ORCID Profile
0000-0002-5805-9828
Current Organisation
University of Melbourne
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Atomic, Molecular, Nuclear, Particle and Plasma Physics | Particle Physics | High Energy Astrophysics; Cosmic Rays | Nuclear And Particle Physics | Nuclear Physics | Astronomical and Space Sciences not elsewhere classified | Cosmic Ray Physics | Synchrotrons; Accelerators; Instruments and Techniques | Distributed and Grid Systems
Expanding Knowledge in the Physical Sciences | Physical sciences | Emerging Defence Technologies | Scientific Instruments |
Publisher: American Physical Society (APS)
Date: 17-05-2022
Publisher: IOP Publishing
Date: 11-2022
DOI: 10.1088/1475-7516/2022/11/060
Abstract: The Hyper-Kamiokande (HyperK) experiment is expected to precisely measure the Diffuse Supernova Neutrino Background (DSNB). This requires that the backgrounds in the relevant energy range are well understood. One possible background that has not been considered thus far is the annihilation of low-mass dark matter (DM) to neutrinos. We conduct simulations of the DSNB signal and backgrounds in HyperK, and quantify the extent to which DM annihilation products can pollute the DSNB signal. We find that the presence of DM could affect the determination of the correct values of parameters of interest for DSNB physics, such as effective neutrino temperatures and star formation rates. While this opens the possibility of simultaneously characterising the DNSB and discovering dark matter via indirect detection, we argue that it would be hard to disentangle the two contributions due to the lack of angular information available at low energies.
Publisher: Springer Science and Business Media LLC
Date: 08-2016
Publisher: IOP Publishing
Date: 26-11-2014
Publisher: IOP Publishing
Date: 05-04-2011
Publisher: Elsevier BV
Date: 04-2000
Publisher: American Physical Society (APS)
Date: 05-01-2004
Publisher: IOP Publishing
Date: 19-01-2017
Publisher: American Physical Society (APS)
Date: 26-09-2008
Publisher: American Physical Society (APS)
Date: 15-09-2003
Publisher: American Physical Society (APS)
Date: 05-05-2005
Publisher: American Physical Society (APS)
Date: 23-12-2011
Publisher: American Physical Society (APS)
Date: 30-10-2014
Publisher: IOP Publishing
Date: 21-10-2025
Publisher: IOP Publishing
Date: 22-12-2022
Abstract: The nature of dark matter and properties of neutrinos are among the most pressing issues in contemporary particle physics. The dual-phase xenon time-projection chamber is the leading technology to cover the available parameter space for weakly interacting massive particles, while featuring extensive sensitivity to many alternative dark matter candidates. These detectors can also study neutrinos through neutrinoless double-beta decay and through a variety of astrophysical sources. A next-generation xenon-based detector will therefore be a true multi-purpose observatory to significantly advance particle physics, nuclear physics, astrophysics, solar physics, and cosmology. This review article presents the science cases for such a detector.
Publisher: American Physical Society (APS)
Date: 12-03-2010
Publisher: World Scientific Pub Co Pte Lt
Date: 2011
DOI: 10.1142/S2010194511000353
Abstract: We examine dark matter annihilation in galaxy halos. By considering annihilation into all Standard Model particles we show that the least detectable final states, namely neutrinos, define a strong general upper bound on the total cross section. This limit is much stronger than the unitarity bound in the most interesting mass range and implies annihilation cannot significantly modify dark matter halo density profiles. We also calculate conservative upper limits on the self-annihilation cross section to monoenergetic gamma rays over a wide range of dark matter masses, using gamma-ray data from the Milky Way, Andromeda (M31), and the cosmic background. We compare gamma-ray-based and neutrino-based upper limits on the total cross section.
Publisher: American Physical Society (APS)
Date: 28-11-2012
Publisher: Elsevier BV
Date: 02-2001
Publisher: American Physical Society (APS)
Date: 14-04-1999
Publisher: American Physical Society (APS)
Date: 26-07-2017
Publisher: IOP Publishing
Date: 17-07-2013
Publisher: American Physical Society (APS)
Date: 07-2005
Publisher: American Physical Society (APS)
Date: 14-10-2021
Publisher: American Physical Society (APS)
Date: 30-01-2004
Publisher: Springer Science and Business Media LLC
Date: 04-2021
Abstract: We examine the collider and dark matter phenomenology of the Standard Model extended by a hypercharge-zero SU(2) triplet scalar and gauge singlet scalar. In particular, we study the scenario where the singlet and triplet are both charged under a single ℤ 2 symmetry. We find that such an extension is capable of generating the observed dark matter density, while also modifying the collider phenomenology such that the lower bound on the mass of the triplet is smaller than in minimal triplet scalar extensions to the Standard Model. A high triplet mass is in tension with the parameter space that leads to novel electroweak phase transitions in the early universe. Therefore, the lower triplet masses that are permitted in this extended model are of particular importance for the prospects of successful electroweak baryogenesis and the generation of gravitational waves from early universe phase transitions.
Publisher: IOP Publishing
Date: 03-01-2019
Publisher: American Physical Society (APS)
Date: 22-01-2020
Publisher: American Physical Society (APS)
Date: 28-07-2021
Publisher: American Physical Society (APS)
Date: 16-11-2011
Publisher: American Physical Society (APS)
Date: 24-10-2008
Publisher: WORLD SCIENTIFIC
Date: 05-2008
Publisher: Elsevier BV
Date: 11-2011
Publisher: World Scientific Pub Co Pte Lt
Date: 28-06-2008
DOI: 10.1142/S0217732308028041
Abstract: We examine dark matter annihilation in the Universe today. We first discuss the suggestion that the Galactic positron flux, which is difficult to account for with astrophysical sources, is produced by the annihilation of dark matter in the Galactic halo. We show that the positrons produced would necessarily be accompanied by a flux of gamma rays which exceed observational constraints, unless the dark matter mass is very low. We shall also derive a very general bond on the dark matter annihilation cross section. By considering annihilation into all Standard Model particles, we show that the least detectable final states, namely neutrinos, define an upper bound on the total annihilation cross section. Calculating the cosmic diffuse neutrino signal, and comparing it to the measured terrestrial atmospheric neutrino background, we derive a robust limit that is much stronger than the unitarity bound in the most interesting mass range. We conclude that dark matter self-annihilation rates cannot be large enough to have a significant effect on the density profiles of dark matter halos.
Publisher: American Physical Society (APS)
Date: 07-12-2011
Publisher: IOP Publishing
Date: 28-06-2019
Publisher: IOP Publishing
Date: 25-10-2012
Publisher: American Physical Society (APS)
Date: 15-09-2015
Publisher: American Physical Society (APS)
Date: 04-10-2005
Publisher: American Physical Society (APS)
Date: 25-01-2019
Publisher: American Physical Society (APS)
Date: 21-10-2021
Publisher: AIP
Date: 2009
DOI: 10.1063/1.3293793
Publisher: American Physical Society (APS)
Date: 10-09-2021
Publisher: American Physical Society (APS)
Date: 05-12-2007
Publisher: Elsevier BV
Date: 2005
Publisher: American Physical Society (APS)
Date: 10-04-2002
Publisher: World Scientific Pub Co Pte Lt
Date: 30-10-2007
DOI: 10.1142/S0217751X07038256
Abstract: The existence of a neutrino magnetic moment implies contributions to the neutrino mass via radiative corrections. We derive model-independent "naturalness" upper bounds on the magnetic moments of Dirac and Majorana neutrinos, generated by physics above the electroweak scale. For Dirac neutrinos, the bound is several orders of magnitude more stringent than present experimental limits. However, for Majorana neutrinos the magnetic moment bounds are weaker than present experimental limits if μ ν is generated by new physics at ~ 1 TeV , and surpass current experimental sensitivity only for new physics scales 10 – 100 TeV . The discovery of a neutrino magnetic moment near present limits would thus signify that neutrinos are Majorana particles.
Publisher: American Physical Society (APS)
Date: 05-01-2015
Publisher: Elsevier BV
Date: 05-2003
Publisher: American Physical Society (APS)
Date: 15-11-2022
Publisher: Elsevier BV
Date: 11-2006
Publisher: American Physical Society (APS)
Date: 06-01-2011
Publisher: IOP Publishing
Date: 03-2021
DOI: 10.1088/1475-7516/2021/03/086
Abstract: Neutron stars harbour matter under extreme conditions, providing a unique testing ground for fundamental interactions. We recently developed an improved treatment of dark matter (DM) capture in neutron stars that properly incorporates many of the important physical effects, and outlined useful analytic approximations that are valid when the scattering litude is independent of the centre of mass energy. We now extend that analysis to all interaction types. We also discuss the effect of going beyond the zero-temperature approximation, which provides a boost to the capture rate of low mass dark matter, and give approximations for the dark matter up-scattering rate and evaporation mass. We apply these results to scattering of dark matter from leptonic targets, for which a correct relativistic description is essential. We find that the potential neutron star sensitivity to DM-lepton scattering cross sections greatly exceeds electron-recoil experiments, particularly in the sub-GeV regime, with a sensitivity to sub-MeV DM well beyond the reach of future terrestrial experiments.
Publisher: American Physical Society (APS)
Date: 24-06-2002
Publisher: IOP Publishing
Date: 08-2016
Publisher: American Physical Society (APS)
Date: 12-10-2020
Publisher: Springer Science and Business Media LLC
Date: 09-2019
Abstract: We investigate the viability of electroweak baryogenesis in a model with a first order electroweak phase transition induced by the addition of two gauge singlet scalars. A vector-like lepton doublet is introduced in order to provide CP violating interactions with the singlets and Standard Model leptons, and the asymmetry generation dynamics are examined using the vacuum expectation value insertion approximation. We find that such a model is readily capable of generating sufficient baryon asymmetry while satisfying electron electric dipole moment and collider phenomenology constraints.
Publisher: IOP Publishing
Date: 15-09-2020
Publisher: American Physical Society (APS)
Date: 27-09-2005
Publisher: Springer Science and Business Media LLC
Date: 05-2020
Publisher: American Physical Society (APS)
Date: 22-03-2006
Publisher: IOP Publishing
Date: 11-01-2018
Publisher: IOP Publishing
Date: 27-01-2016
Publisher: IOP Publishing
Date: 11-2008
Publisher: IOP Publishing
Date: 10-09-2018
Publisher: American Physical Society (APS)
Date: 12-04-1999
Publisher: American Physical Society (APS)
Date: 16-09-2004
Publisher: Elsevier BV
Date: 2020
Publisher: American Physical Society (APS)
Date: 29-07-2002
Publisher: American Physical Society (APS)
Date: 06-12-2001
Publisher: American Physical Society (APS)
Date: 28-10-2008
Publisher: American Physical Society (APS)
Date: 16-04-2002
Publisher: American Physical Society (APS)
Date: 16-07-2010
Publisher: American Physical Society (APS)
Date: 07-06-2013
Publisher: arXiv
Date: 2022
Publisher: American Physical Society (APS)
Date: 05-02-2009
Publisher: American Physical Society (APS)
Date: 02-06-2014
Publisher: American Physical Society (APS)
Date: 11-11-2003
Publisher: IOP Publishing
Date: 13-08-2018
Publisher: IOP Publishing
Date: 08-03-2017
Publisher: AIP
Date: 2009
DOI: 10.1063/1.3293803
Publisher: IOP Publishing
Date: 08-09-2020
Publisher: American Physical Society (APS)
Date: 28-08-2014
Publisher: American Physical Society (APS)
Date: 09-05-2003
Publisher: American Physical Society (APS)
Date: 04-03-2011
Publisher: Elsevier BV
Date: 10-2003
Publisher: American Physical Society (APS)
Date: 08-10-1998
Publisher: Fermi National Accelerator Laboratory (FNAL), Batavia, IL
Date: 2004
DOI: 10.2172/879071
Publisher: AIP
Date: 2007
DOI: 10.1063/1.2735181
Location: United States of America
Location: United States of America
Start Date: 07-2022
End Date: 06-2025
Amount: $432,195.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2010
End Date: 12-2014
Amount: $180,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2019
End Date: 2020
Amount: $450,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2009
End Date: 12-2011
Amount: $620,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 08-2020
End Date: 08-2027
Amount: $35,000,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 06-2017
End Date: 12-2020
Amount: $237,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2011
End Date: 12-2018
Amount: $25,200,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 12-2012
End Date: 11-2018
Amount: $556,928.00
Funder: Australian Research Council
View Funded Activity