Results 41 to 50 of about 20,902 (149)

What are the Building Blocks of Our Universe? [PDF]

, 2004
We are told that we are living in a Golden Age of Astronomy. Cosmological Parameters are found with un precedented accuracy. Yet, the known form of matter forms only a small fraction of the total energy density of the universe.
Wali, Kameshwar C.
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Conformal transformations and Nordstr\"om's scalar theory of gravity

, 2010
As we shall briefly recall, Nordstr\"om's theory of gravity is observationally ruled out. It is however an interesting example of non-minimal coupling of matter to gravity and of the role of conformal transformations.
Deruelle, Nathalie, Sasaki, Misao
core   +1 more source

Resonance enhancement of dark matter interactions: the case for early kinetic decoupling and velocity dependent resonance width

Journal of High Energy Physics, 2017
Motivated by the possibility of enhancing dark matter (DM) self-scattering cross-section σ self , we have revisited the issue of DM annihilation through a Breit-Wigner resonance.
M. Duch, B. Grzadkowski
doaj   +1 more source

Physics of the linear collider

, 2003
This presentation intends to illustrate the specific capabilities of an e$^+$e$^-$ sub-TeV collider to provide answers on the basic issues in physics: origin of mass, hierarchy of masses, cosmological problems.
F. RICHARD, Rizzo T. G.
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Nambu-Goldstone Affleck-Dine baryogenesis

Journal of High Energy Physics, 2019
The Affleck-Dine mechanism creates the baryon asymmetry of the universe from an angular motion of a complex scalar field. The mechanism is efficient and allows for a low reheating temperature of the universe if the scalar field has a flat potential along
Keisuke Harigaya
doaj   +1 more source

WIMP cogenesis for asymmetric dark matter and the baryon asymmetry

Journal of High Energy Physics, 2020
We propose a new mechanism where asymmetric dark matter (ADM) and the baryon asymmetry are both generated in the same decay chain of a metastable weakly interacting massive particle (WIMP) after its thermal freezeout.
Yanou Cui, Michael Shamma
doaj   +1 more source

Dark matter freeze-in from semi-production

Journal of High Energy Physics, 2021
We study a novel dark matter production mechanism based on the freeze-in through semi-production, i.e. the inverse semi-annihilation processes. A peculiar feature of this scenario is that the production rate is suppressed by a small initial abundance of ...
Andrzej Hryczuk, Maxim Laletin
doaj   +1 more source

Enhanced n-body annihilation of dark matter and its indirect signatures

Journal of High Energy Physics, 2019
We examine the possible indirect signatures of dark matter annihilation processes with a non-standard scaling with the dark matter density, and in particular the case where more than two dark matter particles participate in the annihilation process.
Mohammad Hossein Namjoo, Tracy R. Slatyer, Chih-Liang Wu   +2 more
doaj   +1 more source

Constraints on axions from cosmic distance measurements

Journal of High Energy Physics, 2022
Axion couplings to photons could induce photon-axion conversion in the presence of magnetic fields in the Universe. This conversion could impact various cosmic distance measurements, such as luminosity distances to type Ia supernovae and angular ...
Manuel A. Buen-Abad, JiJi Fan, Chen Sun
doaj   +1 more source

Can Dark Matter be an artifact of extended theories of gravity?

, 2016
In this article, we propose different background models of extended theories of gravity, which are minimally coupled to the SM fields, to explain the possibility of genesis of dark matter without affecting the SM particle sector.
Choudhury, Sayantan, Sadhukhan, Soumya, Sen, Manibrata   +2 more
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