179 citations · 1k across the 58 of their papers we have counts for
14 papers · 1 filter
Kinematical correlations via -Poincaré coproducts
Mohammad Ali Gorji, Babak Vakili
We study a kinematical consequence of the Hopf-algebraic momentum composition law in -Minkowski spacetime. The same curved momentum space can be described in different coordinat…
Covariant scalar-tensor theories beyond second derivatives
Mohammad Ali Gorji, Pavel Petrov, Karim Noui
We propose a covariant, gauge-independent construction of foliation-based scalar-tensor theories, yielding diffeomorphism-invariant operators involving only gradients on the hypers…
Linear Higher-Order Maxwell-Einstein-Scalar Theories
Mohammad Ali Gorji, Shinji Mukohyama, Pavel Petrov +1
In the context of the Higher-Order Maxwell-Einstein-Scalar (HOMES) theories, which are invariant under spacetime diffeomorphisms and gauge symmetry, we study two broad subcl…
A no-go theorem in bumblebee vector-tensor cosmology
Carsten van de Bruck, Mohammad Ali Gorji, Nils A. Nilsson +2
Bumblebee models, a class of vector-tensor theories in which a vector field acquires a nonzero vacuum expectation value that spontaneously breaks spacetime symmetries, are ubiquito…
Effective Field Theory of Black Hole Perturbations in Vector-Tensor Gravity
Katsuki Aoki, Mohammad Ali Gorji, Shinji Mukohyama +2
We formulate the effective field theory (EFT) of vector-tensor gravity for perturbations around an arbitrary background with a vector profile, which can be applied…
Effective Field Theory of Gravitating Continuum: Solids, Fluids, and Aether Unified
Katsuki Aoki, Mohammad Ali Gorji, Shinji Mukohyama +1
We investigate the relativistic effective field theory (EFT) describing a non-dissipative gravitating continuum. In addition to ordinary continua, namely solids and fluids, we find…
The Effective Field Theory of Vector-Tensor Theories
Katsuki Aoki, Mohammad Ali Gorji, Shinji Mukohyama +1
We investigate a systematic formulation of vector-tensor theories based on the effective field theory (EFT) approach. The input of our EFT is that the spacetime symmetry is spontan…
Inflation with
Mohammad Ali Gorji, Hayato Motohashi, Shinji Mukohyama
We investigate a novel single field inflationary scenario which allows a transition between a slow-roll k-inflation with of order unity and a ghost inflation with $ c_{…
Schwinger Mechanism During Inflation
Soroush Shakeri, Mohammad Ali Gorji, Hassan Firouzjahi
We revisit the efficiency of Schwinger mechanism in creating charged pairs during inflation. We consider a minimal setup of inflation in which the inflaton field is a complex scala…
Charged Vector Inflation
Hassan Firouzjahi, Mohammad Ali Gorji, Seyed Ali Hosseini Mansoori +2
We present a model of inflation in which the inflaton field is charged under a triplet of gauge fields. The model enjoys an internal symmetry supporting the isotropic…
Gauge Field Mimetic Cosmology
Mohammad Ali Gorji, Shinji Mukohyama, Hassan Firouzjahi +1
We extend the mimetic cosmology to models containing gauge invariant -forms. The -form case reproduces the well-known results of the mimetic dark matter, the -form corresp…
Instabilities in Mimetic Matter Perturbations
Hassan Firouzjahi, Mohammad Ali Gorji, Seyed Ali Hosseini Mansoori
We study cosmological perturbations in mimetic matter scenario with a general higher derivative function. We calculate the quadratic action and show that both the kinetic term and…
High temperature dimensional reduction in Snyder space
K. Nozari, V. Hosseinzadeh, M. A. Gorji
In this paper, we formulate the statistical mechanics in Snyder space that supports the existence of a minimal length scale. We obtain the corresponding invariant Liouville volume…
Entropy bound for the photon gas in noncommutative spacetime
K. Nozari, M. A. Gorji, A. Damavandi Kamali +1
Motivated by the doubly special relativity theories and noncommutative spacetime structures, thermodynamical properties of the photon gas in a phase space with compact spatial mome…