Tootfinder

Optimized cerebral blood flow measurement in speckle contrast optical spectroscopy via refinement of noise calibration
Ninghe Liu, Yu Xi Huang, Simon Mahler, Changhuei Yang
https://arxiv.org/abs/2506.15843

Optimized cerebral blood flow measurement in speckle contrast optical spectroscopy via refinement of noise calibration
Speckle contrast optical spectroscopy (SCOS) offers a non-invasive and cost-effective method for monitoring cerebral blood flow (CBF). However, extracting accurate CBF from SCOS necessitates precise noise pre-calibration. Errors from this can degrade CBF measurement fidelity, particularly when the overall signal level is low. Such errors primarily stem from residual speckle contrast associated with camera and shot noise, whose fluctuations exhibit a temporal structure that mimics cerebral blood…

When I find it discouraging that young twenty-somethings often don’t seem to care about these things, it’s good for me to remember that I care a lot now, but I really don’t even remember these giant protests from when I was a young twenty-something.
I do remember talking with people and saying things like “going to war without actual evidence—just GWB saying stuff—is stupid” and being shot down by older folks.
But I really don’t remember most of the political action.

Dare Obasanjo (@carnage4life@mas.to)
Attached: 1 image Gen Z is about to experience the futility of protests that Gen X experienced 22 years ago. The way to create change is voting. Protesting is just slightly above writing mean tweets in influencing U.S. government policy. Slightly.

On the Existence and Uniqueness of Symmetric Structures Generating Complete Ordered Pairs
Nicol\'as Agust\'in Mart\'inez
https://arxiv.org/abs/2506.16414

On the Existence and Uniqueness of Symmetric Structures Generating Complete Ordered Pairs
This work introduces a new class of symmetric matrix structures, called harmonic structures, which enable the generation of all possible directed transitions $(x_i, x_{i+1})$ over a set of $n$ symbols, without internal repetitions. Unlike other combinatorial constructions, these structures are defined solely by the relative positions of the elements, not their concrete values. Two structures are considered equivalent if one can be obtained from the other through row permutation and/or global re…

R&D-Agent-Quant: A Multi-Agent Framework for Data-Centric Factors and Model Joint Optimization
Yuante Li, Xu Yang, Xiao Yang, Minrui Xu, Xisen Wang, Weiqing Liu, Jiang Bian
https://arxiv.org/abs/2505.15155

R&D-Agent-Quant: A Multi-Agent Framework for Data-Centric Factors and Model Joint Optimization
Financial markets pose fundamental challenges for asset return prediction due to their high dimensionality, non-stationarity, and persistent volatility. Despite advances in large language models and multi-agent systems, current quantitative research pipelines suffer from limited automation, weak interpretability, and fragmented coordination across key components such as factor mining and model innovation. In this paper, we propose R&D-Agent for Quantitative Finance, in short RD-Agent(Q), the fi…

On the theory of supermodulation of the superconducting order parameter by supermodulation of the apex distance in optimally doped Bi$_2$Sr$_2$CaCu$_2$O$_{8 x}$
Albert M. Varonov, Todor M. Mishonov
https://arxiv.org/abs/2506.15726

On the theory of supermodulation of the superconducting order parameter by supermodulation of the apex distance in optimally doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+x}$
Recently using Scanning Josephson Tunneling Microscopy (SJTM) in the group of Séamus Davis a super-modulation of the superconducting order parameter induced by super-modulation of the distance $δ$ between planar Cu and apical O was observed in [O'Mahony et al, On the electron pairing mechanism of copper-oxide high temperature superconductivity, PNAS Vol. 119(37), e2207449119 (2022)]. The authors conclude: "concurrence of prediction from strong correlation theory... with these observations ind…

Approximating Language Model Training Data from Weights
John X. Morris, Junjie Oscar Yin, Woojeong Kim, Vitaly Shmatikov, Alexander M. Rush
https://arxiv.org/abs/2506.15553

Approximating Language Model Training Data from Weights
Modern language models often have open weights but closed training data. We formalize the problem of data approximation from model weights and propose several baselines and metrics. We develop a gradient-based approach that selects the highest-matching data from a large public text corpus and show its effectiveness at recovering useful data given only weights of the original and finetuned models. Even when none of the true training data is known, our method is able to locate a small subset of p…

POPQC: Parallel Optimization for Quantum Circuits (Extended Version)
Pengyu Liu, Jatin Arora, Mingkuan Xu, Umut A. Acar
https://arxiv.org/abs/2506.13720 ht…

POPQC: Parallel Optimization for Quantum Circuits (Extended Version)
Optimization of quantum programs or circuits is a fundamental problem in quantum computing and remains a major challenge. State-of-the-art quantum circuit optimizers rely on heuristics and typically require superlinear, and even exponential, time. Recent work proposed a new approach that pursues a weaker form of optimality called local optimality. Parameterized by a natural number $Ω$, local optimality insists that each and every $Ω$-segment of the circuit is optimal with respect to an extern…

Some $q$-transformation formulas and Rogers-Ramanujan type identities
Chang Xu, Dunkun Yang
https://arxiv.org/abs/2506.16711 https://…

Some $q$-transformation formulas and Rogers-Ramanujan type identities
In this paper, we explore the role that Liu's transformation formula can play in discovering Rogers-Ramanujan type identities. Specifically, we combine Liu's transformation formula with other $q$-series summations to derive a series of parameterized identities. Thereafter, through careful selection of these parameters, we obtain $75$ Rogers-Ramanujan type identities from Slater's list, and uncover several new Rogers-Ramanujan type identities.

Explicit construction of benign subgroup for Higman's reversing operation
V. H. Mikaelian
https://arxiv.org/abs/2506.12442 https://

Explicit construction of benign subgroup for Higman's reversing operation
For the Higman reversing operation $ρ$ and for a set of integer-valued functions $\mathcal X$ the following has been proved. Let the subgroup $A_{\mathcal X}$ be benign in the free group $F$, let the respective finitely presented overgroup $K_{\mathcal X}$ with its finitely generated subgroup $L_{\mathcal X}$ be given for $A_{\mathcal X}$ explicitly, and let the set $\mathcal Y = ρ\mathcal X$ be obtained from $\mathcal X$ by the reversing operation $ρ$. Then $A_{\mathcal Y}$ also is benign i…

Observing the Birth of Rydberg Exciton Fermi Polarons on a Moire Fermi Sea
Eric A. Arsenault, Gillian E. Minarik, Jiaqi Cai, Minhao He, Yiliu Li, Takashi Taniguchi, Kenji Watanabe, Dmitri Basov, Matthew Yankowitz, Xiaodong Xu, X. -Y. Zhu
https://arxiv.org/abs/2506.13683

Observing the Birth of Rydberg Exciton Fermi Polarons on a Moire Fermi Sea
The optical spectra of two-dimensional (2D) semiconductors are dominated by tightly bound excitons and trions. In the low doping limit, trions are often described as three-body quasiparticles consisting of two electrons and one hole or vice versa. However, trions are more rigorously understood as quasiparticles arising from the interaction between an exciton and excitation of the Fermi sea - referred to as exciton Fermi polaron. Here we employ pump-probe spectroscopy to directly observe the for…