Minimal model of torsion mediated dark matter

Abstract

We present a minimal model of fermionic dark matter (DM), where a singlet Dirac fermion can interact with the Standard Model (SM) particles via the torsion field of gravitational origin. In general, torsion can be realized as an antisymmetric part of the affine connection associated with the spacetime diffeomorphism symmetry and thus can be thought of as a massive axial vector field. Because of its gravitational origin, the torsion field couples to all the fermion fields including the DM with equal strength, which makes the model quite predictive. The DM is naturally stable without any imposition of ad-hoc symmetry e.g., Z 2 .Apart from producing the correct thermal abundance, singlet fermion can easily evade the stringent bounds on the spin-independent DM-nucleon direct detection cross-section due to its axial nature. However, in the allowed parameter space, strong bounds can be placed on the torsion mass and its couplings to fermions from the recent LHC searches. Assuming a non universal torsion-DM and torsion-SM coupling, smaller values of torsion masses may become allowed. In both cases we also study the reach of spin-dependent direct detection searches of the DM. * bb1988@iitg.ac.in † tapobroto.bhanja@iitg.ac.in ‡ debottam@iopb.res.in § debu@iitg.res.in

Coupling Metric-Affine Gravity to a Higgs-Like Scalar Field

“…5 The different formulations of GR have manifold cosmological implications. An incomplete list of relevant works includes [45,47,48,63,64,67,[89][90][91][92][93][94][95][96][97][98][99][100][101][102][103] for the case of Einstein-Cartan gravity and [43,51,[104][105][106][107][108][109][110] for generic metric-affine theories (see [111] for a guide to the literature up to 2004). 6 The existence and characteristics of these effects due to torsion and non-metricity depend on the choice of gravitational formulation.…”

IOT based performance display system using ESP32: design and development

“…In our daily life we use to analyse quality parameters of water like: pH, electrical conductivity, turbidity, temperature as well as its flow, level and other parameters monitoring devices can also be controlled and handled efficiently by using this existing technology [3], [4]. In school, college and other public places digital notice boards are one of its vital applications [5], [6], [7], [8], [9]. In the industries smoke, humidity detector and entire control of SCADA system can be monitored utilising ESP32 microcontroller based developed IOT system [10], [11].…”

Cancellation in Dark Matter-Nucleon Interactions: the Role of Non-Standard-Model-like Yukawa Couplings

“…For M DM ∼ 1 TeV, the upper bound on the DM-nucleon scattering cross section goes to about 10 −11 pb. Obviously, such precise measurements would put strong constraints on the parameter spaces of several simple extensions of the Standard Model (SM), like the Z-portal [13][14][15][16][17], torsion-portal [18], Higgs-portal (H-portal) [19][20][21][22][23][24][25][26][27][28][29], Z -portal [30][31][32][33][34][35][36][37][38], or the pseudoscalar-portals [39][40][41] etc. (see [42] for a review).…”