Article
Astronomy & Astrophysics
J. A. Aguilar-Saavedra, D. E. Lopez-Fogliani, C. Munoz, M. Pierre
Summary: The study introduces the U mu nu SSM model as an extension of the mu nu SSM supersymmetric model, where violating baryon-number operators and explicit mass terms are prohibited. The research also analyzes the relic density of the dark matter candidate by calculating through Z', Higgs-right sneutrino, and dark matter mediated annihilations, as well as assessing potential signals in dark matter direct detection experiments.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Wei Cheng, Xuewen Liu, Ruiyu Zhou
Summary: This paper studies the cosmological inflation and dark matter within a Z3 complex scalar model and finds that the mixing angle, DM mass, and Higgs-like scalar mass are constrained in the low-energy scale. It also suggests that measuring the tensor-to-scalar ratio with higher precision can distinguish between the two forms of inflation in the high-energy scale.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Physics, Multidisciplinary
Mikhail Shaposhnikov, Andrey Shkerin, Inar Timiryasov, Sebastian Zell
Summary: This passage discusses a novel mechanism for producing singlet fermions in the early Universe through gravity-induced interactions. These fermions can act as dark matter particles and are applicable to a wide range of dark matter particle masses. The potential observational consequences of producing keV-scale dark matter in this way, particularly for right-handed neutrinos, are also explored. The authors suggest that determining the momentum distribution of primordial dark matter may shed light on gravity-induced fermionic interactions.
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
Oleg Lebedev
Summary: Stable scalars can be abundantly produced in the Early Universe even without coupling to other fields. The production and mass scale of these scalars during and after (high scale) inflation are studied, leading to strong constraints. Quantum gravity-induced Planck-suppressed operators significantly affect the abundance of dark matter relics, often resulting in overproduction unless the corresponding Wilson coefficients are very small. The uncontrollable nature of these effects without a quantum gravity theory questions the predictability of many non-thermal dark matter models and has potential implications for string theory constructions with abundant scalar fields.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Mayumi Aoki, Jisuke Kubo, Jinbo Yang
Summary: Utilizing dynamical chiral symmetry breaking in a QCD-like hidden sector to generate the Planck mass and the electroweak scale, the study proposes hidden pions as dark matter candidates. However, due to their super heavy mass (10^9 to 10^12 GeV) and extremely suppressed interaction with the visible sector, direct detection of these hidden pions is not feasible.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Alexandros Karam, Martti Raidal, Eemeli Tomberg
Summary: The study focuses on preheating in plateau inflation in a scenario similar to Higgs inflation, revealing that the oscillating inflaton field repeatedly returns to the plateau, leading to tachyonic production of inflaton particles. Moreover, it is demonstrated that a minimally coupled spectator scalar field can be more efficiently produced through a similar mechanism. The mechanism is solely gravitational and the scalar field mass can be as high as 10^13 GeV, making it a candidate for superheavy dark matter.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
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
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
Federico Compagnin, Stefano Profumo, Nicolao Fornengo
Summary: This article investigates the cosmology and phenomenology of a dark photon portal with a simple dark sector composed of a single, light, fermionic dark matter particle species with mass in the MeV range. Three possible kinetic mixing structures between a new Abelian gauge group U(1)dark and the visible sector are considered: U(1)e.m., U(1)Y, and T[SU(2)L]. The author assumes the dark photon to have a massive and MeV-scale mass, close to the mass scale of the dark matter candidate. The article calculates the dark matter relic density through freeze-out and freeze-in, taking into account the possibility of a late inflationary period that could dilute the dark matter yield of heavy candidates and additional production modes for models with under-abundant thermal production. The parameter space compatible with various experimental and astrophysical constraints is explored, and prospects for discovery using new CMB probes and MeV gamma-ray telescopes are discussed.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Lei Zu, R. Foot, Yi-Zhong Fan, Lei Feng
Summary: The study investigates the possibility of dark matter in the form of a dark plasma in the Milky Way halo, interacting with ordinary matter and producing signals in dark matter direct detection experiments. The observed excess in the XENON1T experiment can be explained with kinetic mixing in a specific range, consistent with astrophysical and cosmological constraints and other direct detection experiments.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Talal Ahmed Chowdhury, Shaikh Saad
Summary: Expanding the Standard Model with a non-Abelian gauge symmetry can explain the muon anomalous magnetic moment and reproduce the correct relic abundance, but concurrently describing the electron anomalous magnetic moment in this setup is challenging.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Lam Hui, Austin Joyce, Michael J. Landry, Xinyu Li
Summary: The interference of waves in galactic halos inevitably leads to the formation of vortices, which exhibit universal features such as taking the form of vortex rings in three spatial dimensions and typically containing only single winding vortices in realistic scenarios. The density near a vortex scales as r(2) while the velocity goes as 1/r, and smaller vortex rings move faster due to their curvature scale. Observational and experimental signatures from these vortices and wave interference include gravitational lensing leading to flux anomalies in strongly lensed systems, as well as potential signal diminishment in detection experiments for QCD axions. We also propose the measurement of correlation functions by axion detection experiments to probe and utilize the expected interference substructures.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Sven Baumholzer, Vedran Brdar, Enrico Morgante
Summary: In this study, structure formation limits on dark matter composed of keV-scale axion-like particles are derived, with a focus on freeze-in production through interactions with photons and SM fermions. The results show that for the photophobic ALP scenario, where DM primarily couples to SM fermions, weaker constraints on DM mass can be obtained, indicating potential for a wider range of mass values. Future facilities like the Vera C. Rubin observatory are expected to significantly improve current bounds on DM mass, potentially reaching up to 80 keV.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Dhong Yeon Cheong, Sung Mook Lee, Seong Chan Park
Summary: Research shows that primordial black holes can be produced in a minimal UV extension of Higgs inflation with an included R-2 term. Parameters consistent with Standard Model measurements and Planck observation results indicate that M-PBH falls within the range of (10^(-16), 10^(-15))M⊙, with significant abundance, potentially making up the majority of dark matter.
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
John Ellis, Marcos A. G. Garcia, Natsumi Nagata, Dimitri Nanopoulos, Keith A. Olive
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2019)
Article
Astronomy & Astrophysics
John Ellis, Marcos A. G. Garcia, Natsumi Nagata, Dimitri Nanopoulos, Keith A. Olive
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Physics, Particles & Fields
John Ellis, Marcos A. G. Garcia, Natsumi Nagata, Dimitri Nanopoulos, Keith A. Olive
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Astronomy & Astrophysics
Marcos A. G. Garcia, Mustafa A. Amin, Daniel Green
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Astronomy & Astrophysics
C. A. Escobar, A. Martin-Ruiz, O. J. Franca, Marcos A. G. Garcia
Review
Astronomy & Astrophysics
John Ellis, Marcos A. G. Garcia, Natsumi Nagata, Dimitri V. Nanopoulos, Keith A. Olive, Sarunas Verner
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
(2020)
Article
Astronomy & Astrophysics
Marcos A. G. Garcia
Summary: This paper provides a concise summary of out-of-equilibrium dark matter production during post-inflationary reheating, highlighting the sensitivity of dark matter relic abundance to the thermalization rate of the inflaton decay products and the subsequent evolution of the temperature of thermalized radiation. It also discusses how smoking-gun signals such as monochromatic neutrinos, gamma-ray lines, or Lyman-alpha data can help constrain out-of-equilibrium dark matter models.
ASTRONOMISCHE NACHRICHTEN
(2021)
Article
Astronomy & Astrophysics
Marcos A. G. Garcia, Yann Mambrini, Keith A. Olive, Sarunas Verner
Summary: In this study, models for inflation with a stable inflaton and reheating through scattering processes are considered. It is shown that for a relatively large coupling, reheating is almost instantaneous leading to a relatively high reheating temperature. It is argued that such models can be derived from no-scale supergravity, leading to a scalar singlet dark matter candidate and Higgs portal model.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Marcos A. G. Garcia, Kunio Kaneta, Yann Mambrini, Keith A. Olive, Sarunas Verner
Summary: This article investigates the production of dark matter during the process of reheating after inflation. By comparing perturbative and non-perturbative calculations of energy density and considering the instability of final state scalar products, the resulting relic density based on different approaches is compared. It is shown that the present-day cold dark matter density can be obtained through freeze-in from preheating for a large range of dark matter masses.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
John Ellis, Marcos A. G. Garcia, Dimitri Nanopoulos, Keith A. Olive, Sarunas Verner
Summary: Recent BICEP/Keck data, combined with previous WMAP and Planck data, provide strong new constraints on the tilt in the scalar perturbation spectrum (n(s)) and the tensor-to-scalar ratio (r). These constraints are evaluated in attractor models of inflation formulated in no-scale supergravity, and they determine the number of e-folds of inflation (N-*), the magnitude of the inflaton coupling to matter (y), and the reheating temperature (T-reh). The 68% C.L. region prefers large values of N-*, y, and T-reh, which are constrained by the production of gravitinos and supersymmetric dark matter.
Article
Astronomy & Astrophysics
Emilian Dudas, Marcos A. G. Garcia, Yann Mambrini, Keith A. Olive, Marco Peloso, Sarunas Verner
Summary: It has been argued that in supergravity models of inflation with vanishing sound speeds, the production rate of gravitinos may grow unboundedly. However, certain models can prevent this issue, such as those involving the mixing of Goldstino and inflatino in a time-varying background, and models that eliminate the inflatino.
Article
Astronomy & Astrophysics
Marcos A. G. Garcia, Yann Mambrini, Keith A. Olive, Sarunas Verner
Article
Astronomy & Astrophysics
Marcos A. G. Garcia, Kunio Kaneta, Yann Mambrini, Keith A. Olive
Article
Astronomy & Astrophysics
Thomas Helfer, Eugene A. Lim, Marcos A. G. Garcia, Mustafa A. Amin
