Bounds on Hecke eigenvalues
Let $pi$ be an automorphic representation of a certain general linear group $GL(k)$. Write its L-function as
$$L(s,pi) = sum_{n>0} frac{lambda(n)}{n^s}$$
for $Re(s) gg 1$. What is the best known bound (without assuming Ramanujan-Petersson) for $lambda(n)$?
number-theory automorphic-forms
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Let $pi$ be an automorphic representation of a certain general linear group $GL(k)$. Write its L-function as
$$L(s,pi) = sum_{n>0} frac{lambda(n)}{n^s}$$
for $Re(s) gg 1$. What is the best known bound (without assuming Ramanujan-Petersson) for $lambda(n)$?
number-theory automorphic-forms
add a comment |
Let $pi$ be an automorphic representation of a certain general linear group $GL(k)$. Write its L-function as
$$L(s,pi) = sum_{n>0} frac{lambda(n)}{n^s}$$
for $Re(s) gg 1$. What is the best known bound (without assuming Ramanujan-Petersson) for $lambda(n)$?
number-theory automorphic-forms
Let $pi$ be an automorphic representation of a certain general linear group $GL(k)$. Write its L-function as
$$L(s,pi) = sum_{n>0} frac{lambda(n)}{n^s}$$
for $Re(s) gg 1$. What is the best known bound (without assuming Ramanujan-Petersson) for $lambda(n)$?
number-theory automorphic-forms
number-theory automorphic-forms
asked Nov 27 at 8:13
TheStudent
1886
1886
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Let $pi$ be a cuspidal unitary automorphic representation of $mathrm{GL}_n(mathbb{A}_F)$, where $mathbb{A}_F$ denotes the ring of adèles of an algebraic number field $F$. Then
[L(s,pi) = sum_{substack{mathfrak{a} subset mathcal{O}_F \ mathfrak{a} neq {0}}} frac{lambda_{pi}(mathfrak{a})}{N_{F/mathbb{Q}}(mathfrak{a})^s}]
converges absolutely for $Re(s) > 1$. For $mathfrak{a}$ a prime ideal $mathfrak{p}$, we have that
[lambda_{pi}(mathfrak{p}) = alpha_{pi,1}(mathfrak{p}) + cdots + alpha_{pi,n}(mathfrak{p})]
for some complex numbers $alpha_{pi,1}(mathfrak{p}), ldots, alpha_{pi,n}(mathfrak{p})$; these are known as the Satake parameters of $pi$ at $mathfrak{p}$. It is known that the product of the Satake parameters has absolute value $1$ (more precisely, the product is the central character) if $pi$ is unramified at $mathfrak{p}$, and otherwise it is smaller.
For $n = 1$, this means that the Ramanujan hypothesis holds. For $n = 2$, the best bound is $|alpha_{pi,1}(mathfrak{p})|, |alpha_{pi,2}(mathfrak{p})| leq 7/64$ (for $F = mathbb{Q}$, this is due to Kim and Sarnak; for arbitrary $F$, this is due to Blomer and Brumley). Similarly, for $n = 3$, we have the bound $5/14$, and for $n = 4$, we have the bound $9/22$.
In general, it is not hard to show the inequality $|alpha_{pi,1}(mathfrak{p})|, ldots, |alpha_{pi,n}(mathfrak{p})| < 1/2$ (I think this goes back to Jacquet and Shalika). The best that is known now is the bound $frac{1}{2} - frac{1}{n^2 + 1}$, due to Luo, Rudnick, and Sarnak.
Some good references are these two papers.
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1 Answer
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1 Answer
1
active
oldest
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active
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active
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Let $pi$ be a cuspidal unitary automorphic representation of $mathrm{GL}_n(mathbb{A}_F)$, where $mathbb{A}_F$ denotes the ring of adèles of an algebraic number field $F$. Then
[L(s,pi) = sum_{substack{mathfrak{a} subset mathcal{O}_F \ mathfrak{a} neq {0}}} frac{lambda_{pi}(mathfrak{a})}{N_{F/mathbb{Q}}(mathfrak{a})^s}]
converges absolutely for $Re(s) > 1$. For $mathfrak{a}$ a prime ideal $mathfrak{p}$, we have that
[lambda_{pi}(mathfrak{p}) = alpha_{pi,1}(mathfrak{p}) + cdots + alpha_{pi,n}(mathfrak{p})]
for some complex numbers $alpha_{pi,1}(mathfrak{p}), ldots, alpha_{pi,n}(mathfrak{p})$; these are known as the Satake parameters of $pi$ at $mathfrak{p}$. It is known that the product of the Satake parameters has absolute value $1$ (more precisely, the product is the central character) if $pi$ is unramified at $mathfrak{p}$, and otherwise it is smaller.
For $n = 1$, this means that the Ramanujan hypothesis holds. For $n = 2$, the best bound is $|alpha_{pi,1}(mathfrak{p})|, |alpha_{pi,2}(mathfrak{p})| leq 7/64$ (for $F = mathbb{Q}$, this is due to Kim and Sarnak; for arbitrary $F$, this is due to Blomer and Brumley). Similarly, for $n = 3$, we have the bound $5/14$, and for $n = 4$, we have the bound $9/22$.
In general, it is not hard to show the inequality $|alpha_{pi,1}(mathfrak{p})|, ldots, |alpha_{pi,n}(mathfrak{p})| < 1/2$ (I think this goes back to Jacquet and Shalika). The best that is known now is the bound $frac{1}{2} - frac{1}{n^2 + 1}$, due to Luo, Rudnick, and Sarnak.
Some good references are these two papers.
add a comment |
Let $pi$ be a cuspidal unitary automorphic representation of $mathrm{GL}_n(mathbb{A}_F)$, where $mathbb{A}_F$ denotes the ring of adèles of an algebraic number field $F$. Then
[L(s,pi) = sum_{substack{mathfrak{a} subset mathcal{O}_F \ mathfrak{a} neq {0}}} frac{lambda_{pi}(mathfrak{a})}{N_{F/mathbb{Q}}(mathfrak{a})^s}]
converges absolutely for $Re(s) > 1$. For $mathfrak{a}$ a prime ideal $mathfrak{p}$, we have that
[lambda_{pi}(mathfrak{p}) = alpha_{pi,1}(mathfrak{p}) + cdots + alpha_{pi,n}(mathfrak{p})]
for some complex numbers $alpha_{pi,1}(mathfrak{p}), ldots, alpha_{pi,n}(mathfrak{p})$; these are known as the Satake parameters of $pi$ at $mathfrak{p}$. It is known that the product of the Satake parameters has absolute value $1$ (more precisely, the product is the central character) if $pi$ is unramified at $mathfrak{p}$, and otherwise it is smaller.
For $n = 1$, this means that the Ramanujan hypothesis holds. For $n = 2$, the best bound is $|alpha_{pi,1}(mathfrak{p})|, |alpha_{pi,2}(mathfrak{p})| leq 7/64$ (for $F = mathbb{Q}$, this is due to Kim and Sarnak; for arbitrary $F$, this is due to Blomer and Brumley). Similarly, for $n = 3$, we have the bound $5/14$, and for $n = 4$, we have the bound $9/22$.
In general, it is not hard to show the inequality $|alpha_{pi,1}(mathfrak{p})|, ldots, |alpha_{pi,n}(mathfrak{p})| < 1/2$ (I think this goes back to Jacquet and Shalika). The best that is known now is the bound $frac{1}{2} - frac{1}{n^2 + 1}$, due to Luo, Rudnick, and Sarnak.
Some good references are these two papers.
add a comment |
Let $pi$ be a cuspidal unitary automorphic representation of $mathrm{GL}_n(mathbb{A}_F)$, where $mathbb{A}_F$ denotes the ring of adèles of an algebraic number field $F$. Then
[L(s,pi) = sum_{substack{mathfrak{a} subset mathcal{O}_F \ mathfrak{a} neq {0}}} frac{lambda_{pi}(mathfrak{a})}{N_{F/mathbb{Q}}(mathfrak{a})^s}]
converges absolutely for $Re(s) > 1$. For $mathfrak{a}$ a prime ideal $mathfrak{p}$, we have that
[lambda_{pi}(mathfrak{p}) = alpha_{pi,1}(mathfrak{p}) + cdots + alpha_{pi,n}(mathfrak{p})]
for some complex numbers $alpha_{pi,1}(mathfrak{p}), ldots, alpha_{pi,n}(mathfrak{p})$; these are known as the Satake parameters of $pi$ at $mathfrak{p}$. It is known that the product of the Satake parameters has absolute value $1$ (more precisely, the product is the central character) if $pi$ is unramified at $mathfrak{p}$, and otherwise it is smaller.
For $n = 1$, this means that the Ramanujan hypothesis holds. For $n = 2$, the best bound is $|alpha_{pi,1}(mathfrak{p})|, |alpha_{pi,2}(mathfrak{p})| leq 7/64$ (for $F = mathbb{Q}$, this is due to Kim and Sarnak; for arbitrary $F$, this is due to Blomer and Brumley). Similarly, for $n = 3$, we have the bound $5/14$, and for $n = 4$, we have the bound $9/22$.
In general, it is not hard to show the inequality $|alpha_{pi,1}(mathfrak{p})|, ldots, |alpha_{pi,n}(mathfrak{p})| < 1/2$ (I think this goes back to Jacquet and Shalika). The best that is known now is the bound $frac{1}{2} - frac{1}{n^2 + 1}$, due to Luo, Rudnick, and Sarnak.
Some good references are these two papers.
Let $pi$ be a cuspidal unitary automorphic representation of $mathrm{GL}_n(mathbb{A}_F)$, where $mathbb{A}_F$ denotes the ring of adèles of an algebraic number field $F$. Then
[L(s,pi) = sum_{substack{mathfrak{a} subset mathcal{O}_F \ mathfrak{a} neq {0}}} frac{lambda_{pi}(mathfrak{a})}{N_{F/mathbb{Q}}(mathfrak{a})^s}]
converges absolutely for $Re(s) > 1$. For $mathfrak{a}$ a prime ideal $mathfrak{p}$, we have that
[lambda_{pi}(mathfrak{p}) = alpha_{pi,1}(mathfrak{p}) + cdots + alpha_{pi,n}(mathfrak{p})]
for some complex numbers $alpha_{pi,1}(mathfrak{p}), ldots, alpha_{pi,n}(mathfrak{p})$; these are known as the Satake parameters of $pi$ at $mathfrak{p}$. It is known that the product of the Satake parameters has absolute value $1$ (more precisely, the product is the central character) if $pi$ is unramified at $mathfrak{p}$, and otherwise it is smaller.
For $n = 1$, this means that the Ramanujan hypothesis holds. For $n = 2$, the best bound is $|alpha_{pi,1}(mathfrak{p})|, |alpha_{pi,2}(mathfrak{p})| leq 7/64$ (for $F = mathbb{Q}$, this is due to Kim and Sarnak; for arbitrary $F$, this is due to Blomer and Brumley). Similarly, for $n = 3$, we have the bound $5/14$, and for $n = 4$, we have the bound $9/22$.
In general, it is not hard to show the inequality $|alpha_{pi,1}(mathfrak{p})|, ldots, |alpha_{pi,n}(mathfrak{p})| < 1/2$ (I think this goes back to Jacquet and Shalika). The best that is known now is the bound $frac{1}{2} - frac{1}{n^2 + 1}$, due to Luo, Rudnick, and Sarnak.
Some good references are these two papers.
answered Nov 27 at 10:30
Peter Humphries
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2,38511022
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