64 citations · 318 across the 32 of their papers we have counts for
26 papers · 1 filter
Environment-dependent mass splitting to suppress solar capture in the inelastic-doublet interpretation of the LZ event
Sudhakantha Girmohanta, Tae Hyun Jung
The inelastic electroweak-doublet interpretation of the recoil energy event reported by LUX-ZEPLIN faces strong constraints from solar capture. We propose an envir…
Dark Transport Erases Baryon Inhomogeneity from Supercooled Phase Transitions
Sudhakantha Girmohanta, Kohei Kamada, Yuichiro Nakai +1
Supercooled phase transitions can generate observable gravitational waves, but their bubble dynamics may also imprint large spatial inhomogeneities in the baryon asymmetry. For pha…
Neutron Portal and Dark Matter-Baryon Coincidence: from UV Completion to Phenomenology
Sudhakantha Girmohanta, Yuichiro Nakai, Yoshihiro Shigekami +1
We present a dynamical solution to the dark matter-baryon coincidence problem based on the neutron portal operator connecting the visible and dark sector asymmetries. This framewor…
Postsphaleron darkogenesis
Sudhakantha Girmohanta, Yuichiro Nakai, Zhihao Zhang
A supercooled phase transition in a nearly conformal dark sector can provide a natural setting for darkogenesis via its out-of-equilibrium dynamics, where a particle-antiparticle n…
Implications of DESI for Dark Matter & Cosmic Birefringence
Basabendu Barman, Sudhakantha Girmohanta
We explore an interacting dark matter (DM)-dark energy (DE) framework that naturally yields an effective dynamical DE equation of state crossing the phantom barrier at early times,…
Quest for a phenomenologically consistent low cutoff theory
Sudhakantha Girmohanta, Yu-Cheng Qiu
The Randall-Sundrum model with the Higgs localized on the IR brane solves the gauge hierarchy problem. However, the associated low cutoff ( TeV) generically leads to unac…
Interplay of ALP Couplings at a Muon Collider
So Chigusa, Sudhakantha Girmohanta, Yuichiro Nakai +1
Axion-like particles can couple to Standard Model gluons, electroweak gauge bosons, and massive fermions. A future multi-TeV muon collider provides a favorable environment to probe…
Cold Darkogenesis: Dark Matter and Baryon Asymmetry in Light of the PTA Signal
Kohei Fujikura, Sudhakantha Girmohanta, Yuichiro Nakai +1
We build upon the intriguing possibility that the recently reported nano-Hz gravitational wave signal by Pulsar Timing Array (PTA) experiments is sourced by a strong first-order ph…
How Viable Is a QCD Axion near 10 MeV?
Sudhakantha Girmohanta, Shota Nakagawa, Yuichiro Nakai +1
There has been an attempt to revive the visible QCD axion at the 10 MeV scale assuming that it exclusively couples to the first-generation quarks and the electron. This variant of…
Light Dilaton in Rare Meson Decays and Extraction of its CP Property
Sudhakantha Girmohanta, Yuichiro Nakai, Yoshihiro Shigekami +1
The dilaton is a pseudo-Nambu-Goldstone boson associated with the spontaneous breaking of scale invariance in a nearly conformal theory, and couples to the trace of the stress-…
Aiming for Tops of ALPs with a Muon Collider
So Chigusa, Sudhakantha Girmohanta, Yuichiro Nakai +1
Future muon colliders with center-of-mass energy of TeV can provide a clean high-energy environment with advantages in searches for TeV-scale axion-like particl…
NANOGrav Signal from a Dark Conformal Phase Transition
Kohei Fujikura, Sudhakantha Girmohanta, Yuichiro Nakai +1
We explore the possibility that a confining first-order phase transition of a nearly-conformal dark sector generates the reported NANOGrav signal of a stochastic gravitational wave…
Multi-brane cosmology
Sudhakantha Girmohanta, Seung J. Lee, Yuichiro Nakai +1
5D warped extra dimension models with multiple 3-branes can naturally realize multiple hierarchical mass scales which are ubiquitous in physics beyond the Standard Model. We discus…
Model of the quintessence axion
Sudhakantha Girmohanta, Yu-Cheng Qiu, Jin-Wei Wang +1
We construct a model of the quintessence axion based on a gauged chiral symmetry and an additional flat fifth dimension. The required high qualities are guaranteed by the br…
Fitting a Self-Interacting Dark Matter Model to Data Ranging From Satellite Galaxies to Galaxy Clusters
Sudhakantha Girmohanta, Robert Shrock
We present a fit to observational data in an asymmetric self-interacting dark matter model using our recently calculated cross sections that incorporate both -channel and -ch…
Cross Section Calculations in Theories of Self-Interacting Dark Matter
Sudhakantha Girmohanta, Robert Shrock
We study an asymmetric dark matter model with self-interacting dark matter consisting of a Dirac fermion coupled to a scalar or vector mediator, such that the reaction $χ+ χ\to…
A Natural Model of Spontaneous CP Violation
Sudhakantha Girmohanta, Seung J. Lee, Yuichiro Nakai +1
We examine the possibility of building a natural non-supersymmetric model of spontaneous CP violation equipped with the Nelson-Barr (NB) mechanism to address the strong CP problem.…
An Extra-Dimensional Model of Dark Matter
S. Girmohanta, R. Shrock
We present a model for dark matter with extra spatial dimensions in which Standard-Model (SM) fermions have localized wave functions. The underlying gauge group is $G_{\rm SM} \oti…
Effective Leptophilic WIMPs at the collider
Basabendu Barman, Subhaditya Bhattacharya, Sudhakantha Girmohanta +1
We consider higher-dimensional effective (EFT) operators consisting of fermion dark matter (DM) connecting to Standard Model (SM) leptons upto dimension six. Considering all operat…
Neutrino Masses and Mixing in Models with Large Extra Dimensions and Localized Fermions
S. Girmohanta, R. N. Mohapatra, R. Shrock
Using a low-energy effective field theory approach, we study some properties of models with large extra dimensions, in which quarks and leptons have localized wave functions in the…
: A State of the Field, and Looking Forward--A brief status report of theoretical and experimental physics opportunities
Kaladi Babu, Joshua Barrow, Zurab Berezhiani +21
The origin of the matter-antimatter asymmetry apparently obligates the laws of physics to include some mechanism of baryon number () violation. Searches for interactio…
Nucleon and dinucleon decays to leptonic final states in a left-right symmetric model with large extra dimensions
Sudhakantha Girmohanta
We consider baryon-number-violating nucleon and dinucleon decays to leptonic final states in the context of a left-right symmetric (LRS) model with large extra dimensions. Specific…
Nucleon Decay and - Oscillations in a Left-Right Symmetric Model with Large Extra Dimensions
Sudhakantha Girmohanta, Robert Shrock
We study baryon-number-violating processes, including proton and bound neutron decays and oscillations, in a left-right-symmetric (LRS) model in which quarks and leptons…
Baryon-Number-Violating Nucleon and Dinucleon Decays in a Model with Large Extra Dimensions
Sudhakantha Girmohanta, Robert Shrock
It is known that limits on baryon-violating nucleon decays do not, in general, imply corresponding suppression of transitions. In the context of a model with fermions…