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WHAT IS TIME
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What is Time?, Time is an emergent concept, Time, Nature of time, time dilation, length contraction, inertia, gravity, expansion of the universe, accelerating expansion, twin paradox, inertia, Einstein, singularity, black hole, speed of light,
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What is time? Time is an emergent concept, Time, Nature of time, What causes time? Why time slows in gravity? Why time slows with motion? Is time a dimension? Why Gravity is only attractive? Length contraction. Black holes, singularity Is universal expan
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<td nowrap height="35" align="center" valign="top"><span class="text"><b><i><span style="font-size:16px;line-height:19px;">WHAT IS TIME? WHAT CAUSES TIME?<br></span></i></b><b><i><font size="2"><span style="font-size:12px;line-height:15px;">mkhan@timephysics.com<br soft></span></font></i></b></span></td>
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<div id="e1" style="position:absolute;left:1;top:305;width:998;height:667;"><span class="text"><i><span style="font-size:16px;line-height:19px;">Writer and physicist Paul Davies has called "time" Einstein’s unfinished revolution. There are many questions about the nature of time. What <br soft>is time? What causes time? Why time slows in gravity? Why time slows in motion? Is time a dimension? Aristotle had speculated that time <br soft>may be motion. He however added that motion could be slower or faster but not time. Aristotle did not have the privilege of knowing about <br soft>Einstein’s relativity in which time also becomes amenable to change. Similarly when Einstein was working to develop theory of general <br soft>relativity and proposed the revolutionary idea that mass curves space he did not know that the universe was expanding. This discovery by <br soft>astronomer Edwin Hubble came 13 years after Einstein had published his theory of General Relativity. Had Einstein known of this great <br soft>discovery he may have incorporated these ideas into his theories. Conceptually it is easier to derive space curvature in an expanding <br soft>universe as an area of slower expansion under the influence of gravitons. One of the most dramatic aspects of the universe is that it is <br soft>expanding and the presence of motion, forces and curved space-time happens in the expanding space. <br><br>In the next few paragraphs I will show that </span></i><b><i><span style="font-size:16px;line-height:19px;">time is an emergent concept.</span></i></b><i><span style="font-size:16px;line-height:19px;"> There is an underlaying process of motion and forces from which <br soft>time emerges, however what we perceive as time is mostly an illusion. Our memory creates the illusion of the past. Conscious perception of <br soft>events gives the feeling of present. Future is a mental construct patterned on the memory experience of the past. Concept of time emerges <br soft>as our mind tries to make sense of the world around us which is filled with change.<br><br></span></i><b><i><span style="font-size:16px;line-height:19px;"> Mc TAGGART ON THE ILLUSION OF TIME<br><br></span></i></b><a href="mctaggart.html"><i><span style="font-size:16px;line-height:19px;"> John Ellis </span></i></a><a href="mctaggart.html"><i><span style="font-size:16px;line-height:19px;">McTaggart </span></i></a><i><span style="font-size:16px;line-height:19px;">(1908) and many other philosophers have proposed that the passage of time is an illusion suggesting that only the <br soft>present is real. McTaggart is famous for his A, B and C series analysis of time. A brief review is as follows:<br><br>The earlier and later aspect of time is basically the same as the arrow of time. The birth of a person always comes before their death even as <br soft>these events become part of the distant past. This is a fixed relationship so McTaggart asserts it must be more fundamental to time.<br><br>The past the present and the future aspect of time is constantly changing, future events are moving to the present and then into the past and <br soft>then further back into the past. This aspect deals with the feeling of flow of time. This constantly changing relationship is also essential to the <br soft>description of time. McTaggart felt that time is unreal because distinction of past present and future (a changing relationship) is more <br soft>essential to time then the fixed relationship of earlier and later.<br><br> </span></i><b><i><span style="font-size:16px;line-height:19px;"> TIME AS MEMORY<br><br>McTaggart's most interesting observation however is that historical events have same time characteristic as made up stories. </span></i></b><i><span style="font-size:16px;line-height:19px;">For <br soft>example made up stories, as well as past historical events have in them, the earlier and the later as well as the past the present and the <br soft>future, thus suggesting that past really is more like memory of events and does not exist any more than imagination of a writer. The above <br soft>point becomes more clear when we compare past present and future to other recording devices like laser discs CDs and hard drives.<br soft></span></i></span> </div>
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<td nowrap height="16" align="center" valign="top"><span class="text"><a href="what-causes-time.html"><i><font size="2"><span style="font-size:12px;line-height:15px;">WHAT CAUSES TIME?<br soft></span></font></i></a></span></td>
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<td nowrap height="20" align="center" valign="top"><span class="text"><a href="what-causes-time.html"><b><i><font size="2"><span style="font-size:12px;line-height:15px;">W</span></font></i></b></a><a href="what-causes-time.html"><b><i><font size="2"><span style="font-size:12px;line-height:15px;">HAT CAUSES TIME<br soft></span></font></i></b></a></span></td>
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<td nowrap height="46" align="center" valign="top"><span class="text"><b><i><font size="2"><span style="font-size:12px;line-height:15px;">More powerful than all the armies of the <br soft>world, is an idea whose time has come.<br> ........Victor Hugo<br soft></span></font></i></b></span></td>
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<div id="e8" style="position:absolute;left:431;top:70;width:150;height:130;"><!--$img %ImageAssetImpl:/images/clocks_85.jpg$--><img src="sitebuilder/images/clocks_85-150x130.jpg" width="150" height="130" alt=""></div> <div id="e9" style="position:absolute;left:402;top:1019;width:598;height:304;"><span class="text"><i><span style="font-size:16px;line-height:19px;"> </span></i><b><i><span style="font-size:16px;line-height:19px;">PRESENT IS AN INFINITESIMAL?<br><br></span></i></b><i><span style="font-size:16px;line-height:19px;">Present is the most real perception of time however almost all of what we perceive as <br soft>the present is already past. The present is a fleeting moment, whatever is <br soft>happening now (present) is confined to an </span></i><b><i><span style="font-size:16px;line-height:19px;">infinitesimally narrow point on the time <br soft>line</span></i></b><i><span style="font-size:16px;line-height:19px;"> which is being encroached upon by what we think of as the past and the future.<br><br></span></i><b><i><span style="font-size:16px;line-height:19px;">Present resembles the sharp point of a recording laser </span></i></b><i><span style="font-size:16px;line-height:19px;">or needle while past <br soft>being a duration or extension resembles the recorded material like tape or CD.<br><br>Present may be mental awareness of the recording of memory into our brain. A <br soft>person can go to an event but fall asleep and miss the event completely. So that <br soft>event basically does not exist in his past. Unless we are consciously aware of an <br soft>event it does not seem to enter our past memory.<br soft></span></i></span> </div>
<div id="e10" style="position:absolute;left:1;top:1032;width:391;height:280;"><!--$img %ImageAssetImpl:/images/PRESENT-infinitesimal.jpg$--><img src="sitebuilder/images/PRESENT-infinitesimal-391x280.jpg" width="391" height="280" alt=""></div> <div id="e11" style="position:absolute;left:1;top:1350;width:460;height:250;"><span class="text"><b><i><span style="font-size:16px;line-height:19px;"> PAST AND FUTURE ARE DURATIONS IN TIME<br><br></span></i></b><i><span style="font-size:16px;line-height:19px;">Unlike the present we see past and future as </span></i><b><i><span style="font-size:16px;line-height:19px;">measurable <br soft>durations</span></i></b><i><span style="font-size:16px;line-height:19px;"> of hour days months and years.<br><br>Past historical events, an upcoming meeting, wedding, or other <br soft>events are all measurable durations or extensions in time, just <br soft>like a recorded material on tape, video recordings, and tracks of <br soft>CD or DVD.<br><br>This similarity suggests that past is just a recorded memory, <br soft>while future is like an unrecorded tape. Future is a projection <br soft>created by our past experiences which are stored in our memory.<br soft></span></i></span> </div>
<div id="e12" style="position:absolute;left:472;top:1350;width:528;height:370;"><!--$img %ImageAssetImpl:/images/PAST_PRESENT_FUTURE42.jpg$--><img src="sitebuilder/images/PAST_PRESENT_FUTURE42-528x370.jpg" width="528" height="370" alt=""></div> <div id="e13" style="position:absolute;left:121;top:1610;width:200;height:100;"><!--$img %ImageAssetImpl:/images/film_roll.jpg$--><img src="sitebuilder/images/film_roll-200x100.jpg" width="200" height="100" alt=""></div> <div id="e14" style="position:absolute;left:1;top:1740;width:999;height:513;"><span class="text"><i><span style="font-size:16px;line-height:19px;"> </span></i><b><i><span style="font-size:16px;line-height:19px;">MEASURING TIME<br><br></span></i></b><i><span style="font-size:16px;line-height:19px;">Be it money, weight, a piece of estate, speed, distance or resistance. We measure by comparison to a standard that we have defined. When <br soft>we measure a mass we use a standard mass like KG or LB for comparison. Distances we measure using a standard of length like a meter <br soft>yard or feet. Keeping the above in mind let us think how we measure motion. </span></i><b><i><span style="font-size:16px;line-height:19px;">We use time to measure motion i.e. Feet per second or miles <br soft>per hour. </span></i></b><i><span style="font-size:16px;line-height:19px;">This provides a hint that when dealing with time we are actually dealing with some standard of motion.<br><br>We may have made the concept of time more complicated then what it really is. Measurement of time started early on in human <br soft>development. There are plenty of clues in every language in the greetings and the meetings. Time of the day is related to the position of sun <br soft>in the sky or its absence thereof. There is dawn, sunrise, early morning, morning, mid morning, noon, afternoon, late afternoon, evening, <br soft>sunset, dusk, night and mid night. Then there are years, months, weeks, based on earth’s yearly orbit around the sun and the changing <br soft>seasons. </span></i><b><i><span style="font-size:16px;line-height:19px;">The use of units like seconds and minutes which are radial angle measurements in geometry </span></i></b><i><span style="font-size:16px;line-height:19px;">points toward the original <br soft>connection of time measurements to radial motion of astronomical objects across the sky. Once we started using clocks, watches, and then <br soft>digital time we got completely disconnected from the original method of measurement and time developed a life of its own.<br><br>The problem of time may be easy to solve if we go back to the original concept of sun moving across the sky. When we measure the speed of <br soft>a car, we are just comparing its motion to the motion of the hands of the clock and also indirectly to the fractional motion of sun across the sky. <br soft>We are not measuring speed with something abstract called time we are just comparing a known motion (of the sun) with an unknown motion <br soft>of the car.<br><br> </span></i><b><i><span style="font-size:16px;line-height:19px;">TIME AS UNIT OF MOTION<br><br></span></i></b><i><span style="font-size:16px;line-height:19px;">In a recent article in </span></i><a href="http://www.scientificamerican.com/article.cfm?id=is-time-an-illusion"><i><span style="font-size:16px;line-height:19px;">Scientific</span></i></a><i><span style="font-size:16px;line-height:19px;"> American </span></i><a href="http://philosophy.ucsd.edu/faculty/ccallender/"><i><span style="font-size:16px;line-height:19px;">Craig Callender </span></i></a><i><span style="font-size:16px;line-height:19px;">elegantly compares time with a unit of motion. Time is a way to compare or describe <br soft>different kinds of motions like speed of light, how fast heart beats or how frequently earth spins around its axis. But these processes could be <br soft>compared directly without making reference to time. </span></i><b><i><span style="font-size:16px;line-height:19px;">Time may just be common currency or unit of motion </span></i></b><i><span style="font-size:16px;line-height:19px;">making the world easier to <br soft>describe but having no independent existence. Measuring processes (of motion) with time is like using money rather than barter transactions. <br soft>This again suggests that underlying mechanism of time is just presence of motion.<br soft></span></i></span> </div>
<div id="e15" style="position:absolute;left:21;top:2260;width:960;height:530;"><!--$img %ImageAssetImpl:/images/TIME_AS_CURRENCY2.jpg$--><img src="sitebuilder/images/TIME_AS_CURRENCY2-960x530.jpg" width="960" height="530" alt=""></div> <div id="e16" style="position:absolute;left:1;top:2800;width:999;height:171;"><span class="text"><b><i><span style="font-size:16px;line-height:19px;"> WHAT REALLY IS TIME?<br><br>Time is an emergent concept.</span></i></b><i><span style="font-size:16px;line-height:19px;"> There is a real phenomenon a continuous change through which we live. To understand time we have to <br soft>understand the mechanism which brings about this continuous change from which our mind creates the illusion of flow of time.<br><br>Time becomes evident through motion and is measured by comparison with other motions. Sunrise sunsets, night and day, the changing <br soft>seasons, the movement of the celestial bodies are all indicative of continuous change. The aging process is a reminder that molecular <br soft>motion and interactions are also at work and are a part of time. Other very important aspect of time is presence of motion of particles like <br soft>photon and motion at atomic level.<br soft></span></i></span> </div>
<div id="e17" style="position:absolute;left:371;top:2990;width:629;height:551;"><span class="text"><b><i><span style="font-size:16px;line-height:19px;"> A THOUGHT EXPERIMENT<br><br></span></i></b><i><span style="font-size:16px;line-height:19px;">Imagine two objects one moving in orbit around the other in space. Now suppose from <br soft>our distant observation point of a fixed time we observe time to get slower in the area <br soft>where these two objects are moving. We expect to see slower motion? We also should <br soft>observe proportionally weaker gravitational force; otherwise the objects will get pulled <br soft>together. If we observed faster time, we expect to see faster motion and stronger gravity to <br soft>keep the objects from flying apart. While with zero time motion will freeze and gravity will <br soft>become zero.<br><br>The increase or decrease in strength of gravity is only in relation to our fixed time from <br soft>where we are making the observation. From the point of view (time) of the orbiting objects <br soft>neither motion nor gravity has changed. As this thought experiment also can be <br soft>extended to particles held together by electromagnetic forces </span></i><b><i><span style="font-size:16px;line-height:19px;">we can say that time <br soft>involves both motion and forces.<br><br> POSSIBLE DEFINITION OF TIME<br><br>Time can be defined from many perspectives. From perception view point time is <br soft>an emergent concept which our mind creates. Present is the consciousness or <br soft>awareness of recording of memory into the brain. Past is just a record while future <br soft>does not exist. From point of view of physics time is presence of motion and forces <br soft>in the universe.<br><br></span></i></b><i><span style="font-size:16px;line-height:19px;">Time involves all kinds of motion. The spin of particles and the motion of photons are <br soft>time dependent. Gravitational force and electromagnetic forces are all part of time. As is <br soft>the motion of celestial bodies the atoms and all other motion. We have partially <br soft>understood the phenomenon of time. </span></i><b><i><span style="font-size:16px;line-height:19px;">The next step is to find out what is the source of <br soft>this motion and forces.<br soft></span></i></b></span> </div>
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<td nowrap height="61" align="center" valign="top"><span class="text"><b><i><font size="2"><span style="font-size:12px;line-height:15px;">Rotating buckets and twin <br soft>paradox reveal the <br soft>significance of motion <br soft>through space<br soft></span></font></i></b></span></td>
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<td nowrap height="20" align="center" valign="top"><span class="text"><b><i><font size="2"><span style="font-size:12px;line-height:15px;">Moving objects also curve space<br soft></span></font></i></b></span></td>
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