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Concept in cosmology
More unsolved problems in physics In cosmology, the cosmological constant problem or vacuum catastrophe is the substantial disagreement between the observed
Cosmological_constant_problem
Problem of deciding whether an expression equals zero
the constant problem is the problem of deciding whether a given expression is equal to zero. This problem is also referred to as the identity problem or
Constant_problem
Unsolved problem in physics
than gravity. A hierarchy problem occurs when the fundamental value of some physical parameter, such as a coupling constant or a mass, in some Lagrangian
Hierarchy_problem
Value representing energy density of space
cosmological constant. The explanation of this small but positive value is a remaining theoretical challenge, the so-called cosmological constant problem. Some
Cosmological_constant
Philosophical thought experiment
(2007). "Sinks in the landscape, Boltzmann brains and the cosmological constant problem". Journal of Cosmology and Astroparticle Physics. 2007 (1): 022. arXiv:hep-th/0611043
Boltzmann_brain
Unsolved geometry question on moving a sofa through a 90° angle
thus obtained is referred to as the sofa constant. The exact value of the sofa constant is an open problem. The leading solution, by Joseph L. Gerver
Moving_sofa_problem
Collection of possible string theory vacua
vacua, the problem of finding one with a sufficiently small cosmological constant is NP complete. This is a version of the subset sum problem. A possible
String_theory_landscape
Physics problem related to laws of motion and gravity
In physics, specifically classical mechanics, the three-body problem is to take the initial positions and velocities (or momenta) of three point masses
Three-body_problem
2.71828…, base of natural logarithms
itself as a quantity of interest. The constant itself was introduced by Jacob Bernoulli in 1683, for solving the problem of continuous compounding of interest
E_(mathematical_constant)
Lowest possible energy of a quantum system or field
universe we observe today. This discrepancy is known as the cosmological constant problem and it is one of the greatest unsolved mysteries in physics. Many physicists
Zero-point_energy
Physical constant in quantum mechanics
The Planck constant, or Planck's constant, denoted by h {\displaystyle h} , is a fundamental physical constant of foundational importance in quantum mechanics:
Planck_constant
Background energy existing in space
problem in physics Why does the zero-point energy of the vacuum not cause a large cosmological constant? What cancels it out? More unsolved problems in
Vacuum_energy
universe? Cosmological constant problem: Why does the zero-point energy of the vacuum not cause a large cosmological constant? Size and shape of the universe:
List of unsolved problems in astronomy
List_of_unsolved_problems_in_astronomy
Method for evaluating indefinite integrals
functions.[example needed] Specifically, the algorithm cannot solve the constant problem, which is undecidable when it needs to determine whether an arbitrary
Risch_algorithm
Energy driving the accelerated expansion of the universe
and clusters, but some problems appeared in the late 1980s: in particular, the model required a value for the Hubble constant lower than preferred by
Dark_energy
Fixed number that has received a name
facilitate using it across multiple mathematical problems. Constants arise in many areas of mathematics, with constants such as e and π occurring in such diverse
Mathematical_constant
Quantum field theory of electromagnetism
compared to experimental observation value.This is called cosmological constant problem or vacuum catastrophe. The first formulation of a quantum theory describing
Quantum_electrodynamics
Difference between logarithm and harmonic series
mathematical constant after π and e makes the irrationality of γ a major open question in mathematics. Unsolved problem in mathematics Is Euler's constant irrational
Euler's_constant
Physical constant with no units
In physics, a dimensionless physical constant is a physical constant that is dimensionless, i.e. a pure number having no units attached and having a numerical
Dimensionless physical constant
Dimensionless_physical_constant
Halting probability of a random computer program
answer to these problems. But as the halting problem is not generally solvable, calculating any but the first few bits of Chaitin's constant is not possible
Chaitin's_constant
Physical theory of the cosmos
cosmological constant but also extending to more exotic forms of quintessence or other modified gravity schemes. A cosmological constant problem, sometimes
Big_Bang
Physical constant relating particle kinetic energy with temperature
The Boltzmann constant (kB or k) is the proportionality factor that relates the average relative thermal energy of particles in a gas with the thermodynamic
Boltzmann_constant
this problem, see articles by Eric W. Weisstein at Wolfram MathWorld (all articles accessed 22 August 2024): Euler's Constant Catalan's Constant Apéry's
List of unsolved problems in mathematics
List_of_unsolved_problems_in_mathematics
Physical constant for the strength of gravity induced by a mass
The gravitational constant is an empirical physical constant that gives the strength of the gravitational field induced by a mass. It is involved in the
Gravitational_constant
is false? Cosmological constant problem: Why does the zero-point energy of the vacuum not cause a large cosmological constant? What cancels it out? Dark
List of unsolved problems in physics
List_of_unsolved_problems_in_physics
German cargo glider
the problems with ground handling, although the payload was reduced. Vulnerability to ground fire and aerial attack remained a constant problem during
Messerschmitt_Me_321_Gigant
Universal and unchanging physical quantity
A physical constant, sometimes called a fundamental physical constant or universal constant, is a physical quantity that cannot be explained by a theory
Physical_constant
Theories in particle physics and cosmology
bulk appear to be promising in addressing the so-called cosmological constant problem. One of the earliest documented attempts to apply brane cosmology as
Brane_cosmology
Estimate of time taken for running an algorithm
considered constant time. Importantly, the term "constant time" does not mean the running time must be entirely independent of the problem size; rather
Time_complexity
American physicist
proposed the string theory landscape as a solution to the cosmological constant problem. Bousso was born in Haifa, Israel, the son of late scientist Dino Bousso [wd]
Raphael_Bousso
names to facilitate using it across multiple mathematical problems. For example, the constant π may be defined as the ratio of the length of a circle's
List of mathematical constants
List_of_mathematical_constants
Dimensionless number that quantifies the strength of the electromagnetic interaction
fine-structure constant, also known as the Sommerfeld constant, commonly denoted by α (the Greek letter alpha), is a fundamental physical constant that quantifies
Fine-structure_constant
Numerical observation in cosmology
energy contributions from matter and dark energy. Cosmological constant problem Flatness problem Fine-tuned universe O’Raifeartaigh, Cormac; O’Keeffe, Michael;
Cosmic_coincidence_problem
Unsolved problem in computer science
Unsolved problem in computer science If the solution to a problem can be checked in polynomial time, must the problem be solvable in polynomial time? More
P_versus_NP_problem
Possible fate of the universe
(2007). "Sinks in the landscape, Boltzmann brains and the cosmological constant problem". Journal of Cosmology and Astroparticle Physics. 2007 (1): 022. arXiv:hep-th/0611043
Heat_death_of_the_universe
Problem in physics and astronomy
net force and torque on the particle. Nevertheless, Euler's problem has a second constant of motion C = r 1 2 r 2 2 d θ 1 d t d θ 2 d t + 2 a ( μ 1 cos
Euler's_three-body_problem
Constant e raised to the power of pi
number. The constant was mentioned in Hilbert's seventh problem alongside the Gelfond–Schneider constant 2√2, and the name "Gelfond's constant" stems from
Gelfond's_constant
Unsolved problem in mathematics
mathematics, the Skolem problem (also called the Skolem-Pisot problem) is the problem of determining whether the values of a constant-recursive sequence include
Skolem_problem
Theories about the end of the universe
(2007). "Sinks in the landscape, Boltzmann brains and the cosmological constant problem". Journal of Cosmology and Astroparticle Physics. 2007 (1): 022. arXiv:hep-th/0611043
Ultimate_fate_of_the_universe
Unsolved problem in mathematics
Unsolved problem in mathematics Is every sufficiently large sequence of square numbers with constant second difference necessarily a sequence of consecutive
Büchi's_problem
Probability of shared birthdays
In probability theory, the birthday problem asks for the probability that, in a set of n randomly chosen people, at least two will share the same birthday
Birthday_problem
Proposal concerning the state of the universe prior to the Planck epoch
physrep.2023.06.002. Weinberg, Steven (1989-01-01). "The cosmological constant problem". Reviews of Modern Physics. 61 (1): 1–23. Bibcode:1989RvMP...61..
Hartle–Hawking_proposal
Complexity class of approximable problems
NP optimization problems that allow polynomial-time approximation algorithms with approximation ratio bounded by a constant (or constant-factor approximation
APX
Violation of charge-parity symmetry in particle physics and cosmology
interactions. It is important to the matter-antimatter asymmetry problem, the strong CP problem, and in the study of weak interactions in particle physics.
CP_violation
Problem in mathematical optimisation
problem: In an unbounded plane where the wind distribution is given by a vector field as a function of position and time, a ship moves with constant velocity
Zermelo's_navigation_problem
British physicist (born 1975)
received the Buchalter Cosmology Prize for their work on the cosmological constant problem. Kaloper and Padilla devised a new strategy; this involved rewriting
Antonio_Padilla
Comprehensive physical model
gauge symmetry and thus several force carriers, but one unified coupling constant. Unifying gravity with the electronuclear interaction would provide a more
Grand_Unified_Theory
Number, approximately 0.916
it is an unsolved problem (one of Landau's problems) whether there are even infinitely many primes of this form. Catalan's constant also appears in the
Catalan's_constant
Differential geometry conjecture
Riemannian manifold (M,g), the metric fg has constant scalar curvature. Additionally, the Yamabe problem as posed in similar settings, such as for complete
Yamabe_problem
Cosmological fine-tuning problem
The flatness problem (also known as the oldness problem) is a cosmological fine-tuning problem within the Big Bang model of the universe. Measurements
Flatness_problem
Hypothetical form of matter
Christof Wetterich introduced a cosmon model to explain the cosmological constant problem. In 1989, Hans Dehmelt attempted to modernize the idea of the primeval
Cosmon
Region in Gironde, Nouvelle-Aquitaine, France
a comparatively mild climate and high rainfall making grape rot a constant problem. It is generally believed that the nature of the region's wine derives
Médoc
Chinese cancelled jet fighter project
airframes were tested in total. As progress on the airframe continued, a constant problem that had arisen in similar Chinese fighter aircraft projects, such
Shenyang_J-13
Adjustment of parameters to fit data in theoretical physics
solution to problems in physics; and that it had usually done so earlier than expected. However, in addressing the problem of the cosmological constant, naturalness
Fine-tuning_(physics)
Hypothetical physical concept
gravity. Finding such a theory of everything is one of the major unsolved problems in physics. Numerous popular books apply the words "theory of everything"
Theory_of_everything
Mathematical problem involving optimal stopping theory
known as the marriage problem, the sultan's dowry problem, the fussy suitor problem, the googol game, and the best choice problem. Its solution is also
Secretary_problem
Theory of gravity
initial value problem and its equations of motion coincide with the initial value problem and equations of motion of the ADM formalism in constant mean extrinsic
Shape_dynamics
Motion problem in classical mechanics
the two-body problem is used to calculate and predict the motion of two massive bodies that are orbiting each other in space. The problem assumes that
Two-body_problem
Mathematics of a particle physics model
2012). "Everything you always wanted to know about the cosmological constant problem (but were afraid to ask)". Comptes Rendus Physique. 13 (6–7): 566–665
Mathematical formulation of the Standard Model
Mathematical_formulation_of_the_Standard_Model
Branch of physics
869–900. ISBN 978-0224044479. Weinberg, Steven (1989). "The Cosmological Constant Problem". Reviews of Modern Physics. 61: 1–23. doi:10.1103/RevModPhys.61.1
Theoretical_physics
Shape that blocks all lines of sight
forests. Opaque sets were introduced by Stefan Mazurkiewicz in 1916, and the problem of minimizing their total length was posed by Frederick Bagemihl in 1959
Opaque_set
Air warfare branch of Senegal's military
Senegalese forces, medevac and maritime patrol. Funding remains a constant problem for the Senegalese Air Force and the increasing cost of aviation fuel
Senegalese_Air_Force
American aircraft designer
upset that engineers were not putting enough effort into solving a constant problem with violent engine unstarts in flight, Rich considered taking a flight
Ben_Rich_(engineer)
Topics referred to by the same term
the free dictionary. Vacuum catastrophe can mean: the cosmological constant problem in cosmology the divergence in the calculation of vacuum energy in
Vacuum catastrophe (disambiguation)
Vacuum_catastrophe_(disambiguation)
Branch of physics that studies mathematical models of the universe
"Vacuum catastrophe: An elementary exposition of the cosmological constant problem". American Journal of Physics. 63 (7): 620–626. Bibcode:1995AmJPh.
Physical_cosmology
5th episode of the 4th season of Lost
"The Constant" is the fifth episode of the fourth season of the American Broadcasting Company's (ABC) serial drama television series Lost, and the 77th
The_Constant
Number, approximately 3.14
The number π (/paɪ/ ; spelled out as pi) is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its
Pi
Sum of the inverses of the positive cubes
proved that it is an irrational number. Apéry's constant arises naturally in a number of physical problems, including in the second- and third-order terms
Apéry's_constant
Swiss theoretical physicist
he has proposed a solution to the cosmological constant problem from arguing that Newton's constant varies globally. In 2015 and 2016, Lombriser predicted
Lucas_Lombriser
Hypothesis relating age of the universe to physical constants
physical constant – Physical constant with no units Hierarchy problem – Unsolved problem in physics Time-variation of fundamental constants – Hypothetical
Dirac large numbers hypothesis
Dirac_large_numbers_hypothesis
polarization constants (also known as Chebyshev constants) are solutions to a max-min problem for potentials. Originally, these problems were introduced
Polarization_constants
Undecidability of equality of real numbers
school algebra problem – Mathematical problem Dan Richardson and John Fitch, 1994, "The identity problem for elementary functions and constants Archived 2024-05-04
Richardson's_theorem
Sum of inverse squares of natural numbers
The Basel problem is a problem in mathematical analysis with relevance to number theory, concerning an infinite sum of inverse squares. It was first posed
Basel_problem
Theories trying to extend known physics
the strong CP problem, neutrino oscillations, matter–antimatter asymmetry, and the nature of dark matter and dark energy. Another problem lies within the
Physics beyond the Standard Model
Physics_beyond_the_Standard_Model
Speculative physics theory
quantum field theory, and also between the hierarchy problem and the cosmological constant problem. Both issues suggest the possibility of corrections
Fifth_force
Force resulting from the quantisation of a field
Zinkernagel; Zinkernagel (2002). "The quantum vacuum and the cosmological constant problem". Studies in History and Philosophy of Science Part B: Studies in History
Casimir_effect
Complicated set of real numbers
ISBN 9780821815311. Cassels (1957) p.18 Freiman's Constant Weisstein, Eric W. "Freiman's Constant." From MathWorld—A Wolfram Web Resource), accessed
Markov_spectrum
Phenomenon in which a neutrino changes lepton flavor as it travels
existence of neutrino oscillation resolved the long-standing solar neutrino problem. Neutrino oscillation is of great theoretical and experimental interest
Neutrino_oscillation
Prime-generating mathematical constant
Chris K.; Cheng, Yuanyou (2005). "Determining Mills' Constant and a Note on Honaker's Problem". Journal of Integer Sequences. 8. p. 5.4.1. Bibcode:2005JIntS
Mills'_constant
Mathematical counting-out question
computer science and mathematics, the Josephus problem (or Josephus permutation) is a theoretical problem related to a certain counting-out game. Such games
Josephus_problem
Constant expressing ambiguity from indefinite integrals
In calculus, the constant of integration, often denoted by C {\displaystyle C} (or c {\displaystyle c} ), is a constant term added to an antiderivative
Constant_of_integration
Constant used in a magic square
org/view/generic/id/7485/description/Magic_Square_Physics/ 260 as a magic constant for the 8-queens problem and 8x8 magic square Hypercube Math formulae
Magic_constant
Concept in cosmology
to the measure problem. This measure has also been shown to produce good agreement with observational values of the cosmological constant. The stationary
Measure_problem_(cosmology)
Fastest curve descent without friction
uniform gravitational field to a given end point in the shortest time. The problem was posed by Johann Bernoulli in 1696 and famously solved in one night
Brachistochrone_curve
Hypothetical fundamental force
(1988) and Paul Steinhardt et al. (1999) partly solves the cosmological constant problem. In these models, the quintessence field has a density which closely
Quintessence_(physics)
Iranian theoretical physicist
of elementary particle physics such as the hierarchy problem and the cosmological constant problem. He has made contributions to topological string theories
Cumrun_Vafa
Class of problems in classical mechanics
={\frac {h}{r^{2}}}} Since h is constant and r2 is positive, the angle φ changes monotonically in any central-force problem, either continuously increasing
Classical central-force problem
Classical_central-force_problem
Problem in computer science
In computability theory, the halting problem is the decision problem of determining, from a description of an arbitrary computer program and an input
Halting_problem
Problem in combinatorial optimization
The knapsack problem is the following problem in combinatorial optimization: Given a set of items, each with a weight and a value, determine which items
Knapsack_problem
Infinite sequence of numbers satisfying a linear equation
states that the zeros of a constant-recursive sequence have a regularly repeating (eventually periodic) form. The Skolem problem, which asks for an algorithm
Constant-recursive_sequence
Constant in Riemannian geometry
\lambda _{1}(M)\leq 2a(n-1)h(M)+10h^{2}(M).} Cheeger constant (graph theory) Isoperimetric problem Spectral gap Cheeger 1971. Buser 1978. Buser 1982. Buser
Cheeger_constant
Geometrical body
Unsolved problem in mathematics What is the minimum volume among all shapes of the same constant width? More unsolved problems in mathematics In geometry
Surface_of_constant_width
Russian theoretical physicist
phenomena of solid state physics. He proposed a solution to the problem of the cosmological constant from analogies to solid state physics, in which, unlike particle
Grigory_E._Volovik
Yes/no problem in computer science
decision problem is a computational problem that can be posed as a yes–no question on a set of input values. An example of a decision problem is deciding
Decision_problem
1948 film by H. C. Potter
by William Steig. The story follows a married couple who encounter constant problems after their purchase and remodel of a home in the country. The movie
Mr. Blandings Builds His Dream House
Mr._Blandings_Builds_His_Dream_House
Solved question in mathematics
moving at a constant airspeed v, for time T, and the wind is assumed to move in a constant direction with speed w. The solution of the problem is that the
Chaplygin_problem
NP-hard problem in combinatorial optimization
Jakub; Végh, László A. (2018). "A constant-factor approximation algorithm for the asymmetric traveling salesman problem". Proceedings of the 50th Annual
Travelling_salesman_problem
Theory of fundamental physics
the vacuum itself. Thus, in SVT this constant does not have any fundamental physical meaning, and related problems such as the vacuum catastrophe, simply
Superfluid_vacuum_theory
Topics referred to by the same term
Identity problem may refer to: An additional psychiatric condition from DSM-IV, code 313.82. See also: Identity disorder; A constant problem in mathematics
Identity_problem
Pricing problem in Marxism
formation of a general rate of profits, constant across all industries. Marx outlined the transformation problem as a theoretical solution to this discrepancy
Transformation_problem
CONSTANT PROBLEM
CONSTANT PROBLEM
Boy/Male
English Latin
Steady; stable.
Girl/Female
Latin American English French Shakespearean
Firm of purpose. Constancy, from the Latin Constantia.
Girl/Female
Latin English
Firm of purpose. Constancy, from the Latin Constantia.
Girl/Female
Spanish Italian
Constant.
Boy/Male
Australian, British, Danish, English, French, German, Italian, Latin, Swedish, Swiss
Steadfast; Constant
Female
Spanish
Spanish form of Latin Constantia, CONSTANZA means "steadfast."
Girl/Female
Australian, French, German, Latin, Spanish
Constancy; Steadfastness
Boy/Male
Tamil
Nityagopal | நிதà¯à®¯à®•ோபாலÂ
Constant
Nityagopal | நிதà¯à®¯à®•ோபாலÂ
Boy/Male
Tamil
Constant
Boy/Male
Latin
Constant.
Male
French
French and Romanian form of Latin Constantinus, CONSTANTIN means "steadfast."Â
Male
Polish
Polish form of Latin Constans, KONSTANTY means "steadfast."
Boy/Male
Latin English
Constant.
Surname or Lastname
English and French
English and French : from the medieval female personal name Constance, Latin Constantia, originally a feminine form of Constantius (see Constant), but later taken as the abstract noun constantia ‘steadfastness’.English and French : habitational name from Coutances in La Manche, France, which was named Constantia in Latin (see above) in honor of the Roman emperor Constantius Chlorus, who was responsible for fortifying the settlement in ad 305.
Female
English
English form of Latin Constantia, CONSTANCE means "steadfast."Â
Girl/Female
British, English
Similar to Constance; Used by 16th and 17th Century Puritans
Surname or Lastname
French and English
French and English : from a medieval personal name (Latin Constans, genitive Constantis, meaning ‘steadfast’, ‘faithful’, present participle of the verb constare ‘stand fast’, ‘be consistent’). This was borne by an 8th-century Irish martyr. This surname has also absorbed some cases of surnames based on Constantius, a derivative of Constans, borne by a 2nd-century martyr, bishop of Perugia. Compare Constantine.English : perhaps also a nickname from Old French constant ‘steadfast’, ‘faithful’.
Girl/Female
Australian, German, Latin, Spanish, Swedish
Constancy; Steadfastness
Girl/Female
American, Australian, British, Christian, Dutch, English, French, German, Latin, Portuguese, Shakespearean, Swedish
Constancy; Steadfastness
Female
Romanian
Romanian form of Latin Constantia, CONSTANTA means "steadfast."
CONSTANT PROBLEM
CONSTANT PROBLEM
Female
French
French form of Latin Igerna, IGERNE means "maiden, virgin."Â
Male
Vietnamese
 Vietnamese name element QUAN means "soldier, warrior." Compare with another form of Quan.
Boy/Male
Hindu
Name of Lord Shiva
Boy/Male
Hindu, Indian, Marathi
Son
Boy/Male
Hindu
Sun of Vishva
Girl/Female
Arabic, Australian, French, Muslim
Silver Pearl
Boy/Male
American, German
Warrior of Mars; Roman War God; Mars; Hammerer
Surname or Lastname
English
English : habitational name from any of several places named Hambleton, Hambleden, or Hambledon, in particular Hambleton in Lancashire, which is named from Old English hamel ‘crooked (hill)’ + tūn ‘enclosure’, ‘settlement’.
Girl/Female
Greek
Resourcefulness.
Girl/Female
Biblical
Zeal, jealousy, possession.
CONSTANT PROBLEM
CONSTANT PROBLEM
CONSTANT PROBLEM
CONSTANT PROBLEM
CONSTANT PROBLEM
n.
A superior wine, white and red, from Constantia, in Cape Colony.
v. t.
Remaining unchanged or invariable, as a quantity, force, law, etc.
a.
harmonizing together; accordant; as, consonant tones, consonant chords.
a.
A day of the present or current month; as, the sixth instant; -- an elliptical expression equivalent to the sixth of the month instant, i. e., the current month. See Instant, a., 3.
n.
An expression of assent to a bill or motion; an affirmative vote; also, a member who votes "Content.".
n.
A constant irritating desire.
adv.
Constant; continual.
v. t.
Firm; solid; fixed; immovable; -- opposed to fluid.
n.
An invariable quantity; a constant.
n.
A quantity that does not change its value; -- used in countradistinction to variable.
adv.
With constancy; steadily; continually; perseveringly; without cessation; uniformly.
a.
Continued without intermission; perpetual; ceaseless; constant.
a.
Not constant; not stable or uniform; subject to change of character, appearance, opinion, inclination, or purpose, etc.; not firm; unsteady; fickle; changeable; variable; -- said of persons or things; as, inconstant in love or friendship.
n.
That which is not subject to change; that which is invariable.
n.
The quality or state of being inconstant; want of constancy; mutability; fickleness; variableness.
v. t.
Consistent; logical.
a.
Not constant; inconstant; fickle; changeable.
n.
The state or quality of being constant or steadfast; freedom from change; stability; fixedness; immutability; as, the constancy of God in his nature and attributes.
v. t.
Not liable, or given, to change; permanent; regular; continuous; continually recurring; steadfast; faithful; not fickle.
a.
Resolute; persevering; constant; steady.