Cosmological model

Part 2 book "Particle and astroparticle physics - Problems and solutions" includes content: Interactions and field theories; the higgs mechanism and the standard model of particle physics; the standard model of cosmology and the dark universe; the properties of neutrinos; messengers from the high energy universe; astrobiology and the relation of fundamental physics to life.

200p muasambanhan10 06-04-2024 5 0   Download

Part 2 book "Introduction to particle physics" includes content: Gauge theory of electroweak unification; theory of strong interaction - QCD; neutrino oscillation; beyond standard model; particle physics and cosmology; epilogue.

373p muasambanhan09 16-03-2024 1 1   Download

Part 1 of ebook "Introduction to particle and astroparticle physics: Multimessenger astronomy and its particle physics foundations" provides readers with contents including: understanding the universe, cosmology, astrophysics, particles, and their interactions; basics of particle physics; cosmic rays and the development of particle physics; particle detection; particles and symmetries;...

290p dangsovu 20-10-2023 4 3   Download

Continued part 1, part 2 of ebook "Introduction to particle and astroparticle physics: Multimessenger astronomy and its particle physics foundations" provides readers with contents including: interactions and field theories; the higgs mechanism and the standard model of particle physics; the standard model of cosmology and the dark universe; the properties of neutrinos; messengers from the high-energy universe; astrobiology and the relation of fundamental physics to life;...

465p dangsovu 20-10-2023 3 3   Download

Continued part 1, part 2 of ebook "Introduction to general relativity: A course for undergraduate students of physics" provides readers with contents including: Chapter 9 - Classical tests of general relativity; Chapter 10 - Black holes; Chapter 11 - Cosmological models; Chapter 12 - Gravitational waves; Chapter 13 - Beyond Einstein's gravity;...

168p dangsovu 20-10-2023 5 3   Download

Searching for the origin of the dark matter and the dark energy is among the problems that the modern physics, including the general theory of relativity, is facing to. Various theories or models have been proposed to solve these problems without satisfactory success yet.

12p viberkshire 09-08-2023 6 5   Download

We consider a renormalizable theory, which successfully explains the number of Standard Model (SM) fermion families and whose non-SM scalar sector includes an axion dark matter as well as a field responsible for cosmological inflation. In such theory, the axion gets its mass via radiative corrections at one-loop level mediated by virtual top quark, right handed Majorana neutrinos and SM gauge bosons.

8p nhanchienthien 25-07-2023 5 3   Download

Dark matter must be stabilized over the cosmological timescale, which demands the existence of a stabilizing symmetry, derived by a dark charge. The relic density and direct detection for the scenario of two-component dark matter are investigated in detail.

15p vispiderman 15-06-2023 2 2   Download

In this work (Mathews et al., 2014a) we consider that the present universe is slightly open, i.e. ⌦0 0.994 at the 95% confidence level. In this case, any curvature that existed before inflation could now be visible on the horizon. Such pre-inflation fluctuations in the inflaton field could appear as a cosmic dark (or bulk) flow cosmological flow. We summarize an analytic model (KurkiSuonio et al., 1991; Mathews et al., 2014a) for an open cosmology with an adiabatic planar inhomogeneity of wavelength less than the initial Hubble scale.

5p runordie3 27-06-2022 9 3   Download

In this paper, therefore, we explore the possibility that the universe is slightly open with Ω0 ≈ 0.994. In this case a glimpse of preinflation fluctuations could just now be entering the horizon before the universe becomes totally dark-energy dominated and flat. Our goal, therefore, is to determine what constraints might be placed on inhomogeneities and curvature content in the preinflation universe based upon current cosmological observations.

8p runordie3 27-06-2022 10 3   Download

We discuss a cosmology in which cold dark-matter begins to decay into relativistic particles at a recent epoch (z < 1). We show that the large entropy production and associated bulk viscosity from such decays leads to a recently accelerating cosmology consistent with observations. We investigate the effects of decaying cold dark matter in a Λ = 0, flat, initially matter dominated cosmology. We show that this model satisfies the cosmological constraint from Type Ia supernovae at high redshift. Possible additional observational tests of this new cosmological paradigm are suggested.

8p thienlangso 15-12-2021 14 0   Download

Despite the prediction of the Higgs boson at Large Hadron Collider (LHC) in the CERN in 2012 after it has been theorized for over 50 years, however, the Standard model (SM) still can not explain the mass of neutrinos; the hierarchy problem; the contribution of dark energy, dark matter and CP violation in cosmology.

7p tamynhan9 02-12-2020 9 1   Download

We find that this model can only fit the observational constraints if there is a cosmological constant and the presence of non-decaying cold dark matter in addition to decaying cold dark matter. Thus, although this remains a viable model, it is only able to partially explain the observed cosmic acceleration.

9p tamynhan8 04-11-2020 14 2   Download

The patterns of high temperature symmetry non-restoration (SNR) and inverse symmetry braking (ISB) in the Z2 × Z2 model are investigated in detail for a specified parameters.

9p nguyenxuankha_bevandan 14-08-2020 10 1   Download

Dark matter (DM) is a special matter kind. The total amount of dark matter should be around five times bigger than that of ordinary matter. Currently, there are many dark matter models, such as the Cold Dark Matter model with a cosmological constant (ΛCDM) [1] and the vector-fermion dark matter model.

7p nguathienthan6 06-07-2020 6 1   Download

Locally rotationally symmetric five dimensional string cosmological model with bulk viscous fluid in Lyra manifold is constructed. This model is obtained for time dependent displacement field, i.e. β = β(t) and constant bulk viscous coefficient. Some physical and geometrical properties of the model are discussed.

9p 12120609 01-06-2020 15 0   Download

By expanding the calculations we investigated a four-nucleon model of the nucleus which takes into account the delta meson. The main results show that without the addition of Goguta-Bodmer, the expected compression value is still obtained, and the slope and curvature of the symmetrical energy are also consistent with the experiment.

11p vigustavia2711 19-12-2019 18 0   Download

In particular, we will show that the studied models really admit the Bianchi type I metrics, which are homogeneous but anisotropic space time, as their stable cosmological solutions. Hence, these models turn out to be counterexamples to the cosmic no-hair conjecture.

12p viposeidon2711 17-09-2019 15 0   Download

This paper discusses about Robertson-Walker space-time with quadratic equation of state and dynamical cosmological parameter Λ. Some exact solutions of Einstein’s field equations for three cases have been obtained. Physical behaviors of the models are discussed in detail.

8p thuyliebe 09-10-2018 26 0   Download

The former leads to a ”microscopic” cosmological model with Hubble expansion. Due to interaction of a Higgs-like cosmological potential, the original time-space symmetry is spontaneously broken, inducing a strong time-like curvature and a weak space-like deviation curve. In the result, the wave-like solution leads to Klein-Gordon-Fock equation which would serve an explicit approach to the problem of consistency between quantum mechanics and general relativity.

12p thuyliebe 08-10-2018 20 0   Download