Outputs (42)

Detecting dark matter oscillations with gravitational waveforms (2024)
Journal Article
Brax, P., Valageas, P., Burrage, C., & Cembranos, J. A. (in press). Detecting dark matter oscillations with gravitational waveforms. Physical Review D, 110(8), Article 083515. https://doi.org/10.1103/physrevd.110.083515

We consider the phase shift in the gravitational wave signal induced by fast oscillations of scalar dark matter surrounding binary systems, which could be probed by the future experiments LISA and DECIGO. This effect depends on the local matter densi... Read More about Detecting dark matter oscillations with gravitational waveforms.

Shadows and properties of spin-induced scalarized black holes with and without a Ricci coupling (2024)
Journal Article
Fernandes, P. G., Burrage, C., Eichhorn, A., & Sotiriou, T. P. (2024). Shadows and properties of spin-induced scalarized black holes with and without a Ricci coupling. Physical Review D, 109(10), Article 104033. https://doi.org/10.1103/physrevd.109.104033

In this work, we explore the properties and shadows of spin-induced scalarized black holes, as well as investigate how a Ricci coupling influences them. Our findings reveal significant deviations from the Kerr metric in terms of the location and geod... Read More about Shadows and properties of spin-induced scalarized black holes with and without a Ricci coupling.

Using machine learning to optimise chameleon fifth force experiments (2024)
Journal Article
Briddon, C., Burrage, C., Moss, A., & Tamosiunas, A. (2024). Using machine learning to optimise chameleon fifth force experiments. Journal of Cosmology and Astroparticle Physics, 2024(2), Article 11. https://doi.org/10.1088/1475-7516/2024/02/011

The chameleon is a theorised scalar field that couples to matter and possess a screening mechanism, which weakens observational constraints from experiments performed in regions of higher matter density. One consequence of this screening mechanism is... Read More about Using machine learning to optimise chameleon fifth force experiments.

Higgs-induced screening mechanisms in scalar-tensor theories (2023)
Journal Article
Burrage, C., & Millington, P. (2024). Higgs-induced screening mechanisms in scalar-tensor theories. Annals of the New York Academy of Sciences, 1531(1), 95-103. https://doi.org/10.1111/nyas.15092

We consider the theory of a light conformally coupled scalar field, that is, one that is coupled directly to the Ricci scalar of the gravitational sector. This theory can be written equivalently as one of a light scalar that is coupled to the Standar... Read More about Higgs-induced screening mechanisms in scalar-tensor theories.

Spinning black holes with axion hair (2023)
Journal Article
Burrage, C., Fernandes, P. G. S., Brito, R., & Cardoso, V. (2023). Spinning black holes with axion hair. Classical and Quantum Gravity, 40(20), Article 205021. https://doi.org/10.1088/1361-6382/acf9d6

In this work we construct and analyze non-perturbative stationary and axially-symmetric black hole solutions in general relativity coupled to an electromagnetic and an axion field. The axion field is coupled to the electromagnetic field, which leads... Read More about Spinning black holes with axion hair.

Invisible dilaton (2023)
Journal Article
Brax, P., Burrage, C., Cembranos, J. A., Valageas, P., & Cembranos, J. A. (2023). Invisible dilaton. Physical Review D, 107(9), Article 095015. https://doi.org/10.1103/PhysRevD.107.095015

We analyze the dynamics of a light scalar field responsible for the μ term of the Higgs potential and coupled to matter via the Higgs-portal mechanism. We find that this dilaton model is stable under radiative corrections induced by the standard mode... Read More about Invisible dilaton.

Chameleon screening in cosmic voids (2022)
Journal Article
Tamosiunas, A., Briddon, C., Burrage, C., Cutforth, A., Moss, A., & Vincent, T. (2022). Chameleon screening in cosmic voids. Journal of Cosmology and Astroparticle Physics, 2022(11), Article 056. https://doi.org/10.1088/1475-7516/2022/11/056

A key goal in cosmology in the upcoming decade will be to form a better understanding of the accelerated expansion of the Universe. Upcoming surveys, such as the Vera C. Rubin Observatory's 10-year Legacy Survey of Space and Time (LSST), Euclid and t... Read More about Chameleon screening in cosmic voids.

Dark sector domain walls could explain the observed planes of satellites (2022)
Journal Article
Naik, A. P., & Burrage, C. (2022). Dark sector domain walls could explain the observed planes of satellites. Journal of Cosmology and Astroparticle Physics, 2022(08), Article 020. https://doi.org/10.1088/1475-7516/2022/08/020

The observed 'planes of satellites' around the Milky Way and other nearby galaxies are notoriously difficult to explain under the ΛCDM paradigm. Here, we propose an alternative solution: domain walls arising in theories with symmetry-breaking scalar... Read More about Dark sector domain walls could explain the observed planes of satellites.

Chameleon screening depends on the shape and structure of NFW halos (2022)
Journal Article
Tamosiunas, A., Briddon, C., Burrage, C., Cui, W., & Moss, A. (2022). Chameleon screening depends on the shape and structure of NFW halos. Journal of Cosmology and Astroparticle Physics, 2022(4), Article 047. https://doi.org/10.1088/1475-7516/2022/04/047

Chameleon gravity is an example of a model that gives rise to interesting phenomenology on cosmological scales while simultaneously possessing a screening mechanism, allowing it to avoid solar system constraints. Such models result in non-linear fiel... Read More about Chameleon screening depends on the shape and structure of NFW halos.

Charting galactic accelerations - II: How to ‘learn’ accelerations in the solar neighbourhood (2022)
Journal Article
Naik, A. P., An, J., Burrage, C., & Evans, N. W. (2022). Charting galactic accelerations - II: How to ‘learn’ accelerations in the solar neighbourhood. Monthly Notices of the Royal Astronomical Society, 511(2), 1609-1621. https://doi.org/10.1093/mnras/stac153

Gravitational acceleration fields can be deduced from the collisionless Boltzmann equation, once the distribution function is known. This can be constructed via the method of normalizing flows from data sets of the positions and velocities of stars.... Read More about Charting galactic accelerations - II: How to ‘learn’ accelerations in the solar neighbourhood.