40 citations · 103 across the 18 of their papers we have counts for
19 papers
Constraining axion quadratic couplings with the Hulse-Taylor binary system
Ziwen Yin, Shyam Balaji, Malcolm Fairbairn +1
The orbital evolution of the Hulse-Taylor binary neutron star system is described to high precision by general relativity, in which gravity is the only long-range force and gravita…
A Solar Probe of Dark Matter Decay in the Galaxy
Maximilian Detering, Shyam Balaji
Dark matter (DM) particles decaying in the Galactic halo can inject energetic that inverse-Compton scatter (ICS) solar photons into -rays, producing a diffuse and extend…
Spontaneous Baryogenesis and Primordial Black Hole Dark Matter from Ultra-Slow-Roll Inflation
Shyam Balaji
We propose a unified framework where the totality of dark matter (DM), the baryon asymmetry of the universe, and a detectable stochastic gravitational wave (GW) background originat…
The COSMIC WISPers White Paper: The physics case for Weakly Interacting Slim Particles
Ariel Arza, Deniz Aybas, Shyam Balaji +124
Axions and other very weakly interacting slim particles (WISPs), with masses below 1 GeV, arise naturally in many extensions of the Standard Model of particle physics. In particula…
An Excited Dark Matter Solution to the MeV Galactic Center Excesses
Shyam Balaji, Damon Cleaver, Pedro De la Torre Luque
Recent COMPTEL data analysis reveals a 2 MeV continuum excess whose spatial distribution closely matches the long-standing 511 keV line observed by INTEGRAL/SPI, indicating…
INTEGRAL, eROSITA and Voyager Constraints on Light Bosonic Dark Matter: ALPs, Dark Photons, Scalars, and Vectors
Thong T. Q. Nguyen, Pedro De la Torre Luque, Isabelle John +3
The decay of light bosonic dark matter particles can produce a bright electron/positron () flux that can be strongly constrained by local Voyager observations of the direct…
Dark Matter in X-rays: Revised XMM-Newton Limits and New Constraints from eROSITA
Shyam Balaji, Damon Cleaver, Pedro De la Torre Luque +1
We investigate two classes of dark matter (DM) candidates, sub-GeV particles and primordial black holes (PBHs), that can inject low-energy electrons and positrons into the Milky Wa…
Primordial black holes and magnetic fields in conformal neutrino mass models
Shyam Balaji, João Gonçalves, Danny Marfatia +2
Sufficiently strong and long-lasting first-order phase transitions can produce primordial black holes (PBHs) that contribute substantially to the dark matter abundance of the Unive…
In-flight positron annihilation as a probe of feebly interacting particles
Shyam Balaji, Pierluca Carenza, Pedro De la Torre Luque +2
Core-collapse supernovae (SNe) provide a unique environment to study Feebly Interacting Particles (FIPs) such as Axion-Like Particles (ALPs), sterile neutrinos, and Dark Photons (D…
511 keV Galactic Photons from a Dark Matter Spike
Pedro De la Torre Luque, Shyam Balaji, Malcolm Fairbairn +2
We propose that a dark matter (DM) spike around the Galactic Center's (GC) supermassive black hole, Sgr A*, could account for most of the bulge's measured 511 keV line intensity wh…
Anomalous Ionization in the Central Molecular Zone by sub-GeV Dark Matter
Pedro De la Torre Luque, Shyam Balaji, Joseph Silk
We demonstrate that the anomalous ionization rate observed in the Central Molecular Zone can be attributed to MeV dark matter annihilations into pairs for galactic dark ma…
Supermassive black holes from inflation constrained by dark matter substructure
Shin'ichiro Ando, Shyam Balaji, Malcolm Fairbairn +2
Recent James Webb Space Telescope observations of high-redshift massive galaxy candidates have initiated renewed interest in the important mystery around the formation and evolutio…
Multimessenger constraints for electrophilic feebly interacting particles from supernovae
Pedro De la Torre Luque, Shyam Balaji, Pierluca Carenza
Several extensions of the Standard Model predict the existence of sub-GeV particles that can be copiously produced in the cores of supernovae. A broad family of these particles are…
Refining Galactic primordial black hole evaporation constraints
Pedro De la Torre Luque, Jordan Koechler, Shyam Balaji
We revisit the role of primordial black holes (PBHs) as potential dark matter (DM) candidates, particularly focusing on light asteroid-mass PBHs. These PBHs are expected to emit pa…
rays from in-flight positron annihilation as a probe of new physics
Pedro De la Torre Luque, Shyam Balaji, Pierluca Carenza +1
The ray emission originating from in-flight annihilation (IA) of positrons is a powerful observable for constraining high-energy positron production from exotic sources. By com…
Probing modified Hawking evaporation with gravitational waves from the primordial black hole dominated universe
Shyam Balaji, Guillem Domènech, Gabriele Franciolini +2
It has been recently proposed that Hawking evaporation might slow down after a black hole has lost about half of its mass. Such an effect, called "memory burden", is parameterized…
Magnetogenesis with gravitational waves and primordial black hole dark matter
Shyam Balaji, Malcolm Fairbairn, Maria Olalla Olea-Romacho
Strongly supercooled first order phase transitions (FOPTs) can produce primordial black hole (PBH) dark matter (DM) along with observable gravitational waves (GWs) from bubble coll…
New 511 keV line data provides strongest sub-GeV dark matter constraints
Pedro De la Torre Luque, Shyam Balaji, Joseph Silk
We explore the ~keV emission associated to sub-GeV dark matter (DM) particles that can produce electron-positron pairs and form positronium after thermalizing. We use …
Importance of cosmic ray propagation on sub-GeV dark matter constraints
Pedro De la Torre Luque, Shyam Balaji, Jordan Koechler
We study sub-GeV dark matter (DM) particles that may annihilate or decay into SM particles producing an exotic injection component in the Milky Way that leaves an imprint in both p…