... Broad Absorption Line Quasi-stellar Objects Braun, Erez ; Milgrom, Mordehai Abstract A simple, non-steady state mechanism for ...
Tópico(s): Spectroscopy and Laser Applications
1989 - IOP Publishing | The Astrophysical Journal
... and the Distribution of Their Mean Surface-Brightness Milgrom, Mordehai Abstract I begin an examination of the stability ...
Tópico(s): Geophysics and Gravity Measurements
1989 - IOP Publishing | The Astrophysical Journal
... A Particularly Acute Test of the Modified Dynamics Milgrom, Mordehai ; Braun, Erez Abstract We compare the rotation curve ...
Tópico(s): Geophysics and Gravity Measurements
1988 - IOP Publishing | The Astrophysical Journal
... Galaxy Rotation Curves to Test the Modified Dynamics Milgrom, Mordehai Abstract I expound various aspects of the testing ...
Tópico(s): Geophysics and Gravity Measurements
1988 - IOP Publishing | The Astrophysical Journal
... to the Conclusions of Lo, Sargent, and Young Milgrom, Mordehai Abstract Lo, Sargent, & Young (1993) have recently published ...
Tópico(s): Galaxies: Formation, Evolution, Phenomena
1994 - IOP Publishing | The Astrophysical Journal
... Analysis of the Rotation Curves of Dwarf Spirals Milgrom, Mordehai Abstract Lake (1989) analyzes the rotation curves of ...
Tópico(s): Stellar, planetary, and galactic studies
1991 - IOP Publishing | The Astrophysical Journal
Mordehai Milgrom, David Pines,
view Abstract Citations (61) References (34) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Cygnus X-3: A cocooned X-ray binary pulsar? Milgrom, M. ; Pines, D. Abstract It is shown that observations of both the hard X-ray and gamma-ray spectrum and the gamma-ray light curves of Cyg X-3 find a natural explanation in a model for the system of a fast binary pulsar (with a period between 10 and 30 ms) surrounded by a cocoon (of scattering optical depth unity) located about ...
Tópico(s): High-pressure geophysics and materials
1978 - IOP Publishing | The Astrophysical Journal
John N. Bahcall, Mordehai Milgrom,
view Abstract Citations (15) References (34) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The magnetic dipole model for superluminal radio sources Bahcall, J. N. ; Milgrom, M. Abstract The magnetic dipole model (MAD) for superluminal radio sources is described in detail. Analytic derivations are presented for a number of observationally accessible kinematic quantities, as well as for the size and shape of the radio lobes and the probability distributions for the velocities. ...
Tópico(s): Particle Accelerators and Free-Electron Lasers
1980 - IOP Publishing | The Astrophysical Journal
view Abstract Citations (2400) References (10) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A modification of the Newtonian dynamics as a possible alternative to the hidden mass hypothesis. Milgrom, M. Abstract The author considers the possibility that there is not, in fact, much hidden mass in galaxies and galaxy systems. If a certain modified version of the Newtonian dynamics is used to describe the motion of bodies in a gravitational field (of a galaxy, say), ...
Tópico(s): Relativity and Gravitational Theory
1983 - IOP Publishing | The Astrophysical Journal
view Abstract Citations (852) References (59) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A modification of the Newtonian dynamics - Implications for galaxies. Milgrom, M. Abstract A form of the Newtonian dynamics which has been modified with respect to inertia and/or gravity is used to describe the motion of bodies in the gravitational fields of galaxies, under the assumption that galaxies contain no hidden mass. Among the consequences of this method which are presently ...
Tópico(s): Scientific Research and Discoveries
1983 - IOP Publishing | The Astrophysical Journal
view Abstract Citations (106) References (24) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Isothermal spheres in the modified dynamics Milgrom, M. Abstract Dynamics which differ from the Newtonian in the limit of small accelerations are used in the present consideration of self-gravitating isotropic and anisotropic isothermal spheres (IS), which serve as reference models for such astrophysical objects as globular and open clusters, galactic bulges, and clusters of ...
Tópico(s): Astro and Planetary Science
1984 - IOP Publishing | The Astrophysical Journal
Jacob D. Bekenstein, Mordehai Milgrom,
view Abstract Citations (770) References (12) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Does the missing mass problem signal the breakdown of Newtonian gravity? Bekenstein, J. ; Milgrom, M. Abstract A nonrelativistic potential theory for gravity is considered which differs from the Newtonian theory. The theory is built on the basic assumptions of the modified dynamics, which were shown earlier to reproduce dynamical properties of galaxies and galaxy aggregates ...
Tópico(s): Geophysics and Gravity Measurements
1984 - IOP Publishing | The Astrophysical Journal
view Abstract Citations (50) References (13) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Can the Hidden Mass Be Negative? Milgrom, M. Abstract A consequence of modified nonrelativistic dynamics (MOND) which is incompatible with the hidden mass hypothesis (HMH) is discussed. If MOND is basically correct, there are mass configurations which, when probed dynamically using Newtonian dynamics will appear to contain negative 'hidden mass', so that the deduced mass density ...
Tópico(s): Solar and Space Plasma Dynamics
1986 - IOP Publishing | The Astrophysical Journal
view Abstract Citations (147) References (6) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Solutions for the Modified Newtonian Dynamics Field Equation Milgrom, M. Abstract General properties of the solutions of the modified Newtonian dynamics field equations suggested by Bekenstein and Milgrom (1984) are described along with a numerical scheme for solving this equation for axisymmetric mass configurations, and numerical results are presented. It is demonstrated that ...
Tópico(s): Stellar, planetary, and galactic studies
1986 - IOP Publishing | The Astrophysical Journal
Mordehai Milgrom, S. Shtrikman,
The response coefficients of a polycrystal, made of domains of a uniaxial crystal, to n coupled fields---such as in the thermoelectric or magnetoelectric effects---are not all independent. Only 6n constants are needed to determine all the 3n(3n+1)/2 measurable constants of any such a polycrystal---given the constants of the single crystal. The constraints on ${L}_{(\ensuremath{\alpha}\ensuremath{\beta})}^{\mathrm{*}}$---the response matrix of the polycrystal, for the space coordinate \ensuremath{\alpha},\ ...
Tópico(s): Thermal properties of materials
1989 - American Physical Society | Physical review. B, Condensed matter
Mordehai Milgrom, S. Shtrikman,
A family of models for multicomponent, isotropic mixtures is suggested and discussed for which the exact values of the effective, linear-response constants can be calculated: The basic unit of the model is a hollow system of contacting concentric shells, each of which is made of one of the components. Space is packed with such units of different sizes, but the same proportions; the cavity within each such shell system is then packed with similar systems, and this continues in an infinite nesting ...
Tópico(s): Acoustic Wave Phenomena Research
1989 - American Institute of Physics | Journal of Applied Physics
Mordehai Milgrom, S. Shtrikman,
We consider the linear-response properties of composites made of two isotropic materials. We concentrate on linear-response phenomena, with nonvanishing cross coefficients, such as the magnetoelectric effect, the thermoelectric effect, and coupled, multispecies diffusion. We find that the moduli of the composite must obey a number of compatibility relations, involving the moduli of the components, but totally independent of the mixture ratio of the components and the microstructure of the composite. ...
Tópico(s): Numerical methods in engineering
1989 - American Institute of Physics | Physical review. A, General physics
I pinpoint a previously unrecognized MOND effect that may act in the inner solar system, and is due to the galactic acceleration, g_g=eta*a0: a byproduct of the MOND external-field effect. Predictions of the effect are not generic to the MOND paradigm, but depend on the particular MOND formulation at hand. However, the modified-Poisson formulation, on which I concentrate, uniquely predicts a subtle anomaly that may be detected in planetary and spacecraft motions (and perhaps in other precision systems, ...
Tópico(s): Solar and Space Plasma Dynamics
2009 - Oxford University Press | Monthly Notices of the Royal Astronomical Society
The MOND limit is shown to follow from a requirement of space-time scale invariance of the equations of motion for nonrelativistic, purely gravitational systems; i.e., invariance of the equations of motion under (t, r) → (λt, λr) in the limit a 0 → ∞ .It is suggested that this should replace the definition of the MOND limit based on the low-acceleration behavior of a Newtonian-MOND interpolating function.In this way, the salient, deep-MOND results-asymptotically flat rotation curves, the mass-rotational- ...
Tópico(s): Relativity and Gravitational Theory
2009 - IOP Publishing | The Astrophysical Journal
Prompted by the recent claim, by Donato et al., of a quasi-universal central surface density of galaxy dark matter halos, I look at what MOND has to say on the subject. MOND, indeed, predicts a quasi-universal value of this quantity for objects of all masses and of any internal structure, provided they are mostly in the Newtonian regime; i.e., that their mean acceleration is at or above a0. The predicted value is qSm, with Sm= a0/2 pi G= 138 solar masses per square parsec for the nominal value of ...
Tópico(s): Cosmology and Gravitation Theories
2009 - Oxford University Press | Monthly Notices of the Royal Astronomical Society
A new relativistic formulation of MOND is advanced, involving two metrics as independent degrees of freedom: the MOND metric g_mn, to which alone matter couples, and an auxiliary metric g*_mn. The main idea hinges on the fact that we can form tensors from the difference, C^a_bc, of the Levi-Civita connections of the two metrics, and these act like gravitational accelerations. In the context of MOND we can form dimensionless `acceleration' scalars, and functions thereof, from contractions of C^a_bc/ ...
Tópico(s): Relativity and Gravitational Theory
2009 - American Physical Society | Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology
Mordehai Milgrom, S. Shtrikman,
We discuss the energy of an inclusion—a configuration whereby a "polarization" distribution is dictated in a bounded domain, D of a medium with linear-response properties. Such is the case when a stress-free strain is prescribed in a domain of an elastic medium, or when a magnet is introduced into a paramagnetic medium. First we treat elastic inclusions. We find that when an eigenstrain ϵ∗ij is dictated within D the energy cannot exceed W0=(12)∫Dε∗ij(r)Cijkl(r)ε∗kl(r)d3r Cijkl being the elastic tensor ...
Tópico(s): Thermoelastic and Magnetoelastic Phenomena
1992 - Elsevier BV | Journal of the Mechanics and Physics of Solids
I estimate MOND M/L values for nine galaxy groups that were recently studied by Tully et al.. Instead of the large M/L values that they find with Newtonian dynamics (up to 1200 solar units) the MOND estimates cluster around 1 solar unit. Tully et al. find a systematic and significant difference between the M/L values of groups that do not contain luminous galaxies and those that do: Dwarfs-only groups have larger M/L values (by a factor of about 5). The MOND M/L values do not show this trend; the ...
Tópico(s): Astronomy and Astrophysical Research
2002 - IOP Publishing | The Astrophysical Journal
In a recent paper, Kaplinghat and Turner (2001) (KT) advertise that MOND can be derived naturally in the CDM paradigm. They actually proceed to produce a more limited result: Every galaxy should have a transition radius, $r_t$, below which baryons dominate, and above which dark matter (DM) takes over; the acceleration at $r_t$ is nearly the same for all galaxies; and due to a coincidences this is of order $a_0\sim cH_0$. This follows from their tacit, intermediate result, whereby CDM halos of galaxies ...
Tópico(s): Dark Matter and Cosmic Phenomena
2002 - IOP Publishing | The Astrophysical Journal
Tópico(s): Dark Matter and Cosmic Phenomena
2002 - Springer Nature | Scientific American
I discuss open theoretical questions pertaining to the modified dynamics (MOND)—a proposed alternative to dark matter, which posits a breakdown of Newtonian dynamics in the limit of small accelerations. In particular, I point the reasons for thinking that MOND is an effective theory—perhaps, despite appearance, not even in conflict with GR. I then contrast the two interpretations of MOND as modified gravity and as modified inertia. I describe two mechanical models that are described by potential ...
Tópico(s): Scientific Research and Discoveries
2002 - Elsevier BV | New Astronomy Reviews
Mordehai Milgrom, R. H. Sanders,
The recent findings of Romanowsky et al., of an ``unexpectedly'' small mass discrepancy within 5 effective radii in several elliptical galaxies, are not surprising in the context of MOND. As we show here, they are, in fact, in full concordance with its predictions. One is dealing with high-surface-density galaxies with mean accelerations rather larger than the acceleration constant of MOND. These findings continue, and are now the extreme examples of, the trend predicted by MOND: the mass discrepancy ...
Tópico(s): Astrophysical Phenomena and Observations
2003 - IOP Publishing | The Astrophysical Journal
I start with a brief introduction to MOND phenomenology and its possible roots in cosmology—a notion that may turn out to be the most far reaching aspect of MOND. Next I discuss the implications of MOND for the dark matter (DM) doctrine: MOND’s successes imply that baryons determine everything. For DM this would mean that the puny tail of leftover baryons in galaxies wags the hefty DM dog. This has to occur in many intricate ways, and despite the haphazard construction history of galaxies—a very ...
Tópico(s): Dark Matter and Cosmic Phenomena
2008 - Elsevier BV | New Astronomy Reviews
Mordehai Milgrom, R. H. Sanders,
MOND predicts that a mass, M, contained within its transition radius r_t=(MG/a0)^{1/2}, may exhibit a feature at about that radius in the form of a shell, or projected ring, in the deduced distribution of its phantom dark matter. This occurs despite the absence of any underlying feature in the true (``baryon'') source distribution itself. The phenomenon is similar to the appearance of an event horizon and other unusual physics ``in the middle of nothing'' near the transition radius of General Relativity $ ...
Tópico(s): Dark Matter and Cosmic Phenomena
2008 - IOP Publishing | The Astrophysical Journal
I look at the growth of weak density inhomogeneities of nonrelativistic matter, in bimetric-MOND (BIMOND) cosmology. I concentrate on matter-twin-matter-symmetric versions of BIMOND, and assume that, on average, the universe is symmetrically populated in the two sectors. MOND effects are absent in an exactly symmetric universe, apart from the appearance of a cosmological constant, Lambda~(a0/c)^2. MOND effects-local and cosmological-do enter when density inhomogeneities that differ in the two sectors ...
Tópico(s): Dark Matter and Cosmic Phenomena
2010 - American Physical Society | Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology