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๐Ÿ” omar ramirez ๐Ÿ“‚ Physics
Showing 302 results for "omar ramirez" in Physics
Physics Preprint PDF DOI

Benchmarking Universal Machine-Learned Interatomic Potentials for High-Temperature Metal-Organic Framework Chemistry

Connor W. Edwards, Jack D. Evans ยท 2026

Universal machine-learned interatomic potentials (uMLIPs) offer a promising approach to performing atomistic simulations at near-DFT accuracy with greatly reduced computational cost. Here, we present โ€ฆ

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A Covariant Phase Space Approach to Einstein-AEther Gravity

Walter Arata, Stefano Liberati, Giulio Neri ยท 2026

Black hole thermodynamics in Lorentz-violating gravity is subtle because different excitations propagate at different speeds and hence identify different causal horizons. We revisit Einstein--AEther gโ€ฆ

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Mercury Craters Named after Tajik-Persian Poets: Planetary Nomenclature as a Form of Preserving Cultural Heritage

Rizoi Bakhromzod ยท 2026

Nine impact craters on Mercury bear the names of Persian-Tajik poets: Rudaki, Saadi, Nizami, Rumi, Navoi, Firdousi, Hafiz, Sanai, and Mahsati. We compile IAU-approved coordinates, diameters, quadrant โ€ฆ

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Physics Preprint PDF DOI

Local kinetic sensors for adaptive mesh and algorithm refinement

R. M. Strassle, S. A. Hosseini, I. V. Karlin ยท 2026

This paper presents novel refinement sensors for the application to adaptive mesh and algorithm refinement (AMAR) with kinetic models, such as discrete velocity and lattice Boltzmann methods. While reโ€ฆ

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Physics Preprint PDF DOI

Axially symmetric wormholes

I. A. Sarmiento-Alvarado, Leonel Bixano, Tonatiuh Matos ยท 2026

In this work, we derive an exact vacuum solution to the Einstein field equations that depends on three constant parameters: the throat radius $r_0$, a parameter $q$, which is closely associated with tโ€ฆ

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A fresh look at boundary terms in Einstein-Hilbert gravity via an initial value variational principle

Songmin Ha, Alexander Rothkopf ยท 2026

A key tenet of general relativity is the dynamical nature of space-time, ideally represented as an initial value problem. Here we explore the variational formulation of classical Einstein-Hilbert gravโ€ฆ

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DFT and MLIP study of solute segregation to coherent and semi-coherent {\alpha}-Fe/Fe$_3$C interfaces

Amin Reiners-Sakic, Ronald Schnitzer, David Holec ยท 2026

Solute segregation to interfaces significantly impacts material behavior. A large majority of theoretical works focus on grain boundaries and coherent interfaces. Studies on semi-coherent interfaces aโ€ฆ

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Physics Preprint PDF DOI

Higher-form symmetries in supergravity, scalar charges and black-hole thermodynamics

Gabriele Barbagallo, Jose Luis V. Cerdeira, Carmen Gomez-Fayren, Patrick Meessen, Tomas Ortin ยท 2025

Minimal 5-dimensional supergravity compactified on a circle gives the T$^{3}$ model of $\mathcal{N}=2,d=4$ supergravity, whose duality group is SL$(2,\mathbb{R})$. We study exhaustively the relations โ€ฆ

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Benchmarking Universal Machine Learning Interatomic Potentials for Supported Nanoparticles: Decoupling Energy Accuracy from Structural Exploration

Jiayan Xu, Abhirup Patra, Amar Deep Pathak, Sharan Shetty, Detlef Hohl, Roberto Car ยท 2025

Supported nanoparticle catalysts are widely used in the chemical industry. Computational modeling of supported nanoparticles based on density functional theory (DFT) often involves structural searchesโ€ฆ

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Fant\^omas: An analysis of parton distributions in a pion with B\'ezier parametrizations

Lucas Kotz, Aurore Courtoy, Pavel Nadolsky, Fredrick Olness, Maximiliano Ponce-Chavez ยท 2025

We systematically explore the parametrization dependence of the Parton Distribution Functions (PDFs) to better quantify the true uncertainty from global QCD analyses. To achieve this, we employ a noveโ€ฆ

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Conundrum of regular black holes with nonlinear electromagnetic fields

Ana Bokulic, Tajron Juric, Ivica Smolic ยท 2025

The search for regular black holes with nonlinear electromagnetic fields has sprouted numerous candidates, each exhibiting certain virtues but often accompanied by significant drawbacks. We demonstratโ€ฆ

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A Quasigroup Approach for Conservation Laws in Asymptotically Flat Spacetimes

Alfonso Zack Robles, Alexander I. Nesterov, Claudia Moreno ยท 2025

In the framework of the quasigroup approach to conservation laws in general relativity, we show how the infinite-parametric Newman-Unti group of asymptotic symmetries can be reduced to the Poincare quโ€ฆ

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Negative mass singularities mimicking dark energy

Bob Holdom ยท 2025

One or two negative mass singularities are found to occur in static inhomogeneous spatially closed solutions to the Einstein equations. The singularities produce a positive Komar mass, and this decreaโ€ฆ

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Thermal Conductivity Limits of MoS$_2$ and MoSe$_2$: Revisiting High-Order Anharmonic Lattice Dynamics with Machine Learning Potentials

Tugbey Kocabas, Murat Keceli, Tanju Gurel, Milorad Milosevic, Cem Sevik ยท 2025

Group-VI transition metal dichalcogenides (TMDs), MoS$_2$ and MoSe$_2$, have emerged as prototypical low-dimensional systems with distinctive phononic and electronic properties, making them attractiveโ€ฆ

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Rotating Extremal Black Holes in Einstein-Born-Infeld Theory

Tomas Hale, Robie A. Hennigar, David Kubiznak ยท 2025

We construct exact solutions that describe the near horizon region of extremal rotating black holes in Einstein-Born-Infeld theory. Using generalized Komar integrals, we extract the electric charge anโ€ฆ

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Equality of ADM mass and generalized Komar energy in asymptotically-flat dynamical spacetimes

Zhi-Wei Wang, Samuel L. Braunstein ยท 2025

We find a relation between the ADM mass and a generalized Komar energy in asymptotically-flat spacetime. We do not need to assume the existence of either a Killing or even asymptotically-Killing vectoโ€ฆ

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Gravitational currents and charges from conformal Killing-Yano tensors

Chris Hull, Ulf Lindstrom, Maxwell L. Velasquez Cotini Hutt ยท 2025

We construct a set of higher-form conserved currents on spacetimes admitting conformal Killing-Yano tensors. We find relations between these currents that allow the charge given by integrating one of โ€ฆ

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Fant\^omas Unconfined: global QCD fits with B\'ezier parameterizations

Lucas Kotz, Aurore Courtoy, T. J. Hobbs, Pavel Nadolsky, Fredrick Olness, Maximiliano Ponce-Chavez, Varada Purohit ยท 2025

Fant\^omas is a C++ toolkit for exploring the parametrization dependence of parton distribution functions (PDFs) and other correlator functions in quantum chromodynamics (QCD). Fant\^omas facilitates โ€ฆ

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The Komar charge in presence of the Holst term and the gravitational Witten effect

Jose Luis V. Cerdeira, Tomas Ortin ยท 2025

In the first-order formalism, the Einstein--Hilbert action can be modified by the addition of a Holst term multiplied by the Barbero parameter $\alpha$. This modification breaks parity although it doeโ€ฆ

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On the generalized Komar charge of Kaluza-Klein theories and higher-form symmetries

G. Barbagallo, J.L.V. Cerdeira, C. Gomez-Fayren, P. Meessen, T. Ortin ยท 2025

The generalized Komar $(d-2)$-form charge can be modified by the addition of any other on-shell closed (conserved) $(d-2)$-form charge. We show that, with Kaluza--Klein boundary conditions, one has toโ€ฆ

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