24,495 research outputs found
Rankin-Selberg periods for spherical principal series
By the unfolding method, Rankin-Selberg L-functions for can be expressed in terms of period integrals. These
period integrals actually define invariant forms on tensor products of the
relevant automorphic representations. By the multiplicity-one theorems due to
Sun-Zhu and Chen-Sun such invariant forms are unique up to scalar multiples and
can therefore be related to invariant forms on equivalent principal series
representations. We construct meromorphic families of such invariant forms for
spherical principal series representations of and
conjecture that their special values at the spherical vectors agree in absolute
value with the archimedean local L-factors of the corresponding L-functions. We
verify this conjecture in several cases.
This work can be viewed as the first of two steps in a technique due to
Bernstein-Reznikov for estimating L-functions using their period integral
expressions.Comment: 25 pages. v3 replaces the previous versions which have a gap in Lemma
4.1 due to the non-co-compactness of the lattic
Novel Two-dimensional Carbon Allotrope with Strong Electronic Anisotropy
Two novel two-dimensional carbon allotropes comprised of octagons and
pentagons are proposed based on the first-principles calculations. The two
carbon allotropes, named OPG-L and OPG-Z, are found to have distinct
properties. OPG-L is metallic, while OPG-Z is a gapless semimetal. Remarkably,
OPG-Z exhibits pronounced electronic anisotropy with highly anisotropic Dirac
points at the Fermi level. A tight-binding model is suggested to describe the
low-energy quasiparticles, which clarifies the origin of the anisotropic Dirac
points. Such an anisotropic electronic characteristic of OPG-Z is expected to
have wide implications in nano-electronics.Comment: 6 pages, 5 figures (accepted by Physical Review B
Lower Limit on Dark Matter Production at the Large Hadron Collider
We evaluate the prospects for finding evidence of dark matter production at
the Large Hadron Collider. We consider WIMPs and superWIMPs, weakly- and
superweakly-interacting massive particles, and characterize their properties
through model-independent parameterizations. The observed relic density then
implies lower bounds on dark matter production rates as functions of a few
parameters. For WIMPs, the resulting signal is indistinguishable from
background. For superWIMPs, however, this analysis implies significant
production of metastable charged particles. For natural parameters, these rates
may far exceed Drell-Yan cross sections and yield spectacular signals.Comment: 4 pages, title changed, possibility of cross sections far above
Drell-Yan noted, published versio
To Be or Not To Be Humorous? Cross Cultural Perspectives on Humor
open access articleHumor seems to manifest differently in Western and Eastern cultures, although little is known about how culture shapes humor perceptions. The authors suggest that Westerners regard humor as a common and positive disposition; the Chinese regard humor as a special disposition particular to humorists, with controversial aspects. In Study 1, Hong Kong participants primed with Western culture evaluate humor more positively than they do when primed with Chinese culture. In Study 2a, Canadians evaluate humor as being more important in comparison with Chinese participants. In Study 2b, Canadians expect ordinary people to possess humor, while Chinese expect specialized comedians to be humorous. The implications and limitations are discussed
- …