Article
Astronomy & Astrophysics
Logan Morrison, Stefano Profumo, Dean J. Robinson
Summary: The study discusses a dark QCD sector as a minimal extension of the Standard Model, which includes Dark Matter candidates without the need for additional interactions with the visible sector. Under specific conditions, this dark sector can generate Dark Matter candidates.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Yann Mambrini, Keith A. Olive, Jiaming Zheng
Summary: Dark matter may only interact with the visible sector at high energy scales. During the period of reheating, the dominant process of dark matter production is through the decay products of the inflaton. This process dominates for low reheating temperatures and can produce the required density of dark matter.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Wasif Husain, Anthony W. Thomas
Summary: This study examines neutron star models with dark matter in the core, investigating properties of different types of dark matter particles and their interactions. Constraints on mass, radius, and tidal deformability are considered, along with the distribution of energy density inside the stars. The presence and behavior of fermionic dark matter throughout the star is particularly noted.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Seyong Kim, M. Laine
Summary: Recently, there have been questions regarding how kinetic equilibrium is maintained when freeze-out dynamics is pushed to low temperatures in the context of the scalar singlet dark matter model with a mass of 60 GeV. Langevin simulations are used to address the non-equilibrium momentum distribution of non-relativistic particles in a cosmological background. These simulations suggest that kinetic equilibrium is a good approximation down to temperatures around 1 GeV for scalar singlet masses below 60 GeV, with deviations appearing as a red-tilted spectrum. This confirms that a slightly larger coupling than in equilibrium is needed to obtain the correct abundance, reducing the annihilation cross section.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Takanori Sato, Fuminobu Takahashi, Masaki Yamada
Summary: This paper investigates the gravitational production of dark photon dark matter during inflation when dark photons acquire mass through the Higgs mechanism. The research reveals that the energy density spectrum of dark photons can have two peaks at intermediate and small scales. Dark photons can explain dark matter, but their current mass needs to fall within a specific range.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Luca Di Luzio, Belen Gavela, Pablo Quilez, Andreas Ringwald
Summary: This study suggests that dark matter can be explained by an axion that solves the strong CP problem, with a wide range of mass values. A novel misalignment mechanism known as trapped misalignment occurs, due to the unique temperature dependence of the Z(N) axion potential. Trapped misalignment is more general and may dynamically source the recently proposed kinetic misalignment mechanism.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Mansi Dhuria, Viraj Karambelkar, Vikram Rentala, Priyanka Sarmah
Summary: This work explores a novel mechanism for inducing a 21 cm absorption signal in the global cosmological signal, different from standard cosmology and excess gas cooling models. The model predicts a strong, broadband absorption signal extending from early cosmic dark ages to higher frequencies where star formation effects are expected. The absorption signal may measure only the spin temperature evolution in certain regions of parameter space, which could provide insights into the nature of dark matter interactions.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Prolay Chanda, James Unwin
Summary: In this paper, the scenario in which Asymmetric Dark Matter (ADM) decouples from the Standard Model thermal bath during an early period of matter domination is explored. Model independent analysis and a specific example in the context of an elegant SO(10) implementation are presented and contrasted with conventional ADM models. The prospects for superheavy ADM in this setting are discussed in the concluding remarks.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Simone Biondini, Jacopo Ghiglieri
Summary: In this study, the impact of the high-temperature regime on dark matter production rate is investigated. It is found that in such conditions, multiple soft scatterings and 2 -> 2 processes contribute significantly to the production rate.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Alberto Salvio
Summary: The article investigates the general effective field theory describing the interactions of a massless dark photon with all Standard Model particles. The thermal production rate, cosmological yield, and contribution to the effective number of neutrinos of the dark photon are calculated. These predictions meet current observational bounds and will be tested in future measurements.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Aleksandr Chatrchyan, Geraldine Servant
Summary: The relaxion mechanism, which involves the interplay between the Higgs and axion, provides a dynamic solution to the Higgs mass hierarchy problem. Although the relaxion abundance today is too small to explain dark matter due to the suppression of the misalignment angle after inflation, it has been found that reheating effects can displace the relaxion and enable it to account for dark matter abundance via the misalignment mechanism. The stochastic misalignment of the field due to fluctuations can be significant in the regime where inflationary fluctuations dominate. The evolution of the relaxion after inflation, including the effects of high temperature, is studied, and new regions of parameter space are identified where the relaxion can naturally explain the observed dark matter density in the universe.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Mar Bastero-Gil, Jose Santiago, Roberto Vega-Morales, Lorenzo Ubaldi
Summary: We study a mechanism for producing dark photon dark matter at the end of inflation. The rolling inflaton induces a tachyonic instability, leading to the coherent production of dark gauge bosons. We examine the case where the dark photons are relativistic when their mass is generated and calculate the relic abundance today. Furthermore, we analyze the late time power spectrum and find that it preserves the peak generated at the end of inflation.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Marco Gorghetto, Edward Hardy, John March-Russell, Ningqiang Song, Stephen M. West
Summary: This study shows that vector bosons with mass produced during inflation may contribute to the observed dark matter density. The dark matter in this scenario has rich substructure, with quantum coherent solitons and fuzzy dark matter halos. These solitons have higher densities than the background dark matter and may survive until the present day. The presence of this substructure opens up new possibilities for the direct and indirect detection of dark matter.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Sougata Ganguly, Sourov Roy, Ananya Tapadar
Summary: The lack of information before BBN allows for the presence of a new species 0 with a specific energy density redshift. This non-standard cosmological setup enables a larger coupling between the dark and visible sectors, even without thermal equilibrium. By considering the U(1)Lmu-LT 0 U(1)X gauge extension of the SM, different cosmological phases of the thermally decoupled dark sector are studied. It is shown that the dark matter relic density and muon (g - 2) anomaly can be reconciled within this scenario, satisfying various constraints.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Mar Bastero-Gil, Antonio Torres Manso
Summary: We present a supersymmetric extension of a unified model for inflation and Dark Matter, which is based on the incomplete decay of the inflaton field into right-handed neutrino pairs. By imposing a discrete interchange symmetry on the inflaton and right-handed neutrinos, stability of the inflaton field at the global minimum is ensured, while still allowing partial decay and reheating of the Universe. Compatibility with inflationary predictions, BBN bounds, and obtaining the right DM abundance typically requires large couplings to the neutrino sector.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Patrick Stoecker, Michael Kraemer, Julien Lesgourgues, Vivian Poulin
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2018)
Article
Astronomy & Astrophysics
Janina J. Renk, Patrick Stocker, Sanjay Bloor, Selim Hotinli, Csaba Balazs, Torsten Bringmann, Tomas E. Gonzalo, Will Handley, Sebastian Hoof, Cullan Howlett, Felix Kahlhoefer, Pat Scott, Aaron C. Vincent, Martin White
Summary: CosmoBit, a module within the open-source GAMBIT software framework, provides a flexible framework for studying various scenarios beyond ACDM, with the ability to compute many observables and likelihoods via interfaces to various codes. It allows for a wide range of constraints from different cosmological observations, and parameter scans can be performed using statistical sampling algorithms within the GAMBIT framework.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Physics, Particles & Fields
Torsten Bringmann, Saniya Heeba, Felix Kahlhoefer, Kristian Vangsnes
Summary: Calculating the relic density of dark matter freezing out from the primordial plasma has become sophisticated, while calculating dark matter production via the freeze-in mechanism is more challenging due to higher temperatures and additional complications. This article revisits the formulation of freeze-in production and provides the most accurate calculation of the freeze-in abundance for Scalar Singlet dark matter. The accompanying update of DarkSUSY allows for general freeze-in calculations, including various complexities.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Timon Emken, Jonas Frerick, Saniya Heeba, Felix Kahlhoefer
Summary: The observation of excess electron recoil events in the XENON1T experiment has sparked increased interest in the interactions between dark matter particles and electrons. This study investigates the possibility of terrestrial upscattering, specifically the inelastic scattering of dark matter particles on nuclei in the Earth, as a potential source of excited states that can explain the observed excess. Analytical and Monte Carlo methods are used to predict the density and velocity distribution of these excited states. The results show a daily modulation of the electron recoil signal at the level of 10% in the XENON1T experiment, with a strong dependence on the dark matter mass.
Article
Astronomy & Astrophysics
Patrick Stoecker, Csaba Balazs, Sanjay Bloor, Torsten Bringmann, Tomas E. Gonzalo, Will Handley, Selim Hotinli, Cullan Howlett, Felix Kahlhoefer, Janina J. Renk, Pat Scott, Aaron C. Vincent, Martin White
Summary: The upper limit on the mass of the lightest neutrino has been determined using recent cosmological and terrestrial data. These results are more robust than previous limits and constrain the mass of the lightest neutrino to be barely larger than the largest mass splitting. Impacts of realistic mass models and different sources of N-eff have been shown.
Article
Astronomy & Astrophysics
Brian Colquhoun, Saniya Heeba, Felix Kahlhoefer, Laura Sagunski, Sean Tulin
Summary: This work presents quantum-mechanical derivation and new analytic formulas for semiclassical momentum transfer and viscosity cross sections for self-interactions mediated by a Yukawa potential. The results go beyond the classical limit, allowing for both distinguishable and identical dark matter particles, and provide nearly complete analytic coverage of the parameter space for self-interactions with a Yukawa potential. The implications of the results are discussed and a new velocity-averaging procedure is provided for constraining velocity-dependent self-interactions.
Article
Astronomy & Astrophysics
Saniya Heeba, Felix Kahlhoefer