7,948 research outputs found
Families of Bianchi modular symbols: critical base-change p-adic L-functions and p-adic Artin formalism
Let be an imaginary quadratic field. In this article, we study the
eigenvariety for GL(2)/K, proving an etaleness result for the weight map at
non-critical classical points and a smoothness result at base-change classical
points. We give three main applications of this; let be a regular
-stabilised newform of weight at least 2 without CM by . (1) We
construct a two-variable -adic -function attached to the base-change of
to under assumptions on that we conjecture always hold, in
particular making no assumption on the slope of . (2) We construct
three-variable -adic -functions over the eigenvariety interpolating the
-adic -functions of classical base-change Bianchi cusp forms in families.
(3) We prove that these base-change -adic -functions satisfy a -adic
Artin formalism result, that is, they factorise in the same way as the
classical -function under Artin formalism.
In an appendix, Carl Wang-Erickson describes a base-change deformation
functor and gives a characterisation of its Zariski tangent space.Comment: 26 pages, with a 3 page appendix by Carl Wang-Erickson. Comments
welcome! Changes for v5: added contents, minor changes to exposition. v4:
corrected funding acknowledgements. v3: This version has a new introduction,
has been reorganised and greatly shortened, and incorporates minor
corrections. v2: minor correction
Exceptional zeros and L-invariants of Bianchi modular forms
Let f be a Bianchi modular form, that is, an automorphic form for GL(2) over an imaginary quadratic field F. In this paper, we prove an exceptional zero conjecture in the case where f is new at a prime above p. More precisely, for each prime p of F above p we prove the existence of an L-invariant Lp, depending only on p and f, such that when the p-adic L-function of f has an exceptional zero at p, its derivative can be related to the classical L-value multiplied by Lp. The proof uses cohomological methods of Darmon and Orton, who proved similar results for GL(2) over the rationals. When p is not split and f is the base-change of a classical modular form F, we relate Lp to the L-invariant of F, resolving a conjecture of Trifkovi\'{c} in this case
Families of bianchi modular symbols: critical base-change p-adic L-functions and p-adic Artin formalism
Let be an imaginary quadratic field. In this article, we study the eigenvariety for , proving an etaleness result for the weight map at non-critical classical points and a smoothness result at base-change classical points. We give three main applications of this. (1) We construct three-variable -adic -functions over the eigenvariety interpolating the (two-variable) -adic -functions of classical Bianchi cusp forms in families. (2) Let be a -stabilised newform of weight at least 2 without CM by . We construct a two-variable -adic -function attached to the base-change of to under assumptions on that we conjecture always hold, in particular making no assumption on the slope of . (3) We prove that these base-change -adic -functions satisfy a -adic Artin formalism result, that is, they factorise in the same way as the classical -function under Artin formalism. In an appendix, Carl Wang-Erickson describes a base-change deformation functor and gives a characterisation of its Zariski tangent space
On -adic -functions for in finite slope Shalika families
Let be a prime number and be the Galois group of the
maximal abelian extension unramified outside of a totally real number
field of degree . Using automorphic cycles, we construct evaluation maps
on the parahoric overconvergent cohomology for in degree
, which allow us to attach a distribution on
of controlled growth to any finite slope overconvergent -eigenclass. When
the eigenclass comes from a non-critical refinement of a cuspidal
automorphic representation of which is spherical at
and admits a Shalika model, we prove this distribution interpolates all
Deligne-critical -values of , giving the first construction of -adic
-functions in this generality beyond the -ordinary setting. Further,
under some mild assumptions we use our evaluation maps to show that
belongs to a unique -dimensional Shalika family in a parabolic
eigenvariety for , and that this family is \'etale over the
weight space. Finally, under a hypothesis on the local Shalika models at bad
places which is empty for of level 1, we construct a -adic
-function for the family.Comment: 64 pages (inc. glossary of notation), comments welcome! Changes for
v2,v3: minor corrections and expositional improvement
Análisis de desempeño del Sistema Privado de Pensiones : un acercamiento desde la teoría de agencia
La presente investigación tiene por objetivo analizar el desempeño del Sistema Privado de
Pensiones desde su estructura organizacional. El referido sistema puede ser analizado de distintas
maneras, el presente trabajo lo evaluará desde dos perspectivas: la Teoría de Portafolio de
Markowitz y la Teoría de Agencia.
En el caso de la Teoría de Portafolio de Markowitz, ésta sirvió para analizar la eficiencia de las
decisiones de inversión tomadas por las AFP bajo determinados supuestos (sin restricciones, con
restricciones de liquidez y con restricciones legales). De esta forma, el modelo de Markowitz fue
utilizado para determinar portafolios óptimos bajo cada supuesto, para cada uno de los años y
cada uno de los tipos de fondos de pensiones (Fondo 1, 2 y 3). Con ello, se estimó la ineficiencia
o pérdida de rentabilidad causada por la iliquidez del mercado peruano y el marco regulatorio del
Sistema Privado de Pensiones (SPP). Luego, se comparó con la rentabilidad ajustada al riesgo de
las AFP y en donde se observó que ésta última rentabilidad se encuentra siempre por debajo de
las restricciones analizadas. Se concluyó, por lo tanto, que existen otros factores no considerados
que causan ineficiencia dentro del SPP.
En el caso de la Teoría de Agencia, ésta se utilizó para evaluar las decisiones tomadas por los
agentes del SPP (AFP y Estado) en favor de sus principales (los afiliados al SPP) desde la
perspectiva del problema de agencia. Es necesario indicar que este análisis se realiza de manera
exploratoria con la finalidad de poder encontrar algunas posibles explicaciones a las ineficiencias
encontradas con la primera teoría. De esta manera, se determinan los incentivos que tienen los
agentes del SPP, los posibles conflictos de interés, los costos de agencia, la posible pérdida
acumulada de riqueza para el afiliado al SPP, y finalmente, se realizó un análisis a profundidad
de un agente del SPP en un determinado accionar. Se concluyó que algunos agentes del SPP tienen
incentivos para afectar a los afiliados, tomando ventaja de su posición debido a la actual estructura
organizacional del SPP, y ello puede explicar las ineficiencias halladas en la aplicación del
modelo de Markowitz.Tesi
Families of Bianchi modular symbols : critical base-change p-adic L-functions and p-adic Artin formalism
Let K be an imaginary quadratic field. In this article, we study the eigenvariety for GL2/K, proving an étaleness result for the weight map at non-critical classical points and a smoothness result at base-change classical points. We give three main applications of this; let f be a p-stabilised newform of weight k≥2 without CM by K. Suppose f has finite slope at p and its base-change f/K to K is p-regular. Then: (1) We construct a two-variable p-adic L-function attached to f/K under assumptions on f that conjecturally always hold, in particular with no non-critical assumption on f/K. (2) We construct three-variable p-adic L-functions over the eigenvariety interpolating the p-adic L-functions of classical base-change Bianchi cusp forms. (3) We prove that these base-change p-adic L-functions satisfy a p-adic Artin formalism result, that is, they factorise in the same way as the classical L-function under Artin formalism.
In an appendix, Carl Wang-Erickson describes a base-change deformation functor and gives a characterisation of its Zariski tangent space
Exceptional zeros and L-invariants of Bianchi modular forms
Let f be a Bianchi modular form, that is, an automorphic form for GL2 over an imaginary quadratic field F. In this paper, we prove an exceptional zero conjecture in the case where f is new at a prime above p. More precisely, for each prime p of F above p we prove the existence of an Linvariant Lp, depending only on p and f, such that when the p-adic L-function of f has an exceptional zero at p, its derivative can be related to the classical L-value multiplied by Lp. The proof uses cohomological methods of Darmon and Orton, who proved similar results for GL2/Q. When p is not split and f is the base-change of a classical modular form f ˜, we relate Lp to the L-invariant of f ˜, resolving a conjecture of Trifkovi´c in this case.Postprint (author's final draft
Parabolic eigenvarieties via overconvergent cohomology
Let G be a connected reductive group over Q such that G = G/Qp is quasi-split, and let Q ⊂ G be a parabolic subgroup. We introduce parahoric overconvergent cohomology groups with respect to Q, and prove a classicality theorem showing that the small slope parts of these groups coincide with those of classical cohomology. This allows the use of overconvergent cohomology at parahoric, rather than Iwahoric, level, and provides flexible lifting theorems that appear to be particularly well-adapted to arithmetic applications. When Q is a Borel, we recover the usual theory of overconvergent cohomology, and our classicality theorem gives a stronger slope bound than in the existing literature. We use our theory to construct Q-parabolic eigenvarieties, which parametrise p-adic families of systems of Hecke eigenvalues that are finite slope at Q, but that allow infinite slope away from Q
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