Joshua Wood

New limits on light dark matter-nucleon scattering

Peter Cox, Matthew J. Dolan, Joshua Wood

We derive new bounds on hadronically interacting, sub-GeV mass dark matter. First, we show that one-loop interactions with photons can be sufficient to maintain equilibrium between the dark matter and Standard Model sectors at MeV temperatures, resulting in constraints from big bang …

au (code pays fourni par la source)

GRB 250702B: Discovery of a Gamma-Ray Burst from a Black Hole Falling into a Star

Eliza Neights, Eric Burns, Chris L. Fryer, D. Svinkin et autres

Gamma-ray bursts are the most luminous electromagnetic events in the universe. Their prompt gamma-ray emission has typical durations between a fraction of a second and several minutes. A rare subset of these events have durations in excess of a thousand seconds, referred …

Fermi-GBM Observations of GRB 230307A: An Exceptionally Bright Long-Duration Gamma-ray Burst with an Associated Kilonova

Sarah Dalessi, P. Vereš, C. M. Hui, Suman Bala et autres

On March 7th, 2023 the \textit{Fermi} Gamma-ray Burst Monitor observed the second highest fluence gamma-ray burst (GRB) ever, GRB~230307A. With a duration beyond 100~s, GRB~230307A contains a multitude of rapidly-varying peaks, and was so bright it caused instrumental effects in the GBM …

New Limits on Light Dark Matter-Nucleon Scattering

Peter Cox, Matthew J. Dolan, Joshua Wood

We derive new bounds on hadronically-interacting, sub-GeV mass dark matter. First, we show that one-loop interactions with photons can be sufficient to maintain equilibrium between the dark matter and Standard Model sectors at MeV temperatures, resulting in constraints from Big Bang Nucleosynthesis. …

Prompt GRB recognition through waterfalls and deep learning

Michela Negro, Eric Burns, Joshua Wood, A. Goldstein et autres

Gamma-ray Bursts (GRBs) are one of the most energetic phenomena in the cosmos, whose study probes physics extremes beyond the reach of laboratories on Earth. Our quest to unravel the origin of these events and understand their underlying physics is far from …

fr (code pays fourni par la source)

Constraining possible $γ$-ray burst emission from GW230529 using Swift-BAT and Fermi-GBM

S. Ronchini, Suman Bala, Joshua Wood, James DeLaunay et autres

GW230529 is the first compact binary coalescence detected by the LIGO-Virgo-KAGRA collaboration with at least one component mass confidently in the lower mass-gap, corresponding to the range 3-5$M_{\odot}$. If interpreted as a neutron star-black hole merger, this event has the most symmetric …

Absorption of fermionic dark matter via the scalar portal

Peter Cox, Matthew J. Dolan, Joshua Wood

The absorption of fermionic dark matter has recently been studied as a signature for the direct detection of dark matter. We construct the first UV completion of the scalar effective operator associated with this signature. We calculate the constraints on the model …

au (code pays fourni par la source)

Absorption of Fermionic Dark Matter via the Scalar Portal

Peter Cox, Matthew J. Dolan, Joshua Wood

The absorption of fermionic dark matter has recently been studied as a signature for the direct detection of dark matter. We construct the first UV completion of the scalar effective operator associated with this signature. We calculate the constraints on the model …

au (code pays fourni par la source)

Creating a database of pulse waveforms for scintillator-based gamma-ray detectors

Joshua Wood, Dakota Davis

The first Gamma-ray Burst (GRB) counterpart to a gravitational wave event, GRB 170817A, proved that monitoring for gamma-ray transients is an essential part of multi-messenger astronomy. As a result, research teams, globally, are now working towards the next generation of GRB instruments. …

us (code pays fourni par la source)

Searches for Neutrinos from Gamma-Ray Bursts Using the IceCube Neutrino Observatory

Rasha Abbasi, M. Ackermann, J. Adams, J. A. Aguilar et autres

Abstract Gamma-ray bursts (GRBs) are considered as promising sources of ultra-high-energy cosmic rays (UHECRs) due to their large power output. Observing a neutrino flux from GRBs would offer evidence that GRBs are hadronic accelerators of UHECRs. Previous IceCube analyses, which primarily focused …

us, nz, be, dk, se, de, ca, ch, au, kr, tw (code pays fourni par la source)

Combined dark matter searches towards dwarf spheroidal galaxies with Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS

Céline Armand, Hassan Abdalla, Felix Aharonian, Faical Ait-Benkhali et autres

Cosmological and astrophysical observations suggest that 85% of the total matter of the Universe is made of Dark Matter (DM). However, its nature remains one of the most challenging and fundamental open questions of particle physics. Assuming particle DM, this exotic form …

de, fr, us, mx, ch (code pays fourni par la source)

Convolutional Neural Networks for Low Energy Gamma-Ray Air Shower Identification with HAWC

I. J. Watson, A. U. Abeysekara, A. Albert, Ruben Jose Alfaro et autres

A major task in ground-based gamma-ray astrophysics analyses is to separate events caused by gamma rays from the overwhelming hadronic cosmic-ray background. In this talk we are interested in improving the gamma ray regime below 1 TeV, where the gamma and cosmic-ray …

kr (code pays fourni par la source)