10,582 research outputs found
Sato--Tate, cyclicity, and divisibility statistics on average for elliptic curves of small height
We obtain asymptotic formulae for the number of primes for which the
reduction modulo of the elliptic curve \E_{a,b} : Y^2 = X^3 + aX + b
satisfies certain ``natural'' properties, on average over integers and
with and , where and are small relative to .
Specifically, we investigate behavior with respect to the Sato--Tate
conjecture, cyclicity, and divisibility of the number of points by a fixed
integer
Fractional parts of Dedekind sums
Using a recent improvement by Bettin and Chandee to a bound of Duke,
Friedlander and Iwaniec~(1997) on double exponential sums with Kloosterman
fractions, we establish a uniformity of distribution result for the fractional
parts of Dedekind sums with and running over rather general
sets. Our result extends earlier work of Myerson (1988) and Vardi (1987). Using
different techniques, we also study the least denominator of the collection of
Dedekind sums on average
for .Comment: Using recent results of S. Bettin and V. Chandee, arXiv 1502.00769,
we have improved some of our result
Integers with a large smooth divisor
We study the function that counts the number of positive
integers which have a divisor with the property that
for every prime dividing . We also indicate some cryptographic
applications of our results
Supersymmetry, the Cosmological Constant and a Theory of Quantum Gravity in Our Universe
There are many theories of quantum gravity, depending on asymptotic boundary
conditions, and the amount of supersymmetry. The cosmological constant is one
of the fundamental parameters that characterize different theories. If it is
positive, supersymmetry must be broken. A heuristic calculation shows that a
cosmological constant of the observed size predicts superpartners in the TeV
range. This mechanism for SUSY breaking also puts important constraints on low
energy particle physics models. This essay was submitted to the Gravity
Research Foundation Competition and is based on a longer article, which will be
submitted in the near future
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