Publications (122)
Direct detection of mirror helium dark matter in the CRESST-III experiment
R. Foot
Within the context of mirror dark matter, the dominant mass component of the Milky Way dark halo consists of mirror helium ions. Mirror helium can interact with ordinary matter if…
Can dark matter - electron scattering explain the DAMA annual modulation consistent with XENON100 constraints?
R. Foot
For many years annually modulating keV scintillations have been observed in the DAMA/NaI and DAMA/Libra experiments. A dark matter - electron scattering interpretation is no…
Experimental signatures of a massive mirror photon
R. Foot
There has been some speculation about the possible existence of a second photon which only couples to ordinary matter through mixing of the gauge kinetic terms. If the exotic photo…
Can dark matter - electron scattering explain the DAMA annual modulation signal?
R. Foot
The annually modulating keV scintillations observed in the DAMA/NaI and DAMA/Libra experiments might be due to dark matter - electron scattering. Such an explanation is now…
Up-down atmospheric neutrino flux asymmetry predictions for various neutrino oscillation scenarios
R. Foot, R. R. Volkas, O. Yasuda
We compute up-down asymmetries for atmospheric neutrino induced electron and muon events in the SuperKamiokande detector for the following neutrino oscillation models: (A) maximall…
Testing maximal electron and muon neutrino oscillations with sub-GeV SuperKamiokande atmospheric neutrino data
R. Foot, R. R. Volkas, O. Yasuda
Motivated by the Exact Parity Model and other theories, the hypothesis that each of the known neutrinos oscillates maximally with a sterile partner has been put forward as an expla…
Dissipative dark matter halos: The steady state solution II
R. Foot
Within the mirror dark matter model and dissipative dark matter models in general, halos around galaxies with active star formation (including spirals and gas rich dwarfs) are dyna…
Dissipative dark matter explains rotation curves
R. Foot
Dissipative dark matter, where dark matter particles interact with a massless (or very light) boson, is studied. Such dark matter can arise in simple hidden sector gauge models, in…
Do magnetic fields prevent mirror particles from entering the galactic disk?
R. Foot
Recently it has been suggested that magnetic fields prevent mirror particles from entering the galactic disk, thereby disfavoring the mirror dark matter explanation of the dark mat…
Implications of mirror dark matter kinetic mixing for CMB anisotropies
R. Foot
Mirror dark matter is a dissipative and self-interacting multiparticle dark matter candidate which can explain the DAMA, CoGeNT and CRESST-II direct detection experiments. This exp…
Solutions of the atmospheric, solar and LSND neutrino anomalies from TeV scale quark-lepton unification
T. L. Yoon, R. Foot
There is a unique gauge model which allows quarks and leptons to be unified at the TeV scale. It is already known that the neutrino masses a…
Thin disk of co-rotating dwarfs: a fingerprint of dissipative (mirror) dark matter?
R. Foot, Z. K. Silagadze
Recent observations indicate that about half of the dwarf satellite galaxies around M31 orbit in a thin plane approximately aligned with the Milky Way. It has been argued that this…
Maximal oscillations, the see-saw mechanism and the Exact Parity Model
T. L. Yoon, R. Foot
We examine one simple mechanism which leads to approximate maximal oscillations in the standard see-saw model. In particular, we show that this scheme could be imple…
Active-Sterile neutrino oscillations and BBN+CMBR constraints
P. Di Bari, R. Foot
We show how active-sterile neutrino oscillations in the early Universe can play an interesting role in explaining the current observations of CMBR anisotropies and light element ab…
Direct detection experiments explained with mirror dark matter
R. Foot
Recently, the CDMS/Si experiment has observed a low energy excess of events in their dark matter search. In light of this new result we update the mirror dark matter explanation of…
Cosmological implications of low scale quark-lepton unification
T. L. Yoon, R. Foot
There is a unique gauge model which allows quarks and leptons to be unified at the TeV scale -- thereby making the model…
Maximal oscillations, Borexino and smoking guns
R. Foot
We examine the maximal and oscillation solutions to the solar neutrino problem. These solutions lead to roughly a 50% solar flux reduction for t…
Diurnal modulation due to self-interacting mirror and hidden sector dark matter
R. Foot
Mirror and more generic hidden sector dark matter models can simultaneously explain the DAMA, CoGeNT and CRESST dark matter signals consistently with the null results of the other…
Quaternionic Formulation of the Exact Parity Model
S. P. Brumby, R. Foot, R. R. Volkas
The exact parity model (EPM) is a simple extension of the Standard Model which reinstates parity invariance as an unbroken symmetry of nature. The mirror matter sector of the model…
Dissipative dark matter halos: The steady state solution
R. Foot
Dissipative dark matter, where dark matter particle properties closely resemble familiar baryonic matter, is considered. Mirror dark matter, which arises from an isomorphic hidden…
Avoiding the gauge heirarchy problem with see-sawed neutrino masses
R. Foot
We show that the see-saw neutrino mass mechanism can coexist naturally with an extended gauge symmetry (i.e. without any gauge heirarchy problem) provided that the gauge symmetry c…
Testing the mirror world hypothesis for the close-in extrasolar planets
R. Foot
Because planets are not expected to be able to form close to stars due to the high temperatures, it has been suggested that the observed close orbiting ( AU) large mass…
Are four neutrino models ruled out?
R. Foot
We show explicitly that four neutrino models of the 2+2 variety still provide an acceptable global fit to the solar, atmospheric and LSND neutrino data. The goodness of fit, define…
Explaining through the synthesis of ordinary matter from mirror matter: a more general analysis
R. Foot, R. R. Volkas
The emerging cosmological picture is of a spatially flat universe composed predominantly of three components: ordinary baryons (), non-baryonic dark matter ($Ω_…
Do mirror planets exist in our solar system?
R. Foot, Z. K. Silagadze
Mirror matter is predicted to exist if parity is an unbroken symmetry of nature. Currently, there is a large amount of evidence that mirror matter actually exists coming from astro…
Hidden sector dark matter explains the DAMA, CoGeNT, CRESST-II and CDMS/Si experiments
R. Foot
We examine data from the DAMA, CoGeNT, CRESST-II and CDMS/Si direct detection experiments in the context of multi-component hidden sector dark matter. The models considered feature…
XENON1T implications for the DAMA annual modulation: The good, the bad and the ugly
R. Foot
Previous work has argued that the DAMA annual modulation signal might be due to electron recoils in plasma dark matter models. A specific model assuming mirror dark matter and feat…
Evidence for mirror dark matter from the CDMS low energy electron recoil spectrum
R. Foot
We point out that mirror dark matter predicts low energy ( keV) electron recoils from mirror electron scattering as well as nuclear recoils from mirror io…
Do "isolated" planetary mass objects orbit mirror stars?
R. Foot, A. Yu. Ignatiev, R. R. Volkas
We propose that the ``isolated'' planetary mass objects observed by Zapatero Osorio et al in the Orionis cluster might actually be in orbit around invisible stellar mass compa…
A mirror world explanation for the Pioneer spacecraft anomalies?
R. Foot, R. R. Volkas
We show that the anomalous acceleration of the Pioneer 10/11 spacecraft can be explained if there is some mirror gas or mirror dust in our solar system.
Implications of mirror neutrinos for early universe cosmology
R. Foot, R. R. Volkas
The Exact Parity Model (EPM) is, in part, a theory of neutrino mass and mixing that can solve the atmospheric, solar and LSND anomalies. The central feature of the neutrino sector…
Spheroidal galactic halos and mirror dark matter
R. Foot, R. R. Volkas
Mirror matter has been proposed as a dark matter candidate. It has several very attractive features, including automatic stability and darkness, the ability to mimic the broad feat…
A comprehensive analysis of the dark matter direct detection experiments in the mirror dark matter framework
R. Foot
Mirror dark matter offers a framework to explain the existing dark matter direct detection experiments. Here we confront this theory with the most recent experimental data, paying…
Studies of neutrino asymmetries generated by ordinary-sterile neutrino oscillations in the early universe and implications for big bang nucleosynthesis bounds
R. Foot, R. R. Volkas
Ordinary-sterile neutrino oscillations can generate a significant lepton number asymmetry in the early Universe. We study this phenomenon in detail. We show that the dynamics of or…
Are mirror planets opaque?
R. Foot
Over the last few years, many close orbiting ( A.U.) large mass planets () of nearby stars have been discovered. Their existence has been inferred from tiny…
Electric Charge Quantization
R. Foot, H. Lew, R. R. Volkas
Experimentally it has been known for a long time that the electric charges of the observed particles appear to be quantized. An approach to understanding electric charge quantizati…
Galactic structure explained with dissipative mirror dark matter
R. Foot
Dissipative dark matter, such as mirror dark matter and related hidden sector dark matter candidates, requires an energy source to stabilize dark matter halos in spiral galaxies. I…
Detecting dark matter using centrifuging techniques
S. Mitra, R. Foot
A new and inexpensive technique for detecting self interacting dark matter in the form of small grains in bulk matter is proposed. Depending on the interactions with ordinary matte…
Explicit Electroweak symmetry breaking?
R. Foot, Tran Anh Tuan
We hypothesise that all electroweak symmetry breaking terms such as fermion masses and the W and Z gauge boson masses arise radiatively from just one explicit symmetry breaking ter…
The mirror world interpretation of the 1908 Tunguska event and other more recent events
R. Foot
Mirror matter is predicted to exist if parity (i.e. left-right symmetry) is a symmetry of nature. Remarkably mirror matter is capable of simply explaining a large number of contemp…
Some comments on Super-Kamiokande's multi-ring analysis
R. Foot
The super-Kamiokande collaboration have used multi-ring events to discriminate between the and solutions to the atmospheric neutrino anomaly. We sh…
The neutrino puzzle in the light of SNO
R. Foot, R. R. Volkas
SNO's neutral current measurement has added a new piece to the emerging neutrino physics puzzle. Putting together the presently available experimental information, an essentially u…
The exact parity symmetric model and big bang nucleosynthesis
R. Foot, R. R. Volkas
The assumption of exact, unbroken parity symmetry leads directly to a simple predictive resolution of the atmospheric and solar neutrino puzzles. This is because the existence of t…
Exploring the mirror matter interpretation of the DAMA experiment: Has the dark matter problem been solved?
R. Foot
The self consistency between the impressive DAMA annual modulation signal and the differential energy spectrum is an important test for dark matter candidates.Mirror matter-type da…
Model for a Light Z' Boson
R. Foot, X. -G. He, H. Lew +1
A model of a light boson is constructed and phenomenological bounds are derived. This boson arises from a very simple extension to the Standard Model, and it is constrain…
Neutrino oscillations and the exact parity model
R. Foot
We re-examine neutrino oscillations in exact parity models. Previously it was shown in a specific model that large neutrino mixing angles result. We show here that this is a genera…
Mirror dark matter: Cosmology, galaxy structure and direct detection
R. Foot
A simple way to accommodate dark matter is to postulate the existence of a hidden sector. That is, a set of new particles and forces interacting with the known particles predominan…
Atmospheric Neutrino Tests of Neutrino Oscillation Mechanisms
R. Foot, C. N. Leung, O. Yasuda
Recent Super-Kamiokande data on the atmospheric neutrino anomaly are used to test various mechanisms for neutrino oscillations. It is found that the current atmospheric neutrino da…
A novel left-right symmetric model
R. Foot, H. Lew
A novel gauge model which has a spontaneously broken parity symmetry is constructed. The model has only 2 parameters beyond those of the standard model. Some of the unusual implica…
Resolution of the small scale structure issues with dissipative dark matter from multiple Standard Model sectors
R. Foot
Dissipative dark matter arising from a hidden sector consisting of exact copies of the Standard Model is discussed. The particles from each sector interact with those…
A CoGeNT confirmation of the DAMA signal
R. Foot
The CoGeNT collaboration has recently reported a rising low energy spectrum in their ultra low noise germanium detector. This is particularly interesting as the energy range probed…
A dark matter scaling relation from mirror dark matter
R. Foot
Mirror dark matter, and other similar dissipative dark matter candidates, need an energy source to stabilize dark matter halos in spiral galaxies. It has been suggested previously…
Reconciling sterile neutrinos with big bang nucleosynthesis
R. Foot, R. R. Volkas
We re-examine the big bang nucleosynthesis (BBN) bounds on the mixing of neutrinos with sterile species. These bounds depend on the assumption that the relic neutrino asymmetry $L_…
DAMA annual modulation from electron recoils
R. Foot
Plasma dark matter, which arises in dissipative dark matter models, can give rise to large annual modulation signals from keV electron recoils. Previous work has argued that the DA…
An alternative SU(4) x SU(2)L x SU(2)R model
R. Foot
A simple alternative to the usual Pati-Salam model is proposed. The model allows quarks and leptons to be unified with gauge group at a rema…
Comparing and contrasting the and solutions to the atmospheric neutrino problem with SuperKamiokande data
R. Foot, R. R. Volkas, O. Yasuda
The and solutions to the atmospheric neutrino problem are compared with SuperKamiokande data. The differences between these solutions due to matt…
A simple explanation of the PVLAS anomaly in spontaneously broken mirror models
R. Foot, A. Kobakhidze
The PVLAS anomaly can be explained if there exist millicharged particles of mass eV and electric charge . We point out that such particle…
Implications of TeV scale SU(4)xSU(2)_LxSU(2)_R quark-lepton unification
R. Foot, G. Filewood
The alternative gauge model, which allows unification of the quarks and leptons at the TeV scale, is studied in detail. We discuss the impli…
New and improved quark-lepton symmetric models
R. Foot, R. R. Volkas
We show how the use of a see-saw mechanism based on a neutrino mass matrix texture can considerably simplify Higgs sectors for quark-lepton symmetric models (and for S…
Leptons masses in an Gauge Model
R. Foot, O. F. Hernandez, F. Pisano +1
The model of Pisano and Pleitez extends the Standard Model in a particularly nice way, so that for example the anomalies cancel only when the…
Have mirror planets been observed?
R. Foot
Over the last few years, several close orbiting ( AU) large mass planets () of nearby stars have been discovered. Their existence has been inferred f…
Supernova explosions, 511 keV photons, gamma ray bursts and mirror matter
R. Foot, Z. K. Silagadze
There are three astroparticle physics puzzles which fire the imagination: the origin of the ``Great Positron Producer'' in the galactic bulge, the nature of the gamma-ray bursts ce…
Neutrino masses in the SU(5)xSU(5)' mirror symmetric model
M. Collie, R. Foot
Motivated by the atmospheric and solar neutrino anomalies, we study neutrino masses in a parity invariant SU(5)xSU(5)' grand unified model. Constraints from photon-mirror photon ki…
Mirror matter in the solar system: New evidence for mirror matter from Eros
R. Foot, S. Mitra
Mirror matter is an entirely new form of matter predicted to exist if mirror symmetry is a fundamental symmetry of nature. Mirror matter has the right broad properties to explain t…
Mirror dark matter
R. Foot
A mirror sector of particles and forces provides a simple explanation of the inferred dark matter of the Universe. The status of this theory is reviewed - with emphasis on how the…
A Next-Generation Liquid Xenon Observatory for Dark Matter and Neutrino Physics
J. Aalbers, K. Abe, V. Aerne +591
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 leadi…
Mirror dark matter explanation of the DAMA, CoGeNT and CRESST-II data
R. Foot
Dark matter might reside in a hidden sector which contains an unbroken gauge interaction kinetically mixed with standard . Mirror dark matter provides a well motiva…
On the sign of the neutrino asymmetry induced by active-sterile neutrino oscillations in the early Universe
P. Di Bari, R. Foot
We deal with the problem of the final sign of the neutrino asymmetry generated by active-sterile neutrino oscillations in the Early Universe solving the full momentum dependent qua…
Natural electroweak symmetry breaking in generalised mirror matter models
R. Foot, R. R. Volkas
It has recently been pointed out that the mirror or twin Higgs model is more technically natural than the standard model, thus alleviating the ``little'' hierarchy problem. In this…
Dissipative hidden sector dark matter
R. Foot, S. Vagnozzi
A simple way of explaining dark matter without modifying known Standard Model physics is to require the existence of a hidden (dark) sector, which interacts with the visible one pr…
Shielding of a direct detection experiment and implications for the DAMA annual modulation signal
R. Foot
Previous work has argued that, in the framework of plasma dark matter models, the DAMA annual modulation signal can be consistently explained with electron recoils. In the specific…
Top quark forward-backward asymmetry from SU(N_c) color
R. Foot
We argue that the production asymmetry observed at the tevatron might be simply explained if the standard QCD theory is extended to which is spontane…
Detailed study of BBN implications of neutrino oscillation generated neutrino asymmetries in some four neutrino models
R. Foot
We re-examine the evolution of neutrino asymmetries in several four neutrino models. The first case involves the direct creation of by oscill…
Neutrino physics and the mirror world: how exact parity symmetry explains the solar neutrino deficit, the atmospheric neutrino anomaly and the LSND experiment
R. Foot, R. R. Volkas
Evidence for oscillations has been reported at LAMPF using the LSND detector. Further evidence for neutrino mixing comes from the solar neutrino…
Ordinary atom-mirror atom bound states: A new window on the mirror world
R. Foot, S. Mitra
Mirror symmetry is a plausible candidate for a fundamental symmetry of particle interactions which can be exactly conserved if a set of mirror particles exist. The properties of th…
Exotic meteoritic phenomena: The Tunguska event and anomalous low altitude fireballs -- manifestations of the mirror world?
R. Foot, T. L. Yoon
There are a number of very puzzling meteoritic events including (a) The Tunguska event. It is the only known example of a low altitude atmospheric explosion. It is also the largest…
Reconciling the positive DAMA annual modulation signal with the negative results of the CDMS II experiment
R. Foot
We examine the recent CDMS II results in the context of the mirror matter interpretation of the DAMA/NaI experiment.We find that the favoured mirror matter interpretation of the DA…
Have mirror micrometeorites been detected?
R. Foot, S. Mitra
Slow-moving ( km/s) 'dark matter particles' have allegedly been discovered in a recent experiment. We explore the possibility that these slow moving dark matter particle…
Mirror matter-type dark matter
R. Foot
There are six main things which any non-baryonic dark matter theory should endeavour to explain: (1) The basic dark matter particle properties [mass, stability, darkness]; (2) The…
How neutrino oscillations can induce an effective neutrino number of less than 3 during Big Bang Nucleosynthesis
R. Foot, R. R. Volkas
Ordinary-sterile neutrino oscillations can generate significant neutrino asymmetry in the early Universe. In this paper we extend this work by computing the evolution of neutrino a…
Mirror dark matter and the new DAMA/LIBRA results: A simple explanation for a beautiful experiment
R. Foot
Recently, the DAMA/LIBRA experiment has convincingly confirmed the DAMA/NaI annual modulation signal, experimentally demonstrating the existence of non-baryonic dark matter in the…
Maximal neutrino oscillation solution to the solar neutrino problem
R. Foot, R. R. Volkas
We discuss a simple predictive solution to the solar neutrino problem based on maximal vacuum neutrino oscillations. The solution can be motivated by the exact parity symmetric mod…
Relic neutrino asymmetries and big bang nucleosynthesis in a four neutrino model
N. F. Bell, R. Foot, R. R. Volkas
Oscillations between ordinary and sterile neutrinos can generate large neutrino asymmetries in the early universe. These asymmetries can significantly affect big bang nucleosynthes…
Effects for atmospheric neutrino experiments from electron neutrino oscillations
J. Bunn, R. Foot, R. R. Volkas
The minimal interpretation of the atmospheric neutrino data suggests that the muon neutrino oscillates into another species with a mixing angle close to the maximal . In the…
Relevance of the CDMSII events for mirror dark matter
R. Foot
Mirror dark matter offers a framework to explain the existing dark matter direct detection experiments, including the impressive DAMA annual modulation signal. Here we examine the…
Mirror and hidden sector dark matter in the light of new CoGeNT data
R. Foot
The CoGeNT collaboration has recently made available new data collected over a period of 15 months. In addition to more accurately measuring the spectrum of nuclear recoil candidat…
Plasma dark matter and electronic recoil events in XENON1T
Lei Zu, R. Foot, Yi-Zhong Fan +1
Dark matter might be in the form of a dark plasma in the Milky Way halo. Specifically, we consider here a hidden sector consisting of a light `dark electron' and a much heavier `da…
Generalised leptonic colour
R. Foot, R. R. Volkas
It is conceivable that there is an `colour' gauge group for leptons, analogous to the gauged colour group of the quarks. The standard model emerges as the…
A note on Koide's lepton mass relation
R. Foot
Koide has pointed out that the mass relation is consistent with the most recent measurements of the tau…
Dissipative dark matter and the rotation curves of dwarf galaxies
R. Foot
There is ample evidence from rotation curves that dark matter halos around disk galaxies have nontrivial dynamics. Of particular significance are: a) the cored dark matter profile…
Implications of the solution to the atmospheric neutrino anomaly for early Universe cosmology
R. Foot
By numerically solving the quantum kinetic equations we compute the range of parameters where the oscillation solution to the atmospheric neutrino anomaly is consis…
Is the oscillation solution to the atmospheric neutrino anomaly excluded by the superKamiokande data?
R. Foot
Recently the SuperKamiokande collaboration have claimed that their data exclude the solution to the atmospheric neutrino anomaly at more than 99% C.L. We critically…
Diurnal modulation signal from dissipative hidden sector dark matter
R. Foot, S. Vagnozzi
We consider a simple generic dissipative dark matter model: a hidden sector featuring two dark matter particles charged under an unbroken interaction. Previous work has sho…
Unbroken versus broken mirror world: a tale of two vacua
R. Foot, H. Lew, R. R. Volkas
If the Lagrangian of nature respects parity invariance then there are two distinct possibilities: either parity is unbroken by the vacuum or it is spontaneously broken. We examine…
Differentiating hidden sector dark matter from light WIMPs with Germanium detectors
R. Foot
Light WIMP dark matter and hidden sector dark matter have been proposed to explain the DAMA, CoGeNT and CRESST-II data. Both of these approaches feature spin independent elastic sc…
Quark-Lepton Symmetry
R. Foot, H. Lew, R. R. Volkas
Quark-lepton symmetric models are a class of gauge theories motivated by the similarities between the quarks and leptons. In these models the gauge group of the standard model is e…
Do the SuperKamiokande atmospheric neutrino results explain electric charge quantisation?
R. Foot, R. R. Volkas
We show that the SuperKamiokande atmospheric neutrino results explain electric charge quantisation, provided that the oscillation mode is and that the neutrino ma…
Comment on ``Neutrino oscillations in the early universe: how can large lepton asymmetry be generated?"
P. Di Bari, R. Foot, R. R. Volkas +1
We comment on the recent paper by A. D. Dolgov, S. H. Hansen, S. Pastor and D. V. Semikoz (DHPS) [Astropart. Phys. {\bf 14}, 79 (2000)] on the generation of neutrino asymmetries fr…
Tully-Fisher relation, galactic rotation curves and dissipative mirror dark matter
R. Foot
If dark matter is dissipative then the distribution of dark matter within galactic halos can be governed by dissipation, heating and hydrostatic equilibrium. Previous work has show…
Can the mirror world explain the ortho-positronium lifetime puzzle?
R. Foot, S. N. Gninenko
We suggest that the discrepant lifetime measurements of ortho-positronium can be explained by ortho-positronium oscillations into mirror ortho-positronium. This explanation can be…