443 research outputs found
First steps towards -adic Langlands functoriality
By the theory of Colmez and Fontaine, a de Rham representation of the Galois
group of a local field roughly corresponds to a representation of the
Weil-Deligne group equipped with an admissible filtration on the underlying
vector space. Using a modification of the classical local Langlands
correspondence, we associate with any pair consisting of a Weil-Deligne group
representation and a type of a filtration (admissible or not) a specific
locally algebraic representation of a general linear group. We advertise the
conjecture that this pair comes from a de Rham representation if and only if
the corresponding locally algebraic representation carries an invariant norm.
In the crystalline case, the Weil-Deligne group representation is unramified
and the associated locally algebraic representation can be studied using the
classical Satake isomorphism. By extending the latter to a specific norm
completion of the Hecke algebra, we show that the existence of an invariant
norm implies that our pair, indeed, comes from a crystalline representation. We
also show, by using the formalism of Tannakian categories, that this latter
fact is compatible with classical unramified Langlands functoriality and
therefore generalizes to arbitrary split reductive groups
An adjunction formula for the Emerton-Jacquet functor
The Emerton–Jacquet functor is a tool for studying locally analytic representations of p-adic Lie groups. It provides a way to access the theory of p-adic automorphic forms. Here we give an adjunction formula for the Emerton–Jacquet functor, relating it directly to locally analytic inductions, under a strict hypothesis that we call non-critical. We also further study the relationship to socles of principal series in the non-critical setting
Detector of alpha particles and x-rays operating in ambient air in pulse counting mode or/and with gas amplification
Ionization chambers working in ambient air in current detection mode are
widely used in several applications such as smoke detection, dosimetry,
therapeutic beam monitoring and cetera. The aim of this work was to investigate
if gaseous detectors can operate in ambient air in pulse counting mode as well
as with gas amplification. . To investigate the feasibility of this method two
types of open- end gaseous detectors were build and successfully tested. The
first one was a single wire or multiwire cylindrical geometry detector
operating in pulse mode at a gas gain of 1. The second type alpha detector was
an innovative GEM-like detector with resistive electrodes operating in air in
avalanche mode at high gas gains (up to 10E4). A detailed comparison between
these two detectors is given as well as comparison with the commercially
available alpha detectors. The main advantages of gaseous detectors operating
in air in a pulse detection mode are their simplicity, low cost and high
sensitivity. One of the possible applications of these new detectors is alpha
particle background monitors which, due to their low cost can find wide
application not only in houses, but in public areas: airports, railway station
and so on
Progress in the development of a S RETGEM-based detector for an early forest fire warning system
In this paper we present a prototype of a Strip Resistive Thick GEM
photosensitive gaseous detector filled with Ne and ethylferrocene vapours at a
total pressure of 1 atm for an early forest fire detection system. Tests show
that it is one hundred times more sensitive than the best commercial
ultraviolet flame detectors and therefore, it is able to reliably detect a
flame of 1.5x1.5x1.5 m3 at a distance of about 1km. An additional and unique
feature of this detector is its imaging capability, which in combination with
other techniques, may significantly reduce false fire alarms when operating in
an automatic mode.
Preliminary results conducted with air filled photosensitive gaseous
detectors are also presented. The approach main advantages include both the
simplicity of manufacturing and affordability of construction materials such as
plastics and glues specifically reducing detector production cost. The
sensitivity of these air filled detectors at certain conditions may be as high
as those filled with Ne and EF. Long term test results of such sealed detectors
indicate a significant progress in this direction.
We believe that our detectors utilized in addition to other flame and smoke
sensors will exceptionally increase the sensitivity of forest fire detection
systems. Our future efforts will be focused on attempts to commercialize such
detectors utilizing our aforementioned findings.Comment: Presented at the International Conference on Micropattern gaseous
detectors, Crete, Greece, June 200
Moments of the critical values of families of elliptic curves, with applications
We make conjectures on the moments of the central values of the family of all
elliptic curves and on the moments of the first derivative of the central
values of a large family of positive rank curves. In both cases the order of
magnitude is the same as that of the moments of the central values of an
orthogonal family of L-functions. Notably, we predict that the critical values
of all rank 1 elliptic curves is logarithmically larger than the rank 1 curves
in the positive rank family.
Furthermore, as arithmetical applications we make a conjecture on the
distribution of a_p's amongst all rank 2 elliptic curves, and also show how the
Riemann hypothesis can be deduced from sufficient knowledge of the first moment
of the positive rank family (based on an idea of Iwaniec).Comment: 24 page
Performance of wire-type Rn detectors operated with gas gain in ambient air in view of its possible application to early earthquake predictions
We describe a detector of alpha particles based on wire type counters
(single-wire and multiwire) operating in ambient air at high gas gains
(100-1000). The main advantages of these detectors are: low cost, robustness
and ability to operate in humid air. The minimum detectable activity achieved
with the multiwire detector for an integration time of 1 min is 140 Bq per m3,
which is comparable to that featured by commercial devices. Owing to such
features the detector is suited for massive application, for example for
continuous monitoring of Rn or Po contaminations or, as discussed in the paper,
its use in a network of Rn counters in areas affected by earth-quakes in order
to verify, on a solid statistical basis, the envisaged correlation between the
sudden Rn appearance and a forthcoming earthquake
Urinary peptidomics provides a noninvasive humanized readout of diabetic nephropathy in mice
Nephropathy is among the most frequent complications of diabetes and the leading cause of end-stage renal disease. Despite the success of novel drugs in animal models, the majority of the subsequent clinical trials employing those drugs targeting diabetic nephropathy failed. This lack of translational value may in part be due to an inadequate comparability of human disease and animal models that often capture only a few aspects of disease. Here we overcome this limitation by developing a multimolecular noninvasive humanized readout of diabetic nephropathy based on urinary peptidomics. The disease-modified urinary peptides of 2 type 2 diabetic nephropathy mouse models were identified and compared with previously validated urinary peptide markers of diabetic nephropathy in humans to generate a classifier composed of 21 ortholog peptides. This classifier predicted the response to disease and treatment with inhibitors of the renin-angiotensin system in mice. The humanized classifier was significantly correlated with glomerular lesions. Using a human type 2 diabetic validation cohort of 207 patients, the classifier also distinguished between patients with and without diabetic nephropathy, and their response to renin-angiotensin system inhibition. Thus, a combination of multiple molecular features common to both human and murine disease could provide a significant change in translational drug discovery research in type 2 diabetic nephropathy
The classification of irreducible admissible mod p representations of a p-adic GL_n
Let F be a finite extension of Q_p. Using the mod p Satake transform, we
define what it means for an irreducible admissible smooth representation of an
F-split p-adic reductive group over \bar F_p to be supersingular. We then give
the classification of irreducible admissible smooth GL_n(F)-representations
over \bar F_p in terms of supersingular representations. As a consequence we
deduce that supersingular is the same as supercuspidal. These results
generalise the work of Barthel-Livne for n = 2. For general split reductive
groups we obtain similar results under stronger hypotheses.Comment: 55 pages, to appear in Inventiones Mathematica
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