Nevin Manimala

Phys Rev Lett. 2025 Feb 28;134(8):087102. doi: 10.1103/PhysRevLett.134.087102.

ABSTRACT

Celebrated fluctuation-dissipation theorem (FDT) linking the response function to time dependent correlations of observables measured in the reference unperturbed state is one of the central results in equilibrium statistical mechanics. In this Letter we discuss an extension of the standard FDT to the case when multidimensional matrix representing transition probabilities is strictly non-normal. This feature dramatically modifies the dynamics, by incorporating the effect of eigenvector nonorthogonality via the associated overlap matrix of Chalker-Mehlig type. In particular, the rate of entropy production per unit time is strongly enhanced by that matrix. We suggest, that this mechanism has an impact on the studies of collective phenomena in neural matrix models, leading, via transient behavior, to such phenomena as synchronization and emergence of the memory. We also expect, that the described mechanism generating the entropy production is generic for wide class of phenomena, where dynamics is driven by non-normal operators. For the case of driving by a large Ginibre matrix the entropy production rate is evaluated analytically, as well as for the Rajan-Abbott model for neural networks.

PMID:40085896 | DOI:10.1103/PhysRevLett.134.087102

Phys Rev Lett. 2025 Feb 28;134(8):087103. doi: 10.1103/PhysRevLett.134.087103.

ABSTRACT

Most experiments can only detect a set of coarse-grained clusters of a molecular system, while the internal microstates are often inaccessible. Here, based on an infinitely long coarse-grained trajectory, we obtain a set of sufficient statistics that extracts all statistic information of coarse-grained observations. Based on these sufficient statistics, we set up a theoretical framework of parameter inference and nonequilibrium identification for a general Markov network with an arbitrary number of microstates and arbitrary coarse-grained partitioning. Our framework can be used to identify whether the sufficient statistics are enough for empirical estimation of all unknown parameters and we can also provide a quantitative criterion that reveals nonequilibrium. Our nonequilibrium criterion generalizes the one obtained [J. Chem. Phys. 132, 041102 (2010)JCPSA60021-960610.1063/1.3294567] for a three-state system with two coarse-grained clusters and is capable of detecting a larger nonequilibrium region compared to the classical criterion based on autocorrelation functions.

PMID:40085894 | DOI:10.1103/PhysRevLett.134.087103

Phys Rev Lett. 2025 Feb 28;134(8):080803. doi: 10.1103/PhysRevLett.134.080803.

ABSTRACT

A fundamental limitation of quantum communication is that a single qubit can carry at most one bit of classical information. For an important class of quantum communication channels, known as entanglement breaking, this limitation holds even if the sender and receiver share entangled particles. But does this mean that, for the purpose of communicating classical messages, a noisy entanglement-breaking qubit channel can be replaced by a noisy bit channel? Here we answer the question in the negative. We introduce a game, similar to the Monty Hall problem in classical statistics, where a sender assists a receiver in finding a valuable item (the “prize”) hidden in one of four possible boxes, while avoiding a hazardous item (the “bomb”) hidden in one of the remaining three boxes. We show that no classical strategy using a noisy bit channel can ensure that the bomb is avoided, even if the sender and receiver share arbitrary amounts of randomness. In contrast, communication of a qubit through a class of noisy entanglement-breaking channels, which we call quantum not channels, allows the players to deterministically avoid the bomb and to find the prize with a guaranteed nonzero probability. Our findings show that the communication of classical messages through a noisy entanglement-breaking qubit channel assisted by quantum entanglement cannot, in general, be simulated by communication through a noisy bit channel assisted by classical correlations.

PMID:40085885 | DOI:10.1103/PhysRevLett.134.080803

Phys Rev Lett. 2025 Feb 28;134(8):081001. doi: 10.1103/PhysRevLett.134.081001.

ABSTRACT

The resonant conversion of cosmic microwave background (CMB) photons into axions within large-scale structure induces an anisotropic spectral distortion in CMB temperature maps. Applying state-of-the-art foreground cleaning techniques to Planck CMB observations, we construct maps of axion-induced “patchy screening” of the CMB. We cross-correlate these maps with data from the unWISE galaxy survey and find no evidence of axions. We constrain the axion-photon coupling, g_{aγγ}≲2×10^{-12} GeV^{-1}, at the 95% confidence level for axion masses in the range 10^{-13} eV≲m_{a}≲10^{-12} eV. These constraints are competitive with the tightest astrophysical axion limits in this mass range and are inferred from robust population-level statistics, which makes them complementary to existing searches that rely on modeling of individual systems.

PMID:40085882 | DOI:10.1103/PhysRevLett.134.081001

Phys Rev Lett. 2025 Feb 28;134(8):082304. doi: 10.1103/PhysRevLett.134.082304.

ABSTRACT

We propose a Bayesian inference estimation of in-medium modification of the cluster self-energies from light nuclei multiplicities measured in selected samples of central ^{136,124}Xe+^{124,112}Sn collisions with the INDRA apparatus. The data are interpreted with a relativistic quasiparticle cluster approach in the mean-field approximation without any prior assumption on the thermal parameters of the model. An excellent reproduction is obtained for H and He isotope multiplicities, and compatible posterior distributions are found for the unknown thermal parameters. We conclude that the cluster-σ-meson coupling is temperature dependent, becoming weaker when the temperature increases, in agreement with microscopic quantum statistical calculations. This implies a faster decrease of the light cluster abundances with temperature than previously estimated.

PMID:40085878 | DOI:10.1103/PhysRevLett.134.082304

Phys Rev Lett. 2025 Feb 28;134(8):081901. doi: 10.1103/PhysRevLett.134.081901.

ABSTRACT

The Ξ_{b}^{0(-)}→Ξ_{c}(3055)^{+(0)}(→D^{+(0)}Λ)π^{-} decay chains are observed, and the spin-parity of Ξ_{c}(3055)^{+(0)} baryons is determined for the first time. The measurement is performed using proton-proton collision data at a center-of-mass energy of sqrt[s]=13 TeV, corresponding to an integrated luminosity of 5.4 fb^{-1}, recorded by the LHCb experiment between 2016 and 2018. The spin-parity of the Ξ_{c}(3055)^{+(0)} baryons is determined to be 3/2^{+} with a significance of more than 6.5σ (3.5σ) compared to all other tested hypotheses. The up-down asymmetries of the Ξ_{b}^{0(-)}→Ξ_{c}(3055)^{+(0)}π^{-} transitions are measured to be -0.92±0.10±0.05 (-0.92±0.16±0.22), consistent with maximal parity violation, where the first uncertainty is statistical and the second is systematic. These results support the hypothesis that the Ξ_{c}(3055)^{+(0)} baryons correspond to the first D-wave λ-mode excitation of the Ξ_{c} flavor triplet.

PMID:40085858 | DOI:10.1103/PhysRevLett.134.081901

Phys Rev Lett. 2025 Feb 28;134(8):081804. doi: 10.1103/PhysRevLett.134.081804.

ABSTRACT

We report a search for neutrino oscillations to sterile neutrinos under a model with three active and one sterile neutrinos (3+1 model). This analysis uses the NOvA detectors exposed to the NuMI beam, running in neutrino mode. The data exposure, 13.6×10^{20} protons on target, doubles that previously analyzed by NOvA, and the analysis is the first to use ν_{μ} charged-current interactions in conjunction with neutral-current interactions. Neutrino samples in the near and far detectors are fitted simultaneously, enabling the search to be carried out over a Δm_{41}^{2} range extending 2 (3) orders of magnitude above (below) 1 eV^{2}. NOvA finds no evidence for active-to-sterile neutrino oscillations under the 3+1 model at 90% confidence level. New limits are reported in multiple regions of parameter space, excluding some regions currently allowed by IceCube at 90% confidence level. We additionally set the most stringent limits for anomalous ν_{τ} appearance for Δm_{41}^{2}≤3 eV^{2}.

PMID:40085856 | DOI:10.1103/PhysRevLett.134.081804

Anesthesiology. 2025 Mar 14. doi: 10.1097/ALN.0000000000005450. Online ahead of print.

ABSTRACT

BACKGROUND: Patient blood management (PBM) is a set of evidence-based practices that reduces the need for blood transfusions. However, its impact on relevant clinical outcomes remains unclear. We evaluated the association between adherence to guideline-recommended PBM care and 30-day postoperative complications in patients undergoing primary total knee and hip arthroplasty. Secondary outcomes included the length of hospital stay and red blood cell utilization.

METHODS: This was a retrospective, multicenter cohort study including patients from 43 hospitals. The PBM clinical pathway comprised nine major guideline-recommended interventions, and adherence was assessed using a composite quality indicator. Multilevel multivariable regression models were used to evaluate the associations between PBM adherence and outcomes at the patient level while accounting for hospital characteristics and hospital variation.

RESULTS: A total of 30926 patients who underwent primary total knee or hip arthroplasty between 2016 and 2022 at 43 hospitals were included. Of these, 1335 (4.3%) had 30-day postoperative complications. The median adherence to the PBM clinical pathway was 60.%. Higher PBM adherence was associated with fewer 30-day postoperative complications (adjusted odds ratio, 0.43; 95% confidence interval (CI) 0.32 to 0.58; p < 0.001), including 65% lower odds of major adverse cardiac events and 45% lower odds of infection. Additionally, higher adherence was associated with shorter hospital stays (adjusted incidence rate ratio, 0.77; 95% CI 0.76 to 0.79; p < 0.001) and reduced transfusion rates (adjusted odds ratio, 0.11; 95% CI 0.09 to 0.14; p < 0.001). Sensitivity analyses confirmed these associations.

CONCLUSIONS: Adherence to the PBM clinical pathway was associated with improved outcomes. While causality cannot be established, these findings support the potential effectiveness of PBM in reducing postoperative complications and its efficiency in shortening hospital stays, beyond minimizing blood transfusions, in patients undergoing knee and hip arthroplasty.

PMID:40085850 | DOI:10.1097/ALN.0000000000005450

JMIR Res Protoc. 2025 Mar 14;14:e63230. doi: 10.2196/63230.

ABSTRACT

BACKGROUND: Exacerbations of chronic obstructive pulmonary disease (COPD) are one of the main causes of mortality, and early detection of exacerbations is thus essential. Telemedicine solutions have shown promising results for the detection of exacerbations in COPD and have increasingly been used. However, the effect of telemedicine is divergent. According to several studies, respiration rate (RR) increases before, during, and after an exacerbation and the change is measurable with several contactless devices. Despite this, RR is rarely measured, and telemedicine solutions only use wearable devices for measuring RR, even though wearable respiratory monitoring devices have been associated with certain drawbacks. Contactless devices are often used during sleep, as measurements conducted during sleep minimize the risk of disturbance from physical activities. However, the potential of measuring RR and heart rate (HR) during sleep for the detection of exacerbations in COPD remains unclear.

OBJECTIVE: The aim of this observational study is to investigate whether contactless measurement of RR, HR, and sleep stages can be used to detect exacerbations in people with COPD.

METHODS: An observational study including 50 participants with COPD will be conducted. The participants reside in Aalborg municipality, located in the North Denmark Region. Participants will use a contactless monitor (Sleepiz One+) near their bed during sleep for a period of 4 months. After data collection, descriptive statistics will be used to identify any extremes or variations in RR, HR, or sleep stages in the nights preceding an exacerbation. Correlation analysis will be performed to evaluate the relationship between the number of exacerbations and extremes or variations in RR, HR, or sleep stages. Finally, qualitative interviews will be conducted with 12 participants to explore their experiences of sleeping with the monitor nearby.

RESULTS: Recruitment started at the end of April 2024. A total of 12 participants have been recruited, and the remaining participants are expected to be recruited during March and April 2025. Six out of 12 participants have completed the data collection and qualitative interview stages. Overall data collection is expected to be completed by September 2025. The results are expected to provide insight into the potential for identifying extremes or variations in RR, HR, or sleep stages in the days preceding an exacerbation. Additionally, the results are expected to assess the correlation between the number of exacerbations and extremes or variations in RR, HR, and sleep stages.

CONCLUSIONS: The findings from this study may clarify the possibility of using a contactless monitor to detect exacerbations in COPD. Furthermore, the results may have the potential to improve the ability to predict exacerbations in the future.

INTERNATIONAL REGISTERED REPORT IDENTIFIER (IRRID): DERR1-10.2196/63230.

PMID:40085848 | DOI:10.2196/63230

J Med Internet Res. 2025 Mar 14;27:e64249. doi: 10.2196/64249.

ABSTRACT

BACKGROUND: The emergence of eHealth services could contribute to improving individuals’ quality of life by optimizing effective and efficient care. However, various challenges might limit some older adults’ use of eHealth services.

OBJECTIVE: This study aimed to understand the perspectives of older adults (aged ≥65 years) of different backgrounds regarding eHealth services. We explored the experiences of Iranian immigrant and nonimmigrant older adults with eHealth services to identify their perceived challenges, emotions, and wishes. Immigrants face more challenges, and there is a need to understand their perspectives in addition to those of nonimmigrants. Iranians are one important immigrant group, as their number is limited and their specific needs are less well understood compared to those of the bigger immigrant groups.

METHODS: This study used a qualitative explorative research design. Semistructured interviews were conducted between February 2023 and May 2023. The participants were 25 older adults: nonimmigrants residing in cities (n=8, 32%), nonimmigrants residing in rural areas (n=9, 36%), and Iranian immigrants residing in cities (n=8, 32%). Data were analyzed through inductive and deductive content analysis and interpreted through self-determination theory.

RESULTS: Interacting with eHealth services was challenging for some older adults. They perceived several difficulties, with the most obvious ones being related to values and preferences, as some older adults did not value eHealth services (16/25, 64%), had insufficient digital skills (15/25, 60%), and experienced usability issues (15/25, 60%). The first two challenges were more pronounced among immigrants. In contrast, nonimmigrants from cities, being more familiar with the services, shared more usability issues. These identified challenges prevented older adults from satisfying their basic psychological needs of being competent and autonomous users and having a sense of belonging (aspects of self-determination theory), which were the main source of negative emotions. A common negative feeling was confusion (16/25, 64%) among those with limited experience using smart devices and those with poor self-reported digital skills. Conversely, older adults’ interaction with eHealth services generated positive emotions that were connected to the satisfaction of their basic psychological needs. Being interested in using eHealth services was a common feeling among most participants regardless of their background and was connected to satisfying their need for being competent and autonomous. The positive emotions could be supported by applying older adults’ needs to the design of eHealth services (10/25, 40%) and by supporting their digital skills (19/25, 76%).

CONCLUSIONS: Some older adults value eHealth services and see their added benefits. However, various challenges limit their use of these services. The analysis of older adults’ needs yielded several practical ideas that could improve the user-friendliness of the services and highlighted the importance of sufficient support services tailored to the cultural needs of specific groups of older adults.

PMID:40085846 | DOI:10.2196/64249