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disable Artin L-functions with large conductor/degree #5627

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merged 2 commits into from
Aug 9, 2023
Merged

disable Artin L-functions with large conductor/degree #5627

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3ed405b
disable Artin L-functions with large conductor/degree
edgarcosta Aug 4, 2023
5f68cb3
comment to clarify where the threshold comes from
edgarcosta Aug 4, 2023
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10 changes: 9 additions & 1 deletion lmfdb/lfunctions/Lfunction.py
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,8 @@
)
import sage.libs.lcalc.lcalc_Lfunction as lc

from lmfdb.app import is_debug_mode

from lmfdb.backend.encoding import Json
from lmfdb.utils import (
Downloader,
Expand Down Expand Up @@ -1254,6 +1256,12 @@ def __init__(self, **args):
self.primitive = self.artin.primitive()
self.degree = self.artin.dimension()
self.level = self.artin.conductor()

# disable expensive L-functions, these should not be linked anywhere regardless
# this threshold comes from lmfdb/artin_representations/main.py
if not is_debug_mode() and self.level**self.degree > 729000000000000:
raise ValueError(f'Error constructing L-function for the Artin representation {self.origin_label}, as the conductor/degree is too large.')

self.level_factored = factor(self.level)
self.mu_fe = self.artin.mu_fe()
self.nu_fe = self.artin.nu_fe()
Expand Down Expand Up @@ -1320,7 +1328,7 @@ def __init__(self, **args):
# Check for compulsory arguments
if "t" in args and "family" in args:
args["label"] = args["family"] + "_" + args["t"]
validate_required_args ('Unable to construct hypergeometric motive L-function.', args, 'label')
validate_required_args('Unable to construct hypergeometric motive L-function.', args, 'label')
self._Ltype = "hgmQ"

# Put the arguments into the object dictionary
Expand Down