-
Zun Wang (Southeast University)7/13/26, 3:30 PM
We derive conservative upper limits on the dark-matter–nucleon scattering cross-section for sub-GeV mass dark matter using low-energy chiral effective field theory, independent of UV details. The leading-order hadronic couplings are most severely constrained by the supernova cooling argument via processes such as nucleon bremsstrahlung and pion–DM conversion. We rule out both spin-independent...
Go to contribution page -
Diogo Capelo7/13/26, 3:45 PM
We present a comprehensive comparison of three WIMP dark matter capture rate formalisms applied to four distinct stellar environments, representative of different mass classes and evolutionary stages. For each stellar model, we compute the capture rate using a single-scatter approximation, a multi-scatter chord based method, and a new orbit-corrected variant that accounts for gravitational...
Go to contribution page -
Jorge Castelo Mourelle (Universidad Nacional Autónoma de México- Institute of Nuclear Sciences (ICN))7/13/26, 4:00 PM
We investigate a potential origin of the persistent discrepancies between white-dwarf mass estimates derived from electromagnetic techniques and those inferred from gravitational-redshift measurements, which can differ by $\sim5$–$15%$ across independent datasets. While part of this tension may arise from thermal effects, atmospheric modelling, or observational uncertainties, a subset of...
Go to contribution page -
Zakary Fuaad Buras-Stubbs7/13/26, 4:15 PM
Gravitational wave measurements of tidal deformability during binary inspiral are sensitive to a combination of the tidal Love number and compactness, leaving the radius of a compact object free to be unconstrained in the absence of electromagnetic information. This degeneracy means that a dark compact object with an appropriately tuned equation of state can mimic a neutron star across all...
Go to contribution page -
Roberto Caiozzo (SISSA)7/13/26, 4:30 PM
Recent work has highlighted the importance of a fully relativistic treatment of the dephasing of gravitational waves induced by dark-matter overdensities in extreme mass-ratio inspirals (EMRIs). We developed a fully general-relativistic formalism for the more realistic scenario in which a supermassive stellar progenitor collapses to a black hole and produces a shallower dark matter...
Go to contribution page -
Marco Bruni (University of Portsmouth)7/13/26, 4:45 PM
In the first part of this talk I will present results from numerical relativity simulations of a toy-model cosmic web of over-densities, voids and filaments with the Einstein Toolkit, evolving from standard growing-mode perturbative CDM initial conditions in the matter era, at z ~ 300. I will show how the first collapse of peaks of over-densities is very well predicted by the simple...
Go to contribution page -
Dr. ISHFAQ AHMAD RATHER (Institute for Theoretical Physics, Goethe University, 60438 Frankfurt am Main, Germany)7/15/26, 10:30 AM
We investigate the impact of a stiff dark matter equation of state (EoS) on the structure and stability of neutron stars. For dark matter, we use bosonic, self-interacting scalar fields that generate ultra-compact boson stars with compactness exceeding 1/3. Varying the dark matter particle mass and stiffness shifts stellar configurations across distinct regions of the mass–radius diagram,...
Go to contribution page -
Shafayat Shawqi (University of Alberta)7/15/26, 10:45 AM
If dark matter (DM) exists in halos around rotating neutron stars (NSs), it will be essential to understand the effects of rotation on the distribution of DM and baryonic matter (BM) in the stars to interpret observations. In this work, we construct rapidly rotating dark matter admixed neutron stars (DANS) with DM halos using the two-fluid approximation, where the BM and DM interact only...
Go to contribution page -
Claudio Cesar Lazarte Melgar (Universitat de València)7/15/26, 11:00 AM
Neutron stars offer unique natural laboratories for probing the interaction between dark matter and baryonic matter. In this talk, I will present our recent work modeling dark matter as an ultralight bosonic field that accretes onto neutron stars, forming fermion-boson stars. I will discuss our numerical relativity simulations in spherical symmetry, through which we extract and analyze the...
Go to contribution page -
Rohan Srikanth7/15/26, 11:15 AM
Binary neutron star mergers provide a laboratory for probing fundamental physics in strong-gravity regimes through gravitational-wave and electromagnetic signals. We use numerical-relativity simulations to study possible beyond-the-Standard-Model effects in these systems, focusing on a minimally coupled scalar field surrounding the binary, and lighter-than-QCD axions coupled to baryonic...
Go to contribution page -
Theo Karydas (GRAPPA, University of Amsterdam)7/15/26, 11:30 AM
Extreme mass-ratio inspirals (EMRIs) are expected to be among the most informative gravitational-wave sources for LISA, offering unprecedented access to the environments of supermassive black holes. In this talk, I will discuss how dense dark matter spikes surrounding these black holes can leave measurable imprints on EMRI signals through dynamical friction, potentially opening a new window...
Go to contribution page -
Mr Nicolas Esser7/15/26, 11:45 AM
We study binary stars moving through a uniform dark matter background and experiencing dynamical friction. The centre-of-mass motion of the pairs is taken into account. We derive formulas and timescales for the secular evolution of the orbital parameters for both wide and close binaries. We apply these results to environments typical of dark matter dominated ultra-faint dwarf galaxies and show...
Go to contribution page -
Andrew Spiers (University College Dublin)7/15/26, 3:30 PM
A key science target for the upcoming LISA mission is testing General Relativity and probing alternative theories of gravity through the observation of extreme-mass-ratio inspirals (EMRIs). Generating the requisite waveform templates for these systems using numerical relativity is computationally intractable due to the disparate length and time scales involved. Gravitational perturbation...
Go to contribution page -
Dr Andrius Tamosiunas (University of Oslo)7/15/26, 3:45 PM
In this talk, I will describe our recent work on developing a finite element method (FEM)-based code designed to solve the field equations arising in scalar–tensor theories of gravity. In particular, I will explain how our numerical code, SELCIE, can be used to simulate, design, and optimise laboratory, space, and astrophysical tests of gravity. I will present the most recent results on...
Go to contribution page -
Juan Zárate Pretel (Centro Brasileiro de Pesquisas Físicas)7/15/26, 4:00 PM
We investigate the relativistic structure of compact stars within the modified gravity framework $f(R,T,L_m)=R+\alpha T L_m$, which introduces a non-minimal coupling between matter and curvature. The modified Tolman-Oppenheimer-Volkoff equations are solved for neutron stars, quark stars and white dwarfs using realistic equations of state, considering two standard choices for the matter...
Go to contribution page -
Qi-Xin Xie (University of Nottingham)7/15/26, 4:15 PM
Boson stars are appealing black hole mimickers and dark matter candidates. They have been extensively studied in classical gravity, but their quantum properties remain comparatively unexplored. We compute the quantum scalar fields and stress tensor in boson star spacetimes within the framework of semiclassical gravity. Divergences are regularized using Pauli-Villars fields, and accurate...
Go to contribution page -
Dr Yu-Dai Tsai (Fermilab)7/15/26, 4:30 PM
Quantum consistency conditions impose powerful constraints on particle theories, but are typically treated as technical requirements in model building. Here we show that anomaly cancellation in a broad class of chiral sectors with light minicharged dark matter is exactly equivalent to the degree-3 Prouhet–Tarry–Escott problem in number theory. This correspondence yields a model-independent...
Go to contribution page -
Choose timezone
Your profile timezone: