A study explores the possibility that dark photons could be a source of heat for intergalactic gas

Un estudio explora la posibilidad de que los fotones oscuros puedan ser una fuente de calor para el fuel intergal谩ctico

(Higher panel) Match to the distribution of Doppler parameters and the Lyman-alpha forest column density distribution operate at z = 0.1 assuming a most heating contribution of darkish photons to the road widths. The contours present the projection of the 68% and 95% intervals for the mass and mixing parameter of the darkish photon. Colours correspond to completely different assumptions in regards to the uncertainty of the intergalactic imply temperature at z = 2. (Decrease panel) Corresponding best-fit fashions in comparison with COS observational information. The stable grey curve reveals a end result with out darkish photon heating. Credit score: Bodily Overview Letters (2022). DOI: 10.1103/PhysRevLett.129.211102

Fuel clouds all through the universe are recognized to soak up gentle produced by distant large celestial objects, referred to as quasars. This gentle manifests because the so-called Lyman alpha forest, a dense construction made up of absorption traces that may be noticed utilizing spectroscopy instruments.

In latest many years, astrophysicists have been evaluating the worth of those absorption traces as a software to higher perceive the universe and the relationships between cosmological objects. Lyman’s alpha forest might additionally doubtlessly help the continued seek for darkish matter, providing an extra software for testing fashions and theoretical predictions.

Researchers from the College of Nottingham, Tel-Aviv College, New York College, and the Institute for Elementary Physics of the Universe in Trieste just lately in contrast observations of the low redshift alpha Lyman forest with hydrodynamic simulations of the intergalactic medium and the darkish matter composed of darkish photons, a famend darkish matter candidate.

His work, revealed in Bodily Overview Letters (prl), it is based mostly on a earlier job by some members of his staff, who in contrast simulations of the intergalactic medium (IGM) with measurements of the Lyman-alpha forest collected by the Cosmic Origins Spectrograph (COS) aboard the Hubble House Telescope.

“In our analyses, we discovered that the simulation predicted linewidths that have been too slim in comparison with the COS outcomes, suggesting that there is likely to be extra non-canonical sources of heating that happen at low redshifts,” Hongwan Liu, Matteo Viel, Andrea Caputo and James Bolton, the researchers who carried out the examine, advised Phys.org by way of electronic mail.

“We explored a number of fashions of darkish matter that would act as this warmth supply. Based mostly on the expertise of two of the authors with darkish photons in a earlier article revealed in prlwe ultimately realized that heating from darkish photon darkish matter might work.”

Based mostly on their earlier observations, Liu, Viel, Caputo, and Bolton determined to change a hydrodynamic simulation of the IGM (ie, a scattered cloud of hydrogen that exists within the areas between galaxies). Of their new simulation, they included the consequences of warmth that fashions predict darkish matter from darkish photons would produce.

“In areas of house the place the mass of the darkish photon matches the efficient plasma photon mass, conversions from darkish photons to photons can happen,” Liu, Viel, Caputo, and Bolton defined. “The transformed photons are then quickly absorbed by the IGM in these areas, heating the fuel. The quantity of power transferred from darkish matter to the fuel could be calculated theoretically.”

The researchers added this estimated power switch between darkish photons and intergalactic clouds to their simulations. In the end, this allowed them to realize a sequence of simulated absorption line widths, which they might examine with the precise Lyman-alpha forest observations collected by the COS.

“Broadly talking, we’ve got proven that the Lyman-alpha forest is extraordinarily helpful for understanding darkish matter fashions the place power could be transformed from darkish matter to warmth,” mentioned Liu, Viel, Caputo and Bolton. “I believe our examine will encourage physicists serious about darkish matter to pay extra consideration to the Lyman-alpha forest.”

Normally, the comparability between the COS measurements and the hydrodynamic simulations carried out by this staff of researchers means that darkish photons might be a supply of warmth in intergalactic fuel clouds. Their findings might due to this fact be the primary indication of the existence of darkish matter that’s not noticed by means of its gravitational results.

Whereas it is a fascinating chance, Liu, Viel, Caputo, and Bolton haven’t but dominated out different attainable theoretical explanations. Due to this fact, they hope that their examine will encourage different groups to equally check the properties of the IGM within the primitive universe.

“A very attention-grabbing consequence of darkish photon heating is that underdense areas within the IGM warmth up sooner than overdense areas,” Liu, Viel, Caputo and Bolton mentioned. “This will result in underdense areas being hotter than overdense areas, which is opposite to plain expectations. There’s some indication that the IGM reveals this conduct at excessive redshifts. If that’s the case, this might be additional proof. necessary in favor of darkness”. photon darkish matter heating.”

Extra info:
James S. Bolton et al, Comparability of Low Redshift Lyman-伪 Forest Observations with Darkish-Photon Darkish Matter Hydrodynamic Simulations, Bodily Overview Letters (2022). DOI: 10.1103/PhysRevLett.129.211102

James S Bolton et al, Boundaries of non-canonical heating and turbulence within the intergalactic medium of the low redshift Lyman 伪 forest, Month-to-month Notices of the Royal Astronomical Society (2022). DOI: 10.1093/mnras/stac862

Andrea Caputo et al, Oscillations of darkish photons in our inhomogeneous universe, Bodily Overview Letters (2020). DOI: 10.1103/PhysRevLett.125.221303

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Quotation: Examine explores the likelihood that darkish photons could also be a warmth supply for intergalactic fuel (Dec 7, 2022) Retrieved on Dec 7, 2022 from https://phys.org/information/2022-12- explores-possibility-dark-photons-source .html

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