337 citations · 1.6k across the 31 of their papers we have counts for
11 papers · 1 filter
Dark Matter spikes around Sgr A* in -rays
Shyam Balaji, Divya Sachdeva, Filippo Sala +1
We use H.E.S.S. -ray observations of Sgr A* to derive novel limits on the Dark Matter (DM) annihilation cross-section. We quantify their dependence on uncertainties i) in the DM…
Light scalar explanation for 18 TeV GRB 221009A
Shyam Balaji, Maura E. Ramirez-Quezada, Joseph Silk +1
Recent astrophysical transient Swift J1913.1+1946 may be associated with the -ray burst GRB 221009A. The redshift of this event is . Very high-energy -rays (up…
Improved stellar limits on a light CP-even scalar
Shyam Balaji, P. S. Bhupal Dev, Joseph Silk +1
We derive improved stellar luminosity limits on a generic light CP-even scalar field mixing with the Standard Model (SM) Higgs boson from the supernova SN1987A, the Sun, red gi…
Asymmetry in flavour changing electromagnetic transitions of vector-like quarks
Shyam Balaji
Vector-like quarks have been of interest for a plethora of experimentally motivated reasons and have come under increased investigation recently due to their inclusion to the Stand…
Cosmological bubble friction in local equilibrium
Shyam Balaji, Michael Spannowsky, Carlos Tamarit
In first-order cosmological phase transitions, the asymptotic velocity of expanding bubbles is of crucial relevance for predicting observables like the spectrum of stochastic gravi…
asymmetries in the rare top decays and
Shyam Balaji
The rare radiative flavour changing top decays and (and the even rarer and ) have been processes of interest for decades as they offer a key…
CP violation in neutral lepton transition dipole moment
Shyam Balaji, Maura Ramirez-Quezada, Ye-Ling Zhou
The violation in the neutrino transition electromagnetic dipole moment is discussed in the context of the Standard Model with an arbitrary number of right-handed singlet neutr…
Unified SU(4) theory for the and anomalies
Shyam Balaji, Michael A. Schmidt
We propose a chiral Pati-Salam theory based on the gauge group . The left-handed quarks and leptons are unified into a fundamental representati…
CP violation and circular polarisation in neutrino radiative decay
Shyam Balaji, Maura Ramirez-Quezada, Ye-Ling Zhou
The radiative decay of neutral fermions has been studied for decades but violation induced within such a paradigm has evaded attention. violation in these processes can p…
More stringent constraints on the unitarised fermionic dark matter Higgs portal
Shyam Balaji, Archil Kobakhidze
We revisit the simplest model of Higgs portal fermionic dark matter. The dark matter in this scenario is thermally produced in the early universe due to the interactions with the H…
A chiral SU(4) explanation of the anomalies
Shyam Balaji, Robert Foot, Michael A. Schmidt
We propose a variant of the Pati-Salam model, with gauge group , in which the chiral left-handed quarks and leptons are unified into a $\unde…