Results 71 to 80 of about 228,440 (334)

Roles of boundary and equation-of-motion terms in cosmological correlation functions

Physics Letters B
We revisit the properties of total time-derivative terms as well as terms proportional to the free equation of motion (EOM) in a Schwinger-Keldysh formalism. They are relevant to the correct calculation of correlation functions of curvature perturbations
Ryodai Kawaguchi, Shinji Tsujikawa, Yusuke Yamada   +2 more
doaj   +1 more source

Path integral formalism for the free Dirac propagator in spherical coordinates [PDF]

, 2023
Sreya Banerjee, Zoltán Harman
openalex   +1 more source

Three‐Dimensional Hierarchical Nanowire‐Networks with Deep‐Focus Tolerance and Adhesion Robustness for Harsh‐Environment SERS Sensing

Advanced Functional Materials, EarlyView.
A 3D nanowire‐network SERS substrate with robust adhesion is developed, featuring pronounced z‐direction optical activity, ultralow detection limit (1.5 × 10−13 M), and excellent signal uniformity (RSD < 10%). Enabled by enhanced light scattering, increased optical density of states, and structural reinforcement, the substrate demonstrates stable, high‐
Jinglai Duan, Wentao Wang, Xiu Liang, Yongliang Zhang, Jie Liu, Yu Bai, Dangyuan Lei   +6 more
wiley   +1 more source

Integrating out heavy fields in the path integral using the background-field method: general formalism [PDF]

, 2021
Stefan Dittmaier, Sebastian Schuhmacher, Maximilian Stahlhofen   +2 more
openalex   +1 more source

Path integrals and degrees of freedom in many-body systems and relativistic field theories

, 2004
The identification of physical degrees of freedom is sometimes obscured in the path integral formalism, and this makes it difficult to impose some constraints or to do some approximations.
A. Klein, F. Palumbo, F. Palumbo, H. Kleinert, J. W. Negele, L. Dolan, M. Creutz, M. Lüscher, P. Hasenfratz, S. Weinberg, V. A. Miransky   +10 more
core   +1 more source

Designing Asymmetric Memristive Behavior in Proton Mixed Conductors for Neuromorphic Applications

Advanced Functional Materials, EarlyView.
Protonic devices that couple ionic and electronic transport are demonstrated as bioinspired neuromorphic elements. The devices exhibit rubber‐like asymmetric memristive behavior with slow voltage‐driven conductance increase and rapid relaxation, enabling simplified read–write operation.
Nada H. A. Besisa, Masaki Tsuji, Yoshihiro Furue, Yifan Geng, Satya P. Pati, Satoshi Hamasuna, Takeaki Yajima   +6 more
wiley   +1 more source

Nonextensive black hole thermodynamics from generalized Euclidean path integral and Wick’s rotation

European Physical Journal C: Particles and Fields
This paper extends the Euclidean path integral formalism to account for nonextensive thermodynamics. Concretely, we introduce a generalized Wick’s rotation from real time t to imaginary time $$\tau $$ τ such that, $$t\rightarrow -i f_\alpha (\tau )$$ t →
F. Barzi, H. El Moumni, K. Masmar
doaj   +1 more source

On Bounded Strictly Positive Operators of Closed Range and Some Applications to Asymptotic Hyperstability of Dynamic Systems

Abstract and Applied Analysis, 2013
The problem discussed is the stability of two input-output feedforward and feedback relations, under an integral-type constraint defining an admissible class of feedback controllers.
M. De la Sen
doaj   +1 more source

Formally Verified Approximations of Definite Integrals [PDF]

Journal of Automated Reasoning, 2016
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Mahboubi, Assia, Melquiond, Guillaume, Sibut-Pinote, Thomas   +2 more
openaire   +5 more sources

Thermodynamics of Coupled Identical Oscillators within the Path Integral Formalism

, 1996
A generalization of symmetrized density matrices in combination with the technique of generating functions allows to calculate the partition function of identical particles in a parabolic confining well.
B. Simon, C. C. Bradlet, E. Lieb, F. Brosens, F. Brosens, F. Brosens, G. Röpstorff, G. W. Ford, J. T. Devreese, K. B. Davis, L. F. Lemmens, L. F. Lemmens, L. F. Lemmens, M. H. Anderson, M. Hammermesh, M. Takahashi, N. F. Johnson, R. Giachetti, R. P. Feynman, R. P. Feynman, R. P. Feynman, R. P. Feynman, R. W. Haase, S. Grossmann, W. Häusler   +24 more
core   +1 more source