straight supertube, we find an exact supergravity solution describing this object. We conjecture that a similar construction may be carried out based on a class of two-charge non-supersymmetric D1-D5 solutions. These results are a step towards demonstrating how neutral black hole microstates may be constructed in string theory
Geometry of D1-D5-P bound states
No full textSupersymmetric solutions of 6-d supergravity (with two translation symmetries) can be written as a hyperkahler base times a 2-D fiber. The subset of these solutions which correspond to true bound states of D1-D5-P charges give microstates of the 3-charge extremal black hole. To understand the characteristics shared by the bound states we decompose known bound state geometries into base-fiber form. The axial symmetry of the solutions make the base Gibbons-Hawking. We find the base to be actually `pseudo-hyperkahler': The signature changes from (4,0) to (0,4) across a hypersurface. 2-charge D1-D5 geometries are characterized by a `central curve' ; the analogue for 3-charge appears to be a hypersurface that for our metrics is an orbifold of
Fuzzball geometries and higher derivative corrections for extremal holes
No full text2-charge D1-D5 microstates are described by geometries which end in `caps' near r=0; these caps reflect infalling quanta back in finite time. We estimate the travel time for 3-charge geometries in 4-D, and find agreement with the dual CFT. This agreement supports a picture of `caps' for 3-charge geometries. We argue that higher derivative corrections to such geometries arise from string winding modes. We then observe that the `capped' geometries have no noncontractible circles, so these corrections remain bounded everywhere and cannot create a horizon or singularity
Unwinding of strings thrown into a fuzzball
No full textThe traditional black hole has a horizon, with a singularity inside the horizon. But actual microstates of black holes are ‘fuzzballs’, with no horizon and a complex internal structure. We take the simplest hole in string theory — the extremal 2-charge D1D5 hole — and study a simple effect that is a consequence of this internal structure of the fuzzball. Suppose we have a NS1 string wrapping the compact circle of the fuzzball solution. In the traditional black hole solution this circle is directly tensored with the remaining directions, and does not shrink to zero size. Thus a part of the string can fall behind the horizon, but not ‘unwind’. In the fuzzball geometry, this circle makes a nontrivial geometric structure — the KK monople — by mixing with the other directions, and thus shrinks to zero at the core of the monopole. Thus the string can ‘unwind’ in the fuzzball geometry, and the winding charge is then manifested by a nontrivial field strength living on the microstate solution. We compute this field strength for a generic microstate, and comment briefly on the physics suggested by the unwinding process
Comments on black holes I: the possibility of complementarity
No full textWe comment on a recent paper of Almheiri, Marolf, Polchinski and Sully who argue against black hole complementarity based on the claim that an infalling observer 'burns' as he approaches the horizon. We show that in fact measurements made by an infalling observer outside the horizon are statistically identical for the cases of vacuum at the horizon and radiation emerging from a stretched horizon. This forces us to follow the dynamics all the way to the horizon, where we need to know the details of Planck scale physics. We note that in string theory the fuzzball structure of microstates does not give any place to 'continue through' this Planck regime. AMPS argue that interactions near the horizon preclude traditional complementarity. But the conjecture of 'fuzzball complementarity' works in the opposite way: the infalling quantum is absorbed by the fuzzball surface, and it is the resulting dynamics that is conjectured to admit a complementary description
The fuzzball nature of two-charge black hole microstates
No full textIt has been suggested by A. Sen that the entropy of two-charge supersymmetric bound states in string theory should be accounted for by adding the entropy of source-free horizonless supergravity solutions to the entropy associated with the horizons of small black holes. This would imply that the entropy arises differently depending on the duality frame: in the D1-D5 frame one would count source-free horizonless solutions, while in the NS1-P frame one would compute the area of a horizon. This might lead to the belief that the microstates are described by fuzzball solutions in the D1-D5 duality frame but by a black hole with a horizon in the latter. We argue that this is not the case, and that the microstates are fuzzballs in all duality frames. We observe that the scaling argument used by Sen fails to account for the entropy in the D1-P and other duality frames. We also note that the traditional extremal black hole solution is not a complete string background, since finite-action paths connect the exterior near-horizon extremal throat to the region inside the horizon, including the singularity. The singularity of the traditional black hole solution does not give a valid boundary condition for a fundamental string; correcting this condition by resolving the singularity modifies the black hole to a fuzzball with no horizon. We argue that for questions of counting states, the traditional black hole solution should be understood through its Euclidean continuation as a saddle point, and that the Lorentzian states being counted are fuzzballs in all duality frames.</p
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