3,582 research outputs found
4D-XY quantum criticality in a doped Mott insulator
A new phenomenology is proposed for the superfluid density of strongly
underdoped cuprate superconductors based on recent data for ultra-clean single
crystals of YBCO. The data feature a puzzling departure from Uemura scaling and
a decline of the slope as the T_c = 0 quantum critical point is approached. We
show that this behavior can be understood in terms of the renormalization of
quasiparticle effective charge by quantum fluctuations of the superconducting
phase as described by a (3+1)-dimensional XY model. We calculate the
renormalization of the superfluid density and its slope, explain the new
phenomenology, and predict its eventual demise close to the QCP.Comment: Version published in PRL. For additional info and related work visit
http://www.physics.ubc.ca/~fran
Finiteness in derived categories of local rings
New homotopy invariant finiteness conditions on modules over commutative
rings are introduced, and their properties are studied systematically. A number
of finiteness results for classical homological invariants like flat dimension,
injective dimension, and Gorenstein dimension, are established. It is proved
that these specialize to give results concerning modules over complete
intersection local rings. A noteworthy feature is the use of techniques based
on thick subcategories of derived categories.Comment: 40 pages. Minor revisions. To appear in Commentarii Math. Helvetic
DG algebras with exterior homology
We study differential graded algebras whose homology is an exterior algebra
over a commutative ring R on a generator of degree n, and also certain types of
differential modules over these DGAs. We obtain a complete classification when
R is the integers, or the prime field of characteristic p>0, and n is greater
than or equal to -1. The examples are unexpectedly interesting.Comment: 15 page
On a Characium growing on Anopheles larvae
This article does not have an abstract
Magnetic field effects on and the pseudogap onset temperature in cuprate superconductors
We study the sensitivity of and the pseudogap onset temperature,
, to low fields, , for cuprate superconductors, using a BCS-based
approach extended to arbitrary coupling. We find that and , which
are of the same superconducting origin, have very different dependences.
The small coherence length makes rather insensitive to the field.
However, the presence of the pseudogap at makes more sensitive to
. Our results for the coherence length fit well with existing
experiments. We predict that very near the insulator will rapidly
increase.Comment: 4 pages, 1 figure, contribution to the PPHMF-IV conference, Oct. 200
Information Diffusion Power of Political Party Twitter Accounts During Japan's 2017 Election
In modern election campaigns, political parties utilize social media to
advertise their policies and candidates and to communicate to electorates. In
Japan's latest general election in 2017, the 48th general election for the
Lower House, social media, especially Twitter, was actively used. In this
paper, we perform a detailed analysis of social graphs and users who retweeted
tweets of political parties during the election. Our aim is to obtain accurate
information regarding the diffusion power for each party rather than just the
number of followers. The results indicate that a user following a user who
follows a political party account tended to also follow the account. This means
that it does not increase diversity because users who follow each other tend to
share similar values. We also find that followers of a specific party
frequently retweeted the tweets. However, since users following the user who
follow a political party account are not diverse, political parties delivered
the information only to a few political detachment users.Comment: The 10th International Conference on Social Informatics (SocInfo
2018
Emergence of the stochastic resonance in glow discharge plasma
stochastic resonance, glow discharge plasma, excitable medium, absolute mean
differenceComment: St
Contributions to our knowledge of South Indian Algae-VIII
This article does not have an abstract
Ecballocystopsis indica n. gen. et sp., a new member of Chlorodendrales
This article does not have an abstract
Fritschiella, a new terrestrial member of the chaetophoraceae
This article does not have an abstract
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