240 research outputs found
Higher Rank Wilson Loops in N = 2* Super-Yang-Mills Theory
The N=2* Super-Yang-Mills theory (SYM*) undergoes an infinite sequence of
large-N quantum phase transitions. We compute expectation values of Wilson
loops in k-symmetric and antisymmetric representations of the SU(N) gauge group
in this theory and show that the same phenomenon that causes the phase
transitions at finite coupling leads to a non-analytic dependence of Wilson
loops on k/N when the coupling is strictly infinite, thus making the
higher-representation Wilson loops ideal holographic probes of the non-trivial
phase structure of SYM*.Comment: 33 pages, 6 figures. v2: a new reference adde
Notes on a non-thermal fluctuation-dissipation relation in quantum Brownian motion
We review how unitarity and stationarity in the Schwinger-Keldysh formalism
naturally lead to a (quantum) generalized fluctuation-dissipation relation
(gFDR) that works beyond thermal equilibrium. Non-Gaussian loop corrections are
also presented. Additionally, we illustrate the application of this gFDR in
various scenarios related to quantum Brownian motion and the generalized
Langevin equation.Comment: 24 pages, 9 figure
N=2* Super-Yang-Mills Theory at Strong Coupling
The planar N=2* Super-Yang-Mills (SYM) theory is solved at large 't Hooft
coupling using localization on S(4). The solution permits detailed
investigation of the resonance phenomena responsible for quantum phase
transitions in infinite volume, and leads to quantitative predictions for the
semiclassical string dual of the N=2* theory.Comment: 34 pages, 9 figures; v2: the name of one author change
Test for rare variants by environment interactions in sequencing association studies
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/142484/1/biom12368_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/142484/2/biom12368.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/142484/3/biom12368-sup-0001-SuppData.pd
Acne and risk of mental disorders: A two-sample Mendelian randomization study based on large genome-wide association data
BackgroundDespite a growing body of evidence that acne impacts mental disorders, the actual causality has not been established for the possible presence of recall bias and confounders in observational studies.MethodsWe performed a two-sample Mendelian randomization (MR) analysis to evaluate the effect of acne on the risk of six common mental disorders, i.e., depression, anxiety, schizophrenia, obsessive–compulsive disorder (OCD), bipolar disorder, and post-traumatic stress disorder (PTSD). We acquired genetic instruments for assessing acne from the largest genome-wide association study (GWAS) of acne (N = 615,396) and collected summary statistics from the largest available GWAS for depression (N = 500,199), anxiety (N = 17,310), schizophrenia (N = 130,644), OCD (N = 9,725), bipolar disorder (N = 413,466), and PTSD (N = 174,659). Next, we performed the two-sample MR analysis using four methods: inverse-variance weighted method, MR-Egger, weighted median, and MR pleiotropy residual sum and outliers. Sensitivity analysis was also performed for heterogeneity and pleiotropy tests.ResultsThere was no evidence of a causal impact of acne on the risk of depression [odds ratio (OR): 1.002, p = 0.874], anxiety (OR: 0.961, p = 0.49), OCD (OR: 0.979, p = 0.741), bipolar disorder (OR: 0.972, p = 0.261), and PTSD (OR: 1.054, p = 0.069). Moreover, a mild protective effect of acne against schizophrenia was observed (OR: 0.944; p = 0.033).ConclusionThe increased prevalence of mental disorders observed in patients with acne in clinical practice was caused by modifiable factors, and was not a direct outcome of acne. Therefore, strategies targeting the elimination of potential factors and minimization of the occurrence of adverse mental events in acne should be implemented
SiRA: Sparse Mixture of Low Rank Adaptation
Parameter Efficient Tuning has been an prominent approach to adapt the Large
Language Model to downstream tasks. Most previous works considers adding the
dense trainable parameters, where all parameters are used to adapt certain
task. We found this less effective empirically using the example of LoRA that
introducing more trainable parameters does not help. Motivated by this we
investigate the importance of leveraging "sparse" computation and propose SiRA:
sparse mixture of low rank adaption. SiRA leverages the Sparse Mixture of
Expert(SMoE) to boost the performance of LoRA. Specifically it enforces the top
experts routing with a capacity limit restricting the maximum number of
tokens each expert can process. We propose a novel and simple expert dropout on
top of gating network to reduce the over-fitting issue. Through extensive
experiments, we verify SiRA performs better than LoRA and other mixture of
expert approaches across different single tasks and multitask settings
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