Tootfinder

Gravitational Waves from Spectator Scalar Fields
Marcos A. G. Garcia, Sarunas Verner
https://arxiv.org/abs/2506.12126 https://arxiv.o…

Gravitational Waves from Spectator Scalar Fields
We propose a novel mechanism for gravitational wave (GW) production sourced by spectator scalar fields during inflation. These fields, while not driving cosmic expansion, generate blue-tilted isocurvature fluctuations that naturally satisfy current CMB constraints at large scales while producing enhanced power spectra at smaller scales accessible to GW detectors. The resulting GW spectrum spans an exceptionally broad frequency range from $10^{-20}$ to $1$ Hz, with amplitudes ranging from $Ω_{\…

Low-Cost Wideband Tilted Beam Antenna for Millimeter-wave Vehicle Applications
Jiawang Li
https://arxiv.org/abs/2506.08239 https://ar…

Low-Cost Wideband Tilted Beam Antenna for Millimeter-wave Vehicle Applications
To facilitate vehicle coverage for millimeter-wave applications, this communication presents a low-cost, wideband tilted-beam antenna. A novel design is proposed in which a slot antenna is both directly excited and electromagnetically coupled to a monopole array. This slot-monopole configuration is inherently robust against substrate losses, enabling low-cost fabrication while maintaining high realized gain and compact size. Furthermore, the slot-fed structure effectively excites multiple reson…

First images of the Sun's south pole!
Solar Orbiter is the first space probe to look at the Sun's poles – and finds the magnetic field there in a state of turmoil. The Sun's magnetic field is currently undergoing a flip. During its latest flyby of the Sun at the end of March this year, the Solar Orbiter space probe had its first clear view of our star's poles. First images:

Calvary (Crucified Christ, the Virgin and Saint John the Evangelist)
Castile-Leon (?), last quarter of the 13th c.-early 14th c.
Polychrome oak wood
Portugal's National Museum of Ancient Art, Lisbon

Propylenidene: A New Carbon Two-dimensional Material Featuring Tilted Dirac Cones
Jose A. S. Laranjeira, K. A. L. Lima, Nicolas F. Martins, Luis A. Cabral, L. A. Ribeiro Junior, Julio R. Sambrano
https://arxiv.org/abs/2506.03494

Propylenidene: A New Carbon Two-dimensional Material Featuring Tilted Dirac Cones
Two-dimensional (2D) carbon allotropes have drawn significant interest owing to their impressive physical and chemical characteristics. Following graphene's isolation, a wide range of 2D carbon materials has been suggested, each with distinct electronic, mechanical, and optical traits. Rational design and synthesis of new 2D carbon structures hinge on experimentally reported precursors. Here, we present a 2D carbon allotrope, propylenidene (PPD), originating from the highly strained bicycloprop…

Primordial Black Holes Save $R^2$ Inflation
Kazunori Kohri, Xinpeng Wang
https://arxiv.org/abs/2506.06797 https://arxiv.org/pdf/2506.…

Primordial Black Holes Save $R^2$ Inflation
In light of the latest Planck-Atacama Cosmology Telescope (P-ACT) joint results on the primordial scalar power spectrum, we show that the $R^2$ inflation model extended with a non-minimally coupled scalar field $χ$--namely the $R^2$-Higgs model--can yield a larger spectral index $n_s$ and a small positive running $α_s$ at cosmic microwave background (CMB) scales, which are consistent with the data. This is because the $χ$ field contributes a blue-tilted component to the primordial power spec…

Turbulent separation control with a tilted wavy wall: a promising approach for energy savings in aerodynamic systems
Piotr Kami\'nski, Artur Tyliszczak, Witold Elsner, Pawe{\l} Niegodajew
https://arxiv.org/abs/2505.22611

Turbulent separation control with a tilted wavy wall: a promising approach for energy savings in aerodynamic systems
Recently, Kamiński et al. [1] demonstrated that a two-dimensional streamwise waviness with carefully selected amplitude and period can be effectively used in postponement of a flow separation at high Reynolds number which is out of reach for other commonly known passive flow control strategies. This paper demonstrates that this approach can be substantially improved by introducing a novel type of surface waviness characterized by tilting the subsequent waves. The research is performed by apply…

Tilt-Induced Localization in Interacting Bose-Einstein Condensates for Quantum Sensing
Argha Debnath, Mariusz Gajda, Debraj Rakshit
https://arxiv.org/abs/2506.06173

Tilt-Induced Localization in Interacting Bose-Einstein Condensates for Quantum Sensing
We investigate localization transitions in interacting Bose-Einstein condensates (BECs) confined in tilted optical lattices, focusing on both the continuum limit accessed via shallow lattice depths and the tight-binding limit realized in the deep lattice regime. Utilizing the Gross-Pitaevskii equation (GPE) and the many-body Bose-Hubbard model, we analyze the scaling behavior of localization indicators, such as the root mean square width and fidelity susceptibility, as a function of the applied…

This https://arxiv.org/abs/2411.06332 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_qu…

Quantum feedback induced entanglement relaxation and dynamical phase transition in monitored free fermion chains with Wannier-Stark ladder
In recent years, measurement induced entanglement transitions (MIETs) have attracted significant attention. However, the dynamical transition associated with the feedback induced skin effect, which exhibits a wealth of intriguing phenomena, has not been fully understood. In this work, we investigate a dynamical phase transition in a tilted free-fermion chain under measurement-feedback protocols, emphasizing the particle density and entanglement entropy dynamics. We reveal a feedback induced ski…

This https://arxiv.org/abs/2506.03460 has been replaced.
initial toot: https://mastoxiv.page/@ar…

Three-dimensional reconstruction of THz near-fields from a LiNbO3 optical rectification source
Terahertz (THz) generation by optical rectification in LiNbO3 (LN) is a widely used technique for generating intense THz radiation. The spatiotemporal characterization of THz pulses from these sources is currently limited to far-field methods. While simulations of tilted pulse front THz generation have been published, little work has been done to measure the near-field properties of the THz source. A better understanding of the THz near-field properties will improve optimization of THz generati…