%% Books @book{fds4094, Author = {M.E.J. Newman and R.G. Palmer}, Title = {Modeling Extinction}, Publisher = {Oxford University Press}, Year = {2003}, Month = {Spring}, Key = {fds4094} } %% Papers Published @article{fds247649, Author = {Dragoi, V and Staddon, JER and Palmer, RG and Buhusi, CV}, Title = {Interval Timing as an Emergent Learning Property}, Journal = {Psychological Review}, Volume = {110}, Number = {1}, Pages = {126-144}, Year = {2003}, url = {http://dx.doi.org/10.1037//0033-295X.110.1.126}, Abstract = {Interval timing in operant conditioning is the learned covariation of a temporal dependent measure such as wait time with a temporal independent variable such as fixed-interval duration. The dominant theories of interval timing all incorporate an explicit internal clock, or "pacemaker," despite its lack of independent evidence. The authors propose an alternative, pacemaker-free view that demonstrates that temporal discrimination can be explained by using only 2 assumptions: (a) variation and selection of responses through competition between reinforced behavior and all other, elicited, behaviors and (b) modulation of the strength of response competition by the memory for recent reinforcement. The model departs radically from existing timing models: It shows that temporal learning can emerge from a simple dynamic process that lacks a periodic time reference such as a pacemaker.}, Doi = {10.1037//0033-295X.110.1.126}, Key = {fds247649} } @article{fds247650, Author = {Palmer, RG and Arthur, WB and Holland, JH and LeBaron, B}, Title = {An Artificial Stock Market}, Journal = {Artificial Life and Robotics}, Volume = {3}, Year = {1999}, Key = {fds247650} } @article{fds247651, Author = {LeBaron, B and Arthur, WB and Palmer, R}, Title = {Time series properties of an artificial stock market}, Journal = {Journal of Economic Dynamics and Control}, Volume = {23}, Number = {9-10}, Pages = {1487-1516}, Year = {1999}, Abstract = {This paper presents results from an experimental computer simulated stock market. In this market artificial intelligence algorithms take on the role of traders. They make predictions about the future, and buy and sell stock as indicated by their expectations of future risk and return. Prices are set endogenously to clear the market. Time series from this market are analyzed from the standpoint of well-known empirical features in real markets. The simulated market is able to replicate several of these phenomenon, including fundamental and technical predictability, volatility persistence, and leptokurtosis. Moreover, agent behavior is shown to be consistent with these features, in that they condition on the variables that are found to be significant in the time series tests. Agents are also able to collectively learn a homogeneous rational expectations equilibrium for certain parameters giving both time series and individual forecast values consistent with the equilibrium parameter values.}, Key = {fds247651} } @article{fds247652, Author = {Palmer, RG and Adler, J}, Title = {Ground states for large samples of two-dimensional Ising spin glasses}, Journal = {International Journal of Modern Physics C}, Volume = {10}, Number = {4}, Pages = {667-675}, Year = {1999}, Abstract = {We have developed a combinatoric matching method to find the exact groundstate energy for the 2-D Ising spin glass with the ±J distribution and equal numbers of positive and negative bonds. For the largest size (1800 × 1800 plaquettes of spins), we averaged results from 278 samples and for the smaller ones up to 374, 375 samples. We also studied the behavior of the distributions of computer time (CPU) and memory as functions of sample size. We present finite size scaling leading to a groundstate energy estimate of E∞ = -1.40193 ± 2 for the infinite system. We found that the memory scales as the square of sample length and that for a given size, the CPU time appears to have a skewed and high-tailed distribution.}, Key = {fds247652} } @article{fds247653, Author = {Newman, MEJ and Palmer, RG}, Title = {Error estimation in the histogram Monte Carlo method}, Journal = {Journal of Statistical Physics}, Volume = {97}, Number = {5-6}, Pages = {1011-1026}, Year = {1999}, Abstract = {We examine the sources of error in the histogram reweighting method for Monte Carlo data analysis. We demonstrate that, in addition to the standard statistical error which has been studied elsewhere, there are two other sources of error, one arising through correlations in the reweighted samples, and one arising from the finite range of energies sampled by a simulation of finite length. We demonstrate that while the former correction is usually negligible by comparison with statistical fluctuations, the latter may not be, and give criteria for judging the range of validity of histogram extrapolations based on the size of this latter correction.}, Key = {fds247653} } @article{fds247624, Author = {Staddon, JE and Davis, DG and Machado, A and Palmer, RG}, Title = {Cumulative effects model: a response to Williams (1994)}, Journal = {Psychological Review}, Volume = {101}, Number = {4}, Pages = {708-710}, Year = {1994}, Month = {October}, ISSN = {0033-295X}, url = {http://www.ncbi.nlm.nih.gov/pubmed/7984713}, Abstract = {The cumulative effects (CE) model explains free-operant choice by the ratio of total numbers of responses and reinforcements, a probability-like variable. Williams (1994) argues that the model is vulnerable to experiments that disprove melioration, a local probability model. The authors note critical differences between the nonlocal CE model and local probability models that allow the CE model to handle some data with which they are incompatible. All models are simplifications of reality; hence, a model's failures are as revealing as its successes. Williams suggests that simple models may need to be abandoned in favor of a "representational" account. The authors point out that representations must be both acquired and acted on. Acquisition requires processing of responses and reinforcers; action requires decision rules. Models are simply testable suggestions for what these rules and processes might be.}, Doi = {10.1037/0033-295x.101.4.708}, Key = {fds247624} } @article{fds247622, Author = {Rust, J and Miller, JH and Palmer, R}, Title = {Characterizing effective trading strategies. Insights from a computerized double auction tournament}, Journal = {Journal of Economic Dynamics and Control}, Volume = {18}, Number = {1}, Pages = {61-96}, Year = {1994}, ISSN = {0165-1889}, Abstract = {This paper presents a comparative analysis of 30 computer trading programs that participated in a double auction tournament held at the Santa Fe Institute in 1990 and 1991. Our objective is to characterize the form of effective trading strategies in double auction markets. We find that a simple rule-of-thumb is a highly effective and robust performer over a wide range of trading environments, significantly outperforming more complex algorithms that use statistically-based predictions of future transaction prices, explicit optimizing principles, and sophisticated 'learning algorithms'. © 1994.}, Key = {fds247622} } @article{fds247623, Author = {Palmer, RG and Arthur, WB and Holland, JH and LeBaron, B and Tayler, P}, Title = {Artificial economic life: a simple model of a stockmarket}, Journal = {Physica D: Nonlinear Phenomena}, Volume = {75}, Number = {1-3}, Pages = {264-274}, Year = {1994}, ISSN = {0167-2789}, Abstract = {We describe a model of a stockmarket in which independent adaptive agents can buy and sell stock on a central market. The overall market behavior, such as the stock price time series, is an emergent property of the agents' behavior. This approach to modelling a market is contrasted with conventional rational expectations approaches. Our model does not necessarily converge to an equilibrium, and can show bubbles, crashes, and continued high trading volume. © 1994.}, Key = {fds247623} } @article{fds247621, Author = {Davis, DG and Staddon, JE and Machado, A and Palmer, RG}, Title = {The process of recurrent choice.}, Journal = {Psychological Review}, Volume = {100}, Number = {2}, Pages = {320-341}, Year = {1993}, Month = {April}, ISSN = {0033-295X}, url = {http://www.ncbi.nlm.nih.gov/pubmed/8483986}, Abstract = {Recurrent choice has been studied for many years. A static law, matching, has been established, but there is no consensus on the underlying dynamic process. The authors distinguish between dynamic models in which the model state is identified with directly measurable behavioral properties (performance models) and models in which the relation between behavior and state is indirect (state models). Most popular dynamic choice models are local, performance models. The authors show that behavior in different types of discrimination-reversal experiments and in extinction is not explained by 2 versions of a popular local model and that the nonlocal cumulative-effects model is consistent with matching and that it can duplicate the major properties of recurrent choice in a set of discrimination-reversal experiments. The model can also duplicate results from several other experiments on extinction after complex discrimination training.}, Key = {fds247621} } @booklet{Stein90, Author = {STEIN, DL and DOERING, CR and PALMER, RG and VANHEMMEN, JL and MCLAUGHLIN, RM}, Title = {ESCAPE OVER A FLUCTUATING BARRIER - THE WHITE NOISE LIMIT}, Journal = {Journal of Physics A: Mathematical and General}, Volume = {23}, Number = {5}, Pages = {L203-L208}, Year = {1990}, Month = {March}, ISSN = {0305-4470}, url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:A1990CT35800004&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=47d3190e77e5a3a53558812f597b0b92}, Doi = {10.1088/0305-4470/23/5/004}, Key = {Stein90} } @booklet{90, Author = {Ajay, and Palmer, RG}, Title = {Simulation of a toy model with constrained dynamics}, Journal = {Journal of Physics A: Mathematical and General}, Volume = {23}, Number = {11}, Pages = {2139-2145}, Year = {1990}, ISSN = {0305-4470}, url = {http://dx.doi.org/10.1088/0305-4470/23/11/034}, Abstract = {We study a sliding block model incorporating constraints in an attempt to understand the slower than exponential relaxation observed in glassy systems. Blocks are free to slide along the axes of a regular lattice but cannot interpenetrate. We simulate two-dimensional L × L lattices with L = 8, 16, 32 and 64 and different number of vacancies. Three-dimensional L × L × L lattices with L = 4, 8, 16 and 32 and one vacancy are also studied. We find the existence of three time regimes for relaxation towards complete disorder, in both two and three dimensions. In the short-time regime the relaxation follows a stretched exponential law; in the intermediate-time regime there is a √t behaviour; and in the long-time regime the relaxation is exponential. In the intermediate- and long-time regimes the results agree well with the theoretical results of Brummelhuis and Hilhorst. The stretched exponential behaviour in the short-time regime is a natural consequence of the constrained dynamics. © 1990 IOP Publishing Ltd.}, Doi = {10.1088/0305-4470/23/11/034}, Key = {90} } @booklet{Hansen89, Author = {Hansen, GE and Palmer, RG}, Title = {Compact nuclear-power source critical experiments and analysis}, Journal = {Nuclear Science And Engineering}, Volume = {103}, Number = {3}, Pages = {237-246}, Year = {1989}, Month = {November}, Key = {Hansen89} } @booklet{Stein89, Author = {Stein, DL and Palmer, RG and Hemmen, JLV and Doering, CR}, Title = {Mean exit times over fluctuating barriers}, Journal = {Physics Letters A}, Volume = {136}, Number = {7-8}, Pages = {353-357}, Year = {1989}, ISSN = {0375-9601}, Abstract = {We investigate the problem of thermal activation over a fluctuating barrier. Three regimes are considered: the fluctuations slow compared to the mean crossing time τA of the average barrier height, fluctuations on roughly the same timescale as τA, and fluctuations extremely fast compared to τA. In the latter two cases, the mean barrier crossing time is reduced. The relevance of these results to a variety of problems in complex systems is discussed. © 1989.}, Key = {Stein89} } @article{fds247620, Author = {Palmer, RG}, Title = {The role of constraints in glassy relaxation}, Journal = {Nuclear Physics B Proceedings Supplements}, Volume = {5}, Number = {1}, Pages = {81-}, Year = {1988}, ISSN = {0920-5632}, Key = {fds247620} } @booklet{Stein88, Author = {Stein, DL and Palmer, RG}, Title = {Nature of the glass transition}, Journal = {Physical Review. B, Condensed Matter}, Volume = {38}, Number = {16}, Pages = {12035-12038}, Year = {1988}, ISSN = {0163-1829}, url = {http://dx.doi.org/10.1103/PhysRevB.38.12035}, Abstract = {We propose a picture whereby the kinetic glass transition observed in the laboratory is controlled by an underlying phase transition with unusual properties. We assume that the line of metastable liquid states below the freezing temperature ends in a fixed point, and show that this picture is in accord with a number of experimental observations, including the vanishing of the excess configurational entropy of the liquid and the Vogel-Fulcher law. Differences between this scenario and current theories of systems whose Hamiltonian possesses quenched disorder are discussed. © 1988 The American Physical Society.}, Doi = {10.1103/PhysRevB.38.12035}, Key = {Stein88} } @booklet{Adler87, Author = {Adler, J and Palmer, RG and Meyer, H}, Title = {Transmission of order in some unusual dilute systems}, Journal = {Physical Review Letters}, Volume = {58}, Number = {9}, Pages = {882-885}, Year = {1987}, ISSN = {0031-9007}, url = {http://dx.doi.org/10.1103/PhysRevLett.58.882}, Abstract = {As a system is diluted, the critical temperature Tc may fall to zero at a concentration xc greater than the percolation concentration pc, because mere connectivity does not guarantee the transmission of order even at T=0. Detailed results, including bounds on xc, are presented for the three-state Potts antiferromagnet on a triangular lattice and for quadrupolar models of (o-H2)x(p-H2)1-x hydrogen mixtures on fcc and triangular lattices. © 1987 The American Physical Society.}, Doi = {10.1103/PhysRevLett.58.882}, Key = {Adler87} } @article{fds327832, Author = {PALMER, RG}, Title = {Parallels and Contrasts between Glass and Spin Glass}, Journal = {Annals of the New York Academy of Sciences}, Volume = {484}, Number = {1}, Pages = {109-120}, Year = {1986}, Month = {December}, url = {http://dx.doi.org/10.1111/j.1749-6632.1986.tb49566.x}, Doi = {10.1111/j.1749-6632.1986.tb49566.x}, Key = {fds327832} } @article{fds247619, Author = {Palmer, RG and Frisch, HL}, Title = {Low-and high-dimension limits of a phase separation model}, Journal = {Journal of Statistical Physics}, Volume = {38}, Number = {5-6}, Pages = {867-872}, Year = {1985}, ISSN = {0022-4715}, url = {http://dx.doi.org/10.1007/BF01010420}, Abstract = {We study a simple zero-temperature model for phase separation of a binary alloy, in which nearest-neighbor interchange can occur if the fraction of AB pairs is not thereby increased. We present analytic results for the one-dimensional case and numerical results for the infinite dimensionality limit on a Cayley tree. In neither limit does the final fraction of AB pairs agree with the dimension-independent result found previously in d=3, 4, 5. © 1985 Plenum Publishing Corporation.}, Doi = {10.1007/BF01010420}, Key = {fds247619} } @booklet{Palmer85b, Author = {Palmer, RG and Jr, FTB}, Title = {High-temperature expansion for a diluted spin-glass model}, Journal = {Journal of Physics. C. Solid State Physics}, Volume = {18}, Number = {1}, Pages = {171-180}, Year = {1985}, ISSN = {0022-3719}, url = {http://dx.doi.org/10.1088/0022-3719/18/1/021}, Abstract = {The high-temperature Edwards-Anderson susceptibility series is studied for a diluted Ising spin-glass model. The model has +J, -J and 0 nearest-neighbour bonds, with probabilities c/2, c/2, 1-c respectively, on a d-dimensional hypercubic lattice. For d>or approximately=5 there is a spin-glass phase for 1>or=c>or=cp(d) where cp(d) is the bond percolation concentration. For 2<d<or approximately=4 a spin-glass phase appears at sufficient dilution. 1>cmax(d)>c>cp(d), but probably not at c=1.}, Doi = {10.1088/0022-3719/18/1/021}, Key = {Palmer85b} } @booklet{Palmer85, Author = {Palmer, RG}, Title = {Correction}, Journal = {Physical Review Letters}, Volume = {54}, Number = {17}, Pages = {1965-1965}, Year = {1985}, ISSN = {0031-9007}, url = {http://dx.doi.org/10.1103/PhysRevLett.54.1965}, Doi = {10.1103/PhysRevLett.54.1965}, Key = {Palmer85} } @booklet{Palmer85a, Author = {Palmer, RG and Frisch, HL}, Title = {Low-dimension and high-dimension limits of a phase-separation model}, Journal = {Journal Of Statistical Physics}, Volume = {38}, Number = {5-6}, Pages = {867-872}, Year = {1985}, Key = {Palmer85a} } @booklet{Randeria85, Author = {Randeria, M and Sethna, JP and Palmer, RG}, Title = {Low-frequency relaxation in ising spin-glasses}, Journal = {Physical Review Letters}, Volume = {54}, Number = {12}, Pages = {1321-1324}, Year = {1985}, ISSN = {0031-9007}, url = {http://dx.doi.org/10.1103/PhysRevLett.54.1321}, Abstract = {For d-dimensional short-range Ising spin-glasses with local spin-flip dynamics, the correlation function si(0)si(t)is argued to be bounded below by a function of the form exp[-c(lnt)d(d-1)] in a temperature range above the spin-glass transition. The slow relaxation of large isolated clusters of unfrustrated spins is responsible for this bound. We suggest that this is the signature for an intermediate Griffiths phase between the spin-glass and the paramagnetic phases. © 1985 The American Physical Society.}, Doi = {10.1103/PhysRevLett.54.1321}, Key = {Randeria85} } @booklet{Palmer85c, Author = {Palmer, RG and Stein, DL and Abrahams, E and Anderson, PW}, Title = {Palmer et al. respond}, Journal = {Physical Review Letters}, Volume = {54}, Number = {4}, Pages = {365-}, Year = {1985}, ISSN = {0031-9007}, url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:A1985AAM0100033&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=47d3190e77e5a3a53558812f597b0b92}, Doi = {10.1103/PhysRevLett.54.365}, Key = {Palmer85c} } @article{fds304606, Author = {Palmer, RG and Stein, DL and Abrahams, E and Anderson, PW}, Title = {Erratum: Models of hierarchically constrained dynamics for glassy relaxation (Physical Review Letters (1985) 54,17 (1965))}, Journal = {Physical Review Letters}, Volume = {54}, Number = {17}, Pages = {1965-}, Year = {1985}, ISSN = {0031-9007}, url = {http://dx.doi.org/10.1103/PhysRevLett.54.1965}, Doi = {10.1103/PhysRevLett.54.1965}, Key = {fds304606} } @booklet{Palmer84, Author = {Palmer, RG and Stein, DL and Abrahams, E and Anderson, PW}, Title = {Models of Hierarchically Constrained Dynamics for Glassy Relaxation}, Journal = {Physical Review Letters}, Volume = {53}, Number = {10}, Pages = {958-961}, Year = {1984}, Month = {September}, ISSN = {0031-9007}, url = {http://dx.doi.org/10.1103/PhysRevLett.53.958}, Abstract = {A class of models for relaxation in strongly interacting glassy materials is suggested. Degrees of freedom are divided into a sequence of levels such that those in level n+1 are locked except when some of those in level n find the right combination to release them, this representing the hierarchy of constraints in real systems. The Kohlrausch anomalous relaxation law, exp[-(t)2], emerges naturally, and a maximum time scale is found which exhibits a Vogel-Fulcher-type temperature dependence. © 1984 The American Physical Society.}, Doi = {10.1103/PhysRevLett.53.958}, Key = {Palmer84} } @article{fds247616, Author = {Hopfield, JJ and Feinstein, DI and Palmer, RG}, Title = {'Unlearning' has a stabilizing effect in collective memories.}, Journal = {Nature}, Volume = {304}, Number = {5922}, Pages = {158-159}, Year = {1983}, Month = {July}, url = {http://dx.doi.org/10.1038/304158a0}, Abstract = {Crick and Mitchison have presented a hypothesis for the functional role of dream sleep involving an 'unlearning' process. We have independently carried out mathematical and computer modelling of learning and 'unlearning' in a collective neural network of 30-1,000 neurones. The model network has a content-addressable memory or 'associative memory' which allows it to learn and store many memories. A particular memory can be evoked in its entirety when the network is stimulated by any adequate-sized subpart of the information of that memory. But different memories of the same size are not equally easy to recall. Also, when memories are learned, spurious memories are also created and can also be evoked. Applying an 'unlearning' process, similar to the learning processes but with a reversed sign and starting from a noise input, enhances the performance of the network in accessing real memories and in minimizing spurious ones. Although our model was not motivated by higher nervous function, our system displays behaviours which are strikingly parallel to those needed for the hypothesized role of 'unlearning' in rapid eye movement (REM) sleep.}, Doi = {10.1038/304158a0}, Key = {fds247616} } @booklet{Palmer83, Author = {PALMER, RG}, Title = {BROKEN ERGODICITY IN SPIN-GLASSES}, Journal = {Lecture Notes in Physics}, Volume = {192}, Pages = {234-251}, Year = {1983}, ISSN = {0075-8450}, url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:A1983SB51100013&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=47d3190e77e5a3a53558812f597b0b92}, Key = {Palmer83} } @booklet{Palmer82, Author = {Palmer, RG}, Title = {Broken ergodicity}, Journal = {Advances in Physics}, Volume = {31}, Number = {6}, Pages = {669-735}, Year = {1982}, Month = {December}, ISSN = {0001-8732}, url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:A1982QB70500002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=47d3190e77e5a3a53558812f597b0b92}, Doi = {10.1080/00018738200101438}, Key = {Palmer82} } @booklet{Vanhemmen82, Author = {Hemmen, JLV and Palmer, RG}, Title = {The thermodynamic limit and the replica method for short-range random systems}, Journal = {Journal of Physics A: Mathematical and General}, Volume = {15}, Number = {12}, Pages = {3881-3890}, Year = {1982}, Month = {December}, ISSN = {0305-4470}, url = {http://dx.doi.org/10.1088/0305-4470/15/12/037}, Abstract = {Short-range spin systems with random interactions are considered. A simple proof is given showing that the free energy of almost every sample converges to the average free energy in the thermodynamic limit. A stronger criterion, thermodynamic convergence, is also demonstrated. This implies that the N to infinity and n to 0 limits may be interchanged in the replica method.}, Doi = {10.1088/0305-4470/15/12/037}, Key = {Vanhemmen82} } @booklet{Kolan82, Author = {Kolan, AJ and Palmer, RG}, Title = {Ground state properties of a spin glass model}, Journal = {Journal of Applied Physics}, Volume = {53}, Number = {3}, Pages = {2198-2200}, Year = {1982}, ISSN = {0021-8979}, url = {http://dx.doi.org/10.1063/1.330972}, Abstract = {A new algorithm has been developed to find ground state properties of finite two-dimensional lattices of Ising spins with +J, -J, or O interaction strengths. The algorithm is based on a list of all possible string assignments on a boundary which divides the sample in two. Averaged ground state properties are presented for random lattices in which +J occurs with probability p, -J with probability q, and O with probability r (p+q+r = 1). Evidence for zero temperature phase transitions between paramagnetic, ferromagnetic, antiferromagnetic, and possible spin glass phases is discussed.}, Doi = {10.1063/1.330972}, Key = {Kolan82} } @booklet{Palmer81a, Author = {Palmer, RG}, Title = {Application of coupled reactor theory to explain reactivity slumping effects in heterogeneous lmfbrs}, Journal = {Transactions Of The American Nuclear Society}, Volume = {38}, Number = {JUN}, Pages = {415-416}, Year = {1981}, Key = {Palmer81a} } @booklet{Palmer81, Author = {Palmer, RG}, Title = {Shielding optimization studies for a space reactor system}, Journal = {Transactions Of The American Nuclear Society}, Volume = {39}, Pages = {764-765}, Year = {1981}, Key = {Palmer81} } @booklet{Bantilan81, Author = {Jr, FTB and Palmer, RG}, Title = {Magnetic properties of a model spin glass and the failure of linear response theory}, Journal = {Journal of Physics F. Metal Physics}, Volume = {11}, Number = {1}, Pages = {261-266}, Year = {1981}, ISSN = {0305-4608}, url = {http://dx.doi.org/10.1088/0305-4608/11/1/026}, Abstract = {Zero-temperature computer simulations are reported for the Sherrington-Kirkpatrick random Ising model of a spin glass, including an external field. Results are presented for the internal field distribution P(H), and for the ground state energy and magnetisation as functions of field. P(H) has a linear rise from H=0 for all external fields. The zero-temperature susceptibility chi (0) is close to unity when equilibrium states are examined, in agreement with Parisi's replica symmetry breaking theory and in conflict with linear response theory. The linear response result chi (0)=0 can be obtained by searching for metastable local energy minima close to the zero-field ground state in configuration space.}, Doi = {10.1088/0305-4608/11/1/026}, Key = {Bantilan81} } @booklet{Kolan80a, Author = {KOLAN, AJ and PALMER, RG}, Title = {DISTRIBUTION OF FRUSTRATED PLAQUETTES FOR THE RANDOM 2D ISING-MODEL}, Journal = {Bulletin- American Physical Society}, Volume = {25}, Number = {3}, Pages = {206-206}, Year = {1980}, ISSN = {0003-0503}, url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:A1980JG27900310&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=47d3190e77e5a3a53558812f597b0b92}, Key = {Kolan80a} } @booklet{Bantilan80, Author = {BANTILAN, FT and PALMER, RG}, Title = {ZERO-TEMPERATURE PROPERTIES OF INFINITE-RANGE ISING SPIN-GLASS MODELS}, Journal = {Bulletin- American Physical Society}, Volume = {25}, Number = {3}, Pages = {206-206}, Year = {1980}, ISSN = {0003-0503}, url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:A1980JG27900307&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=47d3190e77e5a3a53558812f597b0b92}, Key = {Bantilan80} } @booklet{Kolan80, Author = {Kolan, AJ and Palmer, RG}, Title = {Distribution of frustrated plaquettes in the random bond square lattice}, Journal = {Journal of Physics. C. Solid State Physics}, Volume = {13}, Number = {23}, Pages = {L575-L580}, Year = {1980}, ISSN = {0022-3719}, url = {http://dx.doi.org/10.1088/0022-3719/13/23/002}, Abstract = {Computer simulation is used to examine the spatial distribution of frustrated plaquettes in a square lattice of random +1 and -1 bonds. While the bonds are uncorrelated, the frustrated plaquettes are not. The average separation of a frustrated plaquette from its nearest frustrated neighbour shows a feature consistent with Schuster's pair dissociation transition at c=0.707, where c is the concentration of positive bonds. It also possesses a narrow peak at c approximately=0.9, which may be related to a phase boundary in the Ising spin system on this lattice.}, Doi = {10.1088/0022-3719/13/23/002}, Key = {Kolan80} } @booklet{Palmer80a, Author = {PALMER, RG}, Title = {INFORMATION, ORDER, AND DEGENERACY IN RANDOM-SYSTEMS}, Journal = {Bulletin- American Physical Society}, Volume = {25}, Number = {3}, Pages = {349-349}, Year = {1980}, ISSN = {0003-0503}, url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:A1980JG27901275&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=47d3190e77e5a3a53558812f597b0b92}, Key = {Palmer80a} } @booklet{Palmer80, Author = {Palmer, RG}, Title = {Charged hard sphere results for the one-component plasma}, Journal = {The Journal of Chemical Physics}, Volume = {73}, Number = {4}, Pages = {2009-2010}, Year = {1980}, ISSN = {0021-9606}, Key = {Palmer80} } @article{fds247613, Author = {Hemmen, JLV and Palmer, RG}, Title = {The replica method and solvable spin glass model}, Journal = {Journal of Physics A: Mathematical and General}, Volume = {12}, Number = {4}, Pages = {563-580}, Year = {1979}, ISSN = {0305-4470}, url = {http://dx.doi.org/10.1088/0305-4470/12/4/016}, Abstract = {The replica method for random systems is critically examined, with particular emphasis on its application to the Sherrington-Kirkpatrick solution of a 'solvable' spin glass model. The procedure is improved and extended in several ways, including the avoidance of steepest descents and a reformulation which isolates the thermodynamic limit N to infinity . Ideas of analyticity and convexity are employed to investigate the two most dubious steps in the replica method: the extension from an integer number (n) of replicas to real n in the limit n to 0, and the reversal of the limits in n and N. The latter step is proved valid for the Sherrington-Kirkpatrick problem, while the non-uniqueness of the former is held responsible for the unphysical behaviour of the result.}, Doi = {10.1088/0305-4470/12/4/016}, Key = {fds247613} } @article{fds247614, Author = {Palmer, RG and Pond, CM}, Title = {Internal field distributions in model spin glasses}, Journal = {Journal of Physics F. Metal Physics}, Volume = {9}, Number = {7}, Pages = {1451-1459}, Year = {1979}, ISSN = {0305-4608}, url = {http://dx.doi.org/10.1088/0305-4608/9/7/024}, Abstract = {The zero temperature probability distribution P(h) of internal magnetic fields is studied, both in the Sherrington-Kirkpatrick random Ising model of a spin glass and in its natural extension to classical vector spins. Theoretical predictions and computer simulations agree that P(h) is linear for small h in the Ising case, and has a hole-P(h)=0 for h< eta -in the vector spin case.}, Doi = {10.1088/0305-4608/9/7/024}, Key = {fds247614} } @article{fds247615, Author = {Gould, H and Palmer, RG and Estévez, GA}, Title = {Asymptotic form of the mean spherical approximation for the internal energy of the classical one-component plasma}, Journal = {Journal of Statistical Physics}, Volume = {21}, Number = {1}, Pages = {55-64}, Year = {1979}, ISSN = {0022-4715}, url = {http://dx.doi.org/10.1007/BF01011481}, Abstract = {The mean spherical approximation for the internal energy U of the classical one-component plasma is solved exactly in the limit γ ≫ 1, where γ is the usual Coulomb coupling parameter. The result {Mathematical expression} is consistent with DeWitt's empirical analysis of the mean spherical approximation. © 1979 Plenum Publishing Corporation.}, Doi = {10.1007/BF01011481}, Key = {fds247615} } @article{fds323247, Author = {Thouless, DJ and Anderson, PW and Palmer, RG}, Title = {Solution of 'Solvable model of a spin glass'}, Journal = {Philosophical Magazine}, Volume = {35}, Number = {3}, Pages = {593-601}, Year = {1977}, Month = {March}, url = {http://dx.doi.org/10.1080/14786437708235992}, Doi = {10.1080/14786437708235992}, Key = {fds323247} } @article{fds247611, Author = {Anderson, PW and Thouless, DJ and Palmer, RG}, Title = {Comment on "The third law of thermodynamics and the theory of spin glasses" by E.P. Wohlfarth}, Journal = {Physics Letters A}, Volume = {62}, Number = {6}, Pages = {456-}, Year = {1977}, ISSN = {0375-9601}, Abstract = {A critical letter about the TAP theory of spin glasses is shown to be irrelevant, and some remarks about the "third law" of thermodynamics are made. © 1977.}, Key = {fds247611} } @article{fds247610, Author = {Anderson, PW and Itoh, N and Alpar, MA and Tosatti, E and Palmer, RG}, Title = {Positively charged isospin wave softening and proton lattice in neutron stars}, Journal = {Lettere al Nuovo Cimento Series 2}, Volume = {12}, Number = {6}, Pages = {165-170}, Year = {1975}, ISSN = {0375-930X}, url = {http://dx.doi.org/10.1007/BF02785970}, Doi = {10.1007/BF02785970}, Key = {fds247610} } @article{fds247612, Author = {Palmer, RG}, Title = {Neutron star cores}, Journal = {Astrophysics and Space Science}, Volume = {34}, Number = {1}, Pages = {209-222}, Year = {1975}, ISSN = {0004-640X}, url = {http://dx.doi.org/10.1007/BF00646761}, Abstract = {Current theories, and the astrophysical implications, of the nature of high density neutron star matter are reviewed. Suggestions are made for a compromise between the alternatives of neutron crystallization and pion condensation. © 1975 D. Reidel Publishing Company.}, Doi = {10.1007/BF00646761}, Key = {fds247612} } @article{fds247609, Author = {Palmer, RG and Anderson, PW}, Title = {Corresponding-states approach to nuclear and neutron-star matter}, Journal = {Physical Review D}, Volume = {9}, Number = {12}, Pages = {3281-3291}, Year = {1974}, ISSN = {0556-2821}, url = {http://dx.doi.org/10.1103/PhysRevD.9.3281}, Abstract = {The properties of nuclear matter and dense neutron-star matter are studied by an approach which largely avoids the microscopic assumptions of nuclear-matter theory. The method is empirical, employing an extended form of the law of corresponding states to deduce the properties of nuclear systems from those of laboratory substances such as helium. It is possible to predict the solidification pressure and density, the compressibility, and the critical temperature of nuclear and neutron-star matter. As previously reported, a comparatively low solidification pressure is found for neutron-star matter, implying a solid core for most neutron stars. © 1974 The American Physical Society.}, Doi = {10.1103/PhysRevD.9.3281}, Key = {fds247609} } @article{fds247608, Author = {Palmer, RG and Weeks, JD}, Title = {Exact solution of the mean spherical model for charged hard spheres in a uniform neutralizing background}, Journal = {The Journal of Chemical Physics}, Pages = {4171-4174}, Year = {1973}, ISSN = {0021-9606}, Abstract = {The exact solution of the mean spherical model integral equation is found for a system of charged hard spheres in a uniform neutralizing background. This may be considered as a simple example of a fluid with nonadditive hard sphere diameters. Analytic expressions are given for the direct correlation function and for the Laplace transform of the radial distribution function. These, and the thermodynamic properties of the system, are compared with previous solutions of the mean spherical model.}, Key = {fds247608} }