57 citations · 190 across the 20 of their papers we have counts for
20 papers
Spin Trio: a dark matter scenario
Mohammad Hossein Rahimi Abkenar, Ahmad Mohamadnejad, Reza Sepahvand
We investigate a beyond Standard Model (SM) featuring five new fields. Four fields encompassing three distinct spin states - scalar (), spinor (), and vector ($ V_μ…
Gravitational wave in a filtered vector dark matter model
Mojtaba Hosseini, Seyed Yaser Ayazi, Ahmad Mohamadnejad
We consider a first order phase transition (FOPT) for a Vector Dark Matter (VDM) in the early universe in which its mass may partially arise from such mechanism in the hidden secto…
Gravitational wave effects and phenomenology of a two-component dark matter model
Mojtaba Hosseini, Seyed Yaser Ayazi, Ahmad Mohamadnejad
We study an extension of the Standard Model (SM) which could have two candidates for dark matter (DM) including a Dirac fermion and a vector dark matter (VDM) under a new ga…
Thermal Leptophilic Light Vector Dark Matter with Spinor Mediator and Muon (g-2) Anomaly
Seyed Yaser Ayazi, Ahmad Mohamadnejad
Inspired by the recently new measurement of at FermiLab and reported upper bound for electron-dark matter (DM) recoil by the XENON1T collaboration, we revisited phenomeno…
Electroweak phase transition and gravitational waves in a two-component dark matter model
Ahmad Mohamadnejad
We investigate an extension of the Standard Model (SM) with two candidates for dark matter (DM). One of them is a real scalar field and the other is an Abelian gauge field. Except…
DAMPE Excess from Leptophilic Vector Dark Matter: Model Independent Approach
Seyed Yaser Ayazi, Ahmad Mohamadnejad
We study all extensions of the Standard Model (SM) with a vector dark matter (VDM) candidate which can explain the peak structure observed by recent DAMPE experiment in electron-po…
Gravitational waves from scale-invariant vector dark matter model: Probing below the neutrino-floor
Ahmad Mohamadnejad
We study the gravitational waves (GWs) spectrum produced during the electroweak phase transition in a scale-invariant extension of the Standard Model (SM), enlarged by a dark $ U(1…
Accidental scale-invariant Majorana dark matter in leptoquark-Higgs portals
Ahmad Mohamadnejad
We study a classically accidental scale-invariant extension of the Standard Model (SM) containing three additional fields, a vector leptoquark (), a real scalar (), and…
Conformal vector dark matter and strongly first-order electroweak phase transition
Seyed Yaser Ayazi, Ahmad Mohamadnejad
We study a conformal version of the Standard Model (SM), which apart from SM sector, containing a dark sector with a vector dark matter candidate and a scalar field (s…
Scale-Invariant Two Component Dark Matter
Seyed Yaser Ayazi, Ahmad Mohamadnejad
We study a scale invariant extension of the standard model which can explain simultaneously dark matter and the hierarchy problem. In our set-up, we introduce a scalar and a spinor…
Cosmological evolution of the proton-to-electron mass ratio in an extended Brans-Dicke theory
Ahmad Mohamadnejad
We study variation of the proton-to-electron mass ratio by incorporating standard model (SM) of particle physics into an extended Brans-Dicke theory. We show that…
Searching for Vector-Like Quarks in a Fermionic Dark Matter Model with Pseudoscalar: A Resonance Case
Seyed Yaser Ayazi, Ahmad Mohamadnejad, S. Peyman Zakeri
We propose a minimal model of a fermionic dark matter with a pseudoscalar mediator and N generation of vector-like quarks. We calculate the relic density and obtain new constraint…
Vacuum of the Standard Model and its Cosmological Aspects
Ahmad Mohamadnejad
Recently, we have proposed a definition for the vacuum and suggest a mechanism for symmetry breaking. In this mechanism extra massless fields, vacuum fields, arise. We apply our me…
Vacuum and Symmetry Breaking: New Approach
Ahmad Mohamadnejad
We propose a new mechanism for symmetry breaking in which, apart from particle degrees of freedom, topological degrees of freedom also emerge. In this method, a decomposition for t…
Skyrme-Faddeev Lagrangian from reformulated Georgi-Glashow model
Ahmad Mohamadnejad
Recently we proposed a decomposition for fields of the Georgi-Glashow model and interpreted Cho's decomposition as a result of some constraints on Georgi-Glashow's fields. Now, usi…
Reformulation of the Georgi-Glashow model and some constraints on its classical fields
Ahmad Mohamadnejad
We study the SU(2) Georgi-Glashow model and suggest a decomposition for its fields and obtain a Lagrangian based on new variables. We use Cho's restricted decomposition as a result…
Abelian-Higgs model from Cho-Faddeev-Niemi decomposition
Ahmad Mohamadnejad, Sedigheh Deldar
Applying Cho-Faddeev-Niemi decomposition for SU(2) Yang-Mills field, we obtain the Abelian-Higgs Lagrangian by some approximation. Abelian-Higgs Lagrangian with a spontaneous symme…
Appearance of vortices and monopoles in a decomposition of an SU(2) Yang-Mills field
Ahmad Mohamadnejad, Sedigheh Deldar
We show how vortices can appear in the low energy limit of a pure SU(2) Yang-Mills theory as topological solitons. Motivated by Abelian dominance, we suppose that in the infrared r…
A decomposition for SU(2) Yang-Mills fields
S. Deldar, A. Mohamadnejad
Motivated by Abelian dominance, we suppose that the field strength tensor in the low energy limit of the SU(2) Yang-Mills theory is , where is a space…
The thermodynamic properties of weakly interacting quark gluon plasma via the one gluon exchange interaction
Majid Modarres, Ahmad Mohamadnejad
The thermodynamic properties of the quark gluon plasma() as well as its phase diagram are calculated as a function of baryon density (chemical potential) and temperature. The…